Name: International Conference on Exotic Atoms and Related Topics and conference on Low Energy Antiprotons (EXA/LEAP 2024)
Start: 2024-08-25T08:00:00+02:00
End: 2024-08-30T18:00:00+02:00
Location: Vienna

International Conference on Exotic Atoms and Related Topics and conference on Low Energy Antiprotons (EXA/LEAP 2024)

from Sunday 25 August 2024 (08:00) to Friday 30 August 2024 (18:00)

Monday 19 August 2024
Tuesday 20 August 2024
Wednesday 21 August 2024
Thursday 22 August 2024
Friday 23 August 2024
Saturday 24 August 2024
Sunday 25 August 2024

16:00 Welcome event - The event will take place in the inner courtyard of a "Campus Academy" building of the Austrian Academy of Sciences. Come to the Doktor-Ignaz-Seipel-Platz in 1010 Vienna where we will put up signs to guide you to the right place.
Welcome event - The event will take place in the inner courtyard of a "Campus Academy" building of the Austrian Academy of Sciences. Come to the Doktor-Ignaz-Seipel-Platz in 1010 Vienna where we will put up signs to guide you to the right place.
16:00 - 19:00
Room: CAMPUS ACADEMY

Monday 26 August 2024

08:30 Registration
Registration
08:30 - 09:00
Room: Clubraum
09:00 Welcome - Eberhard Widmann (Austrian Academy of Sciences (AT))
Welcome
- Eberhard Widmann (Austrian Academy of Sciences (AT))
09:00 - 09:20
Room: Festsaal
09:20 Announcement: discussion session on Thursday - Claude Amsler (Austrian Academy of Sciences (AT))
Announcement: discussion session on Thursday
- Claude Amsler (Austrian Academy of Sciences (AT))
09:20 - 09:30
Room: Festsaal
09:30 Future Perspectives of AD-ELENA Facility at CERN - Davide Gamba (CERN)
Future Perspectives of AD-ELENA Facility at CERN
- Davide Gamba (CERN)
09:30 - 10:00
Room: Festsaal The Antimatter Factory at CERN focuses on producing low-energy antiprotons for high-precision antimatter experiments. It comprises the Antiproton Decelerator (AD), which is an adaptation of the '80s Antiproton Collector (AC), and the recently commissioned Extra Low ENergy Antiproton ring (ELENA), which became fully operational in 2021. Initially, the AD could support only a single experiment at a time, typically in eight-hour shifts, delivering approximately 3e7 antiprotons at 5.3 MeV with a two-minute repetition period. Currently, with the integration of ELENA, the facility can supply four bunches of 1e7 antiprotons each at 100 keV, maintaining the same repetition period, and is capable of serving up to four experiments simultaneously or more in a sequential round-robin arrangement. The introduction of ELENA has significantly enhanced performance, suggesting new possibilities for low-energy antimatter physics research. This progress, along with the increasing complexity of the facility, calls for a thorough review of its consolidation strategy to ensure its longevity. Moreover, it presents an opportunity to contemplate future upgrades to meet the evolving demands of the scientific community. This presentation will detail the present performance and will explore feasible upgrade options for the current facility.
10:00 Pontecorvo process - Luca Venturelli (Universita di Brescia (IT))
Pontecorvo process
- Luca Venturelli (Universita di Brescia (IT))
10:00 - 10:30
Room: Festsaal
10:30 Pause
Pause
10:30 - 11:00
Room: Aula
11:00 PUMA - Probing the surface of atomic nuclei with antiprotons - Frank Wienholtz (TU Darmstadt)
PUMA - Probing the surface of atomic nuclei with antiprotons
- Frank Wienholtz (TU Darmstadt)
11:00 - 11:30
Room: Festsaal The main goal of the PUMA [1] (antiProton Unstable Matter Annihilation) experiment is to use antiprotons as a tool to investigate the matter density of short-lived nuclei. For this, antiprotons produced at the Antiproton Decelerator (AD) facility at CERN and decelerated by the Extra Low Energy Antiproton storage ring (ELENA) will be captured, cooled and transported to the ISODLE facility at CERN where the antiprotons will be mixed with short lived isotopes. During this process, an antiproton can be captured by the nucleus and will subsequently annihilate with a neutron or a proton at the surface of the nucleus itself. The pionic fingerprint of this annihilation will be measured using a time-projection-chamber. With this knowledge, the ratio of protons to neutrons on the outermost part of the nuclei distribution can be determined and phenomena like neutron or proton halos or neutron or proton skins can be investigated. An overview of the PUMA experiment will be given, the current status will be discussed and some of the main physics goals will be highlighted. [1] Aumann et al., Eur. Phys. J. A (2022) 58: 88
11:30 Searching for a dark matter particle with anti-protonic atoms - Georgy Kornakov (Warsaw University of Technology (PL))
Searching for a dark matter particle with anti-protonic atoms
- Georgy Kornakov (Warsaw University of Technology (PL))
11:30 - 12:00
Room: Festsaal Candidates for dark matter are proposed and searched from the sub meV to TeV scales. The indirect observations don’t provide sufficient power to constrain to a narrow parameter space of the searches. One of the dark matter candidates, a deeply bound (uuddss) sexaquark, S, with mass in the GeV range is hypothesized to be long lived and very compact, described within the Standard Model of Particle Physics without extensions. S properties make it particularly challenging to explore experimentally. In this contribution we will show an experimental scheme [1] in which S could be produced at rest through the formation of helium-3 antiprotonic atoms and their subsequent annihilation into S +K^+K^+ + pi^-. This channel is particularly clean as there is no other channel naturally populating the same final state. It can be uniquely identified both through the unique tag of a S=+2, Q=+1 final state, as well as through full kinematic reconstruction of the final state recoiling against it. [1] M. Doser, G. Farrar, G. Kornakov, “Searching for a dark matter particle with anti-protonic atoms”, Eur.Phys.J.C 83 (2023) 12, 1149, arXiv:2302.00759 [hep-ph]
12:00 Antiproton annihilation on nuclei - Angela Gligorova (University of Vienna (AT))
Antiproton annihilation on nuclei
- Angela Gligorova (University of Vienna (AT))
12:00 - 12:30
Room: Festsaal The annihilation of antiprotons is a fundamental process that still lacks a precise description. When the annihilation involves a nucleus, the initially produced pions can trigger various secondary reactions with differing probabilities, significantly increasing the complexity of the interaction. Despite previous extensive experimental and theoretical efforts, existing models are, to varying degrees, inefficient in fully reproducing all aspects of the annihilation mechanism. The antiproton nucleus reactions at rest are particularly relevant to experiments at CERN's Antiproton Decelerator, designed for atomic physics studies and high-precision tests of fundamental symmetries, where antimatter is primarily detected through its annihilation. In this talk, I will present results from recent measurements of antiproton-nucleus annihilation at rest conducted at the ASACUSA experiment at CERN, using 150 eV slow extracted antiprotons and thin solid targets made of carbon, molybdenum and gold. The multiplicity of minimum ionizing particles and heavy prongs, as well as their energy deposits, will be compared with simulation models from Geant4 and FLUKA, discussing the limitations of each. Additionally, I will introduce a novel project focused on a detailed, systematic study of charged fragment production in antiproton-induced reactions across different nuclei at very low incident energies. This project, currently in preparation, aims at an in-depth investigation of final state interactions and their evolution with atomic number, while simultaneously providing benchmarks and a foundation for refining simulation models.
12:30 Break
Break
12:30 - 14:00
14:00 Antimatter-Nucleus reactions with the Liège IntraNuclear Cascade (INCL) code - Jean-Christophe David
Antimatter-Nucleus reactions with the Liège IntraNuclear Cascade (INCL) code
- Jean-Christophe David
14:00 - 14:30
Room: Festsaal The INCL intranuclear cascade code has been developed and used for a long time. Its aim is to simulate the interactions of light projectiles with all types of nuclei in an energy range from a few tens of MeV to 10-20 GeV. To do this, it has to be combined with a de-excitation code, and most of the time it is the ABLA code that is used. Both codes are also available in the Geant4 particle transport code. In addition, different versions of INCL are available in other codes (e.g. Phits, Genie). The latest innovation in INCL is the ability to simulate antiproton-nucleus reactions, from at-rest to around 10 GeV. This is the subject that will be presented here, along with the way in which the implementations were made (hypotheses, ingredients) and the results that were obtained (comparisons with experimental data, and sometimes with other models). As the antineutron is currently being implemented, this subject could also be addressed. The next step will be to extend this to anti-deuterons, anti-tritons, etc.
14:30 Measurement of anti-3He nuclei absorption in matter and impact on their propagation in the Galaxy - Laura Šerkšnytė (Technische Universitaet Muenchen (DE))
Measurement of anti-3He nuclei absorption in matter and impact on their propagation in the Galaxy
- Laura Šerkšnytė (Technische Universitaet Muenchen (DE))
14:30 - 15:00
Room: Festsaal
15:00 Cosmic Antiparticles: Latest Results from the Alpha Magnetic Spectrometer on the International Space Station - Zhili Weng (Massachusetts Inst. of Technology (US))
Cosmic Antiparticles: Latest Results from the Alpha Magnetic Spectrometer on the International Space Station
- Zhili Weng (Massachusetts Inst. of Technology (US))
15:00 - 15:30
Room: Festsaal The Alpha Magnetic Spectrometer (AMS) is a precision particle physics detector on the International Space Station. Over 12 years, AMS has collected more than 230 billion cosmic rays, from elementary particles to iron nuclei, at energies up to multi-TeV. The precision spectrometer measures elementary particles and nuclei to ~1% accuracy, yielding many surprising results. The latest AMS results will be presented with a particular emphasis on elementary particles and antiparticles (protons, electrons, positrons, and antiprotons). These data reveal unexpected properties in cosmic rays and indicate new sources of high-energy antiparticles. The AMS results continue to provide unique insights into understanding the origin of dark matter and antimatter, and exploring new physics phenomena in the cosmos.
15:30 Pause
Pause
15:30 - 16:00
Room: Aula
16:00 Positron Annihilation in the Universe - Thomas Siegert (JMU Würzburg)
Positron Annihilation in the Universe
- Thomas Siegert (JMU Würzburg)
16:00 - 16:30
Room: Festsaal One of the major tasks of astrophysics is to understand the emission mechanisms of observed sources and regions in the sky. Only by pinpointing down these mechanisms, it is possible to derive physical parameters and learn about the evolution of astrophysical objects. Alas, many observations of high-energy phenomena are ambiguous, requiring more and orthogonal information. The nature of several sources, among others accreting X-ray binary systems, core-collapse and thermonuclear supernovae, cosmic-rays, stellar flares and potentially dark matter, all show signatures of positron production and annihilation. Utilising this underrated emission mechanism can shed light on unsolved problems in astrophysics and cosmology. In this talk, I will show examples of how we can learn from these gamma-ray signatures already now with ESA's INTEGRAL observatory, and what might be possible in the context of new gamma-ray satellite missions, such as the accepted NASA mission COSI.
16:30 Precision studies of ortho-positronium decay rate with J-PET - Sushil Sharma (Faculty of Physics, Astronomy, and Applied Computer Science, Jagiellonian University, Poland; Total-Body Jagiellonian-PET Laboratory, Jagiellonian University, Poland; Center for Theranostics, Jagiellonian University, Poland)
Precision studies of ortho-positronium decay rate with J-PET
- Sushil Sharma (Faculty of Physics, Astronomy, and Applied Computer Science, Jagiellonian University, Poland; Total-Body Jagiellonian-PET Laboratory, Jagiellonian University, Poland; Center for Theranostics, Jagiellonian University, Poland)
16:30 - 17:00
Room: Festsaal Positronium atom (Ps), a fascinating purely leptonic system, serves as an excellent testbed for probing quantum electrodynamics (QED) in the bound state [1, 2]. Ps can manifest in one of two states, depending on the total spin number (S): a short-lived state with spin zero (para-Ps) and long-lived meta stable state with spin one (ortho-Ps). Prior to 1995, a significant discrepancy existed between experimentally measured and QED-predicted lifetimes values, termed as the ortho-Ps lifetime puzzle, which was later attributed to pickoff annihilations occurring during the thermalization process [3, 4]. Several groups have experimentally estimated the ortho-Ps decay rate in vacuum, yielding the most precise value of 𝜆$_{3𝛾}$ = 7.0401 ± 0.0007 μs$^{−1}$ [5]. However, this remains two orders of magnitude less precise than the theoretical prediction [6, 7]. This study proposes a novel methodology for estimating the ortho-Ps decay constant by measuring the 3$\gamma$ and 2$\gamma$ decay rates as a function of time utilizing J-PET, a multimodule detector capable of simultaneous multiphoton registration [8-10]. The primary aim of this investigation is to significantly improve the accuracy of determining the decay rate of ortho-Ps compared to previous measurements. The forthcoming presentation will emphasize the adapted analysis algorithm and highlight the results, which have already shown a precision that is an order of magnitude better than the best value measured so far. **References** [1] S.D. Bass, S. Mariazzi, P. Moskal and E. Stepien, *Rev. Mod. Phy.* **95**, 021002 (2023) [2] P. Moskal et al., *Acta Phys. Polon. B* **47**, 509 (2016) [3] R.S. Vallery, P.W. Zitzewitz and D.W. Gidley, *Phys. Rev. Lett.* **90**, 203402 (2003) [4] S. Asai, S. Orito and N. Shinohara, *Phys. Lett. B* **357**, 475-480 (1995) [5] Y. Kataoka, S. Asai, T. Kobayashi, *Phys. Lett. B* **671**, 219-223 (2009) [6] A. Ore and J.L Powell, *Phys. Rev.* **75**, 1696 (1949) [7] G. S. Adkins, *Ann. Phys. (New York)* **146**, 78 (1983) [8] P. Moskal et al., *Science Advances* **7**, eabh4394 (2021) [9] P. Moskal et al., *Nature Comm.* **12**, 5658 (2021) [10] P. Moskal et al., *Nature Comm.* **15**, 78 (2024)
17:00 Precision laser spectroscopy of the Thorium-229 nuclear clock transition - Thorsten Schumm (T)
Precision laser spectroscopy of the Thorium-229 nuclear clock transition
- Thorsten Schumm (T)
17:00 - 17:30
Room: Festsaal We demonstrate the first laser excitation of an atomic nucleus and perform precision spectroscopy of the nuclear quadrupole structure emerging in a solid-state environment. This allows us to determine nuclear shape parameters with unprecedented accuracy and determine the sensitivity of the nuclear clock transition to a variation of the fine structure constant.
Tuesday 27 August 2024

08:30 Registration
Registration
08:30 - 09:00
Room: Clubraum
09:00 Measurement of the C-forbidden $2\,^3$S$_1 \rightarrow 2\,^1$P$_1$ transition in positronium - Rebecca J Daly (University College London)
Measurement of the C-forbidden $2\,^3$S$_1 \rightarrow 2\,^1$P$_1$ transition in positronium
- Rebecca J Daly (University College London)
09:00 - 09:30
Room: Festsaal We report the results of a new measurement of the $2\,^3$S$_1 \rightarrow 2\,^1$P$_1$ transition ($\nu_F$) in positronium (Ps). Though this transition is forbidden by charge conjugation symmetry (C), it can be observed in a magnetic field. We optically excite Ps from a pulsed beam to produce radiatively metastable $2\,^3$S$_1$ atoms and drive them to the $2\,^3$P$_1$ level in a rectangular waveguide using microwave radiation. The C-allowed $2\,^3$S$_1 \rightarrow 2\,^3$P$_1$ transition ($\nu_1$) was also measured in the same waveguide, using the same techniques, and the observed Zeeman shift was used to determine the local magnetic field strength. The measurements were performed in a range of magnetic fields, making it possible to determine the field-free $\nu_1$ and $\nu_F$ transition frequencies, and to set limits on the C-forbidden transition matrix element |$\langle 2\,^1$P$_1|H_{{C}P} | 2\,^3$P$_1 \rangle$|
09:30 Demonstration of one-dimensional chirp cooling of positronium to ultra-low temperatures - Kenji Shu (University of Tokyo)
Demonstration of one-dimensional chirp cooling of positronium to ultra-low temperatures
- Kenji Shu (University of Tokyo)
09:30 - 10:00
Room: Festsaal Positronium (Ps), an exotic atom composed of an electron and its antiparticle, the positron, serves as an excellent system for fundamental physics investigations. Its unique composition of light leptons makes it an ideal system for testing Quantum Electrodynamics (QED) and probing physics beyond the Standard Model. A key aspect of such studies involves comparing calculated energy intervals with precise measurements, often achieved through laser spectroscopy. Because of the current situation that measured precision is inferior to that of theory, breakthroughs on experimental side are required; one of which is Ps cooling for both precision and accuracy. In the presentation, we will report the demonstration of one-dimensional chirp cooling of Ps [1]. By subjecting Ps to an optimized laser system developed in our laboratory [2], we achieved an unprecedentedly low temperature of approximately 1 K. This temperature is two orders of magnitude colder than what conventional cooling methods can achieve. The laser system was designed to maximize the number of Ps atoms with zero velocity along the cooling axis. Numerical simulations, rigorously modeling the Ps-laser interaction, allowed us to reasonably reproduce the resulting velocity distribution after laser cooling. We will also discuss about improvements for cooling the majority of Ps atoms thermally emitted [3], three-dimensional laser cooling, and prospects for precision spectroscopy powered by laser-cooled Ps. References [1] K. Shu et al., arXiv:2310.08761. [2] K. Shu et al., Phys. Rev. A 109, 043520 (2024).. [3] L. T. Glöggler et al. (AEḡIS Collaboration), Phys. Rev. Lett. 132, 083402 (2024).
10:00 Prospects for Positronium Bose-Einstein Condensation - Akira Ishida (The University of Tokyo)
Prospects for Positronium Bose-Einstein Condensation
- Akira Ishida (The University of Tokyo)
10:00 - 10:30
Room: Festsaal Positronium (Ps), the bound state of an electron and its antiparticle positron, serves as a good probe for fundamental physics. As the lightest purely leptonic atom containing an antiparticle, Ps offers unique opportunities for precision tests of bound-state quantum electrodynamics (QED) and investigations into matter-antimatter asymmetry—the mystery underlying our matter-dominated Universe. One of the long-standing goals in Ps research is the realization of Bose-Einstein Condensation (BEC) of Ps (Ps-BEC). Given its low mass, Ps stands out as an excellent candidate for achieving the first BEC containing antiparticles. Ps-BEC would allow us to study gravitational effects on antiparticles (specifically positrons) through interferometer experiments [1]. Additionally, it holds interesting potential for creating a 511-keV gamma-ray laser [2]. The challenge in achieving Ps-BEC is to satisfy stringent conditions: a high number density (on the order of $10^{18}$ cm$^{-3}$) and ultra-cold temperatures (below 10 K) within the short Ps annihilation lifetime of 142 ns. In this presentation, I will introduce the physics of Ps-BEC and provide an overview of our recent progress and future developments in creating dense and cold Ps using a recently proposed method [3]. This work was partially supported by JST FOREST Program (Grant Number JPMJFR202L), JSPS KAKENHI Grant Numbers JP16H04526, JP17H02820, JP17H06205, JP17J03691, JP18H03855, JP19H01923, MATSUO FOUNDATION, Mitutoyo Association for Science and Technology (MAST), Research Foundation for Opto-Science and Technology, The Mitsubishi Foundation, TIA Kakehashi TK17-046, TK19-016. [1] D. B. Cassidy and A. P. Mills, Jr., phys. stat. sol. (c) 4, 3419 (2007). [2] H. K. Avetissian et al., Phys. Rev. Lett. 113, 023904 (2014); Phys. Rev. A 92, 023820 (2015). [3] K. Shu et al., J. Phys. B: At. Mol. Opt. Phys. 49, 104001 (2016); A. Ishida et al., JJAP Conf. Proc. 7, 011001 (2018).
10:30 Pause
Pause
10:30 - 11:00
Room: Aula
11:00 Antiprotonic helium - Masaki Hori (Imperial College London)
Antiprotonic helium
- Masaki Hori (Imperial College London)
11:00 - 11:30
Room: Festsaal
11:30 X-rays of muonic and antiprotonic atoms - Nancy Paul (Laboratoire Kastler Brossel)
X-rays of muonic and antiprotonic atoms
- Nancy Paul (Laboratoire Kastler Brossel)
11:30 - 12:00
Room: Festsaal
12:00 Muonic Helium Hyperfine Structure Measurements at J-PARC MUSE - Patrick Strasser (KEK)
Muonic Helium Hyperfine Structure Measurements at J-PARC MUSE
- Patrick Strasser (KEK)
12:00 - 12:30
Room: Festsaal Muonic helium is a hydrogen-like atom composed of a helium atom with one of its two electrons replaced by a negative muon. Its ground-state hyperfine structure (HFS), which results from the interaction of the negative muon magnetic moment and the remaining electron, is very similar to muonium HFS but inverted. Precise measurements of the muonium ground-state HFS interval using a microwave magnetic resonance technique are now in progress at J-PARC by the MuSEUM collaboration [1]. The same method can be used to precisely determine the muonic helium HFS and the negative muon magnetic moment and mass. The world's most intense pulsed negative muon beam at J-PARC Muon Science Facility (MUSE) allows improving previous measurements and testing further CPT invariance by comparing the magnetic moments and masses of positive and negative muons (second-generation leptons). Moreover, a more precise determination of the muonic helium atom HFS will be beneficial to test and improve the theory of the three-body atomic system. Already, new precise measurements of the muonic helium HFS were performed at zero magnetic field using the high-intensity pulsed negative muon beam at MUSE D-line. Our new result is more precise than both previous measurements at weak and high fields [2,3] done 40 years ago and the first one performed with CH4 admixture (previously Xe) as an electron donor to form neutral muonic helium atoms [4]. High-field measurements are now in preparation at MUSE H-line, using ten times more muon beam intensity than at the D-line, and with decay electrons being more focused on the detector due to the high magnetic field, we aim at improving the accuracy of previous measurements nearly hundred times for muonic helium HFS. Furthermore, a new experimental approach to recover the negative muon polarization lost during the muon cascade process in helium is being investigated by repolarizing muonic helium atoms using a spin-exchange optical pumping (SEOP) technique [5], which would drastically improve the measurement accuracy, and where a direct improvement by a factor of ten may be realized. The first laser repolarization experiments were recently performed. An overview of the different features of these new muonic helium atom HFS measurements and the latest results will be presented. References: [1] S. Kanda *et al.*, Phys. Lett. B **815**, 136154 (2021) [2] H. Orth *et al.*, Phys. Rev. Lett. **45**, 1483 (1980) [3] C. J. Gardner *et al.*, Phys. Rev. Lett. **48**, 1168 (1982) [4] P. Strasser *et al.*, Phys. Lett. **131**, 253003 (2023) [5] A. S. Barton *et al.*, Phys. Rev. Lett. **70**, 758 (1993)
12:30 Break
Break
12:30 - 14:00
14:00 Parallel A
Parallel A
14:00 - 17:20
Room: Sitzungssaal
Contributions

14:00 Towards Lamb shift spectroscopy of antihydrogen atoms at the GBAR beam line - T. A. Tanaka (Institute of Physics, The University of Tokyo)

14:25 Towards a direct hydrogen-antihydrogen comparison - Steve Jones

14:50 Synthesis of highly charged nuclear fragments in a Penning-Malmberg trap using antiprotons - Fredrik Olof Andre Parnefjord Gustafsson (CERN)

15:15 Positronium Doppler laser cooling: results and perspectives - Antoine Camper (University of Oslo (NO))

16:05 Design and characterisation of an antiproton deceleration beamline for the PUMA experiment - Jonas Ludwig Fischer (TU Darmstadt)

16:30 Towards a transportable antiproton reservoir - Christian Smorra (Heinrich Heine University Dusseldorf (DE))

16:55 An antiproton trap system using a drift tube accelerator and energy degrader - Naofumi Kuroda (University of Tokyo (JP))
Parallel B
Parallel B
14:00 - 17:20
Room: Johannessaal
Contributions

14:00 Development of a Pressurized Helium Scintillating Calorimeter for AntiMatter Identification. - Francesco Nozzoli (Universita degli Studi di Trento and INFN-TIFPA (IT))

14:25 The neutron-antineutron oscillation and low-energy antinucleon-nucleus interactions - Takashi Higuchi (KURNS, Kyoto University)

14:50 Chiral symmetry restoration deduced in precision spectroscopy of pionic atoms - Kenta Itahashi (RIKEN)

15:15 Spectroscopy of $\eta$'-mesic nuclei with 12C(p,dp) reaction at GSI/FAIR - Yoshiki Tanaka (RIKEN)

16:05 Cosmic $\overline{\textrm{d}}$ and $\overline{\textrm{He}}$: production mechanisms and latest constraints from ALICE at the LHC - Giovanni Malfattore (University & INFN, Bologna (IT))

16:30 Formation of light (anti)deuteron from a coalescence afterburner - Nicolo Jacazio (Universita e INFN, Bologna (IT))

16:55 Hypernuclei Production through Antiprotonic Atoms - Moritz Schlaich (Technische Universitaet Darmstadt (DE))
17:30 Poster
Poster
17:30 - 19:30
Room: Aula
Contributions

17:30 Optical potential analysis of antiproton-nucleus data at low energy - Stefano Migliorati (Universita di Brescia (IT))

17:30 A novel platform for antiprotonic atom research using Paul and Penning-Malmberg traps - Malgorzata Grosbart (CERN)

17:30 Results from the Accelerators Validating Antimatter physics (AVA) network - Carsten Peter Welsch (Cockcroft Institute / University of Liverpool)

17:30 The Lepton Symmetry Experiment: LSym - Sangeetha Sasidharan (Max-Planck-Institut für Kernphysik, Heidelberg, Germany)

17:30 A new concept of Mu-antiMu conversion search - Naritoshi Kawamura

17:30 Towards laser cooling of negative molecular ions - Matthias Germann (CERN)

17:30 3D Simulation studies of mixed plasma confinement at AEgIS - Bharat Singh Rawat (University of Liverpool / Cockcroft Institute)

17:30 The scintillating bar detector of the ASACUSA experiment - Valerio Mascagna (Universita di Brescia (IT))

17:30 Production of exotic onium states and atoms in photon-photon collisions at hadron colliders - Karen Kang (Boston University (US))

17:30 Interferometer for the LEMING experiment - Robert Waddy

17:30 Experimental Investigation of QED Effects through Antiprotonic Atom X-ray spectroscopy: first test beams with TES detectors and solid targets - Quentin Senetaire (Laboratoire Kastler Brossel (FR))

17:30 Prospects for forward emitted positronium from nanoporous membranes - Benjamin Rienacker (University of Liverpool (GB))

17:30 Detecting eV electrons at sub-kelvin temperatures for the LEMING experiment - Damian Goeldi

17:30 Background Rejection for the ALPHA-g Anti-Hydrogen Detectors - Gareth Smith (TRIUMF (CA))

17:30 A cyclotron trap for antiprotonic atom x-ray spectroscopy in gaseous targets - Gonçalo Baptista

17:30 Multi-Photon decays of positronium with J-PET - Pooja Tanty

17:30 Analysis results of the search for neutron to mirror-neutron oscillations at PSI - Nathalie Ziehl

17:30 Mirror Matter in Positronium Decay Searches with the J-PET Detector - Justyna Mędrala-Sowa (Wydział Fizyki, Astronomii i Informatyki Stosowanej, Uniwersytet Jagielloński, Kraków)

17:30 Exploring the Polarization Correlation of Photons Emitted from Positron Annihilation in a Porous Medium - Deepak Kumar (Jagiellonian University)

17:30 Prospects for improving the sensitivity of CPT symmetry test in positronium decays with J-PET - Neha Chug (Jagiellonian University)

17:30 Antiproton-induced nuclear fragmentation - Jakub Zielinski (Warsaw University of Technology (PL))

17:30 Formation of moving exotic muonium atoms during channeling of antimuons in carbon nanotubes under external electromagnetic radiation - Nikolay Maksyuta (Taras Shevchenko National University of Kyiv, Ukraine)

17:30 Design and developing status of the data acquisition and the slow control systems in the M2e experiment at Fermilab - Antonio Gioiosa (University of Molise & INFN Roma Tor Vergata)

17:30 Muonic atoms reveal the structure of deformed nuclei - Denis Jankovic (Institut de Physique et Chimie des Materiaux de Strasbourg (FR) / Karlsruhe Institute of Technology (DE))

17:30 Prospects from a cold antideuteron beam in AD/ELENA - Ruggero Caravita (Universita degli Studi di Trento and INFN (IT))

17:30 The ground state hyperfine splitting in muonic hydrogen (Hyper-mu) experiment at PSI - Ahmed Ouf (johannes gutenberg universität mainz)

17:30 Ultracold neutron sources for fundamental physics — status at TRIUMF and future prospects - Takashi Higuchi (KURNS, Kyoto University)

17:30 Towards g-factor measurements of (anti-)protons using techniques based on quantum logic spectroscopy - Nikita Poljakov (Institut für Quantenoptik, Leibniz Universität Hannover)

17:30 Towards a Rydberg Interferometer to test the Weak Equivalence Principle with Positronium - Andreas Lanz (UCL - Department of Physics and Astronomy)

17:30 Rabi-oscillation spectroscopy : high precision time-domain analysis applied to muonium hyperfine resonance - Hiroyuki Torii (University of Tokyo (JP))

17:30 Lifetime measurements of light hypernuclei using K^- beam at J-PARC - Tadashi Hashimoto (RIKEN)

17:30 Study of Low Energy Antiproton Annihilations on Nuclei - Viktoria Kraxberger (Austrian Academy of Sciences (AT))

17:30 GRASIAN: Shaping and characterization of the cold hydrogen beam for the forthcoming first demonstration of gravitational quantum states of atoms - Carina Killian (Austrian Academy of Sciences (AT))

17:30 On the formation of molecules containing positronium - Alina Weiser (Austrian Academy of Sciences (AT))
Wednesday 28 August 2024

08:30 Registration
Registration
08:30 - 09:00
Room: Clubraum
09:00 Physics with Antiprotons and Antihydrogen - theory overview - Ralf Lehnert
Physics with Antiprotons and Antihydrogen - theory overview
- Ralf Lehnert
09:00 - 09:30
Room: Festsaal
09:30 Frequency metrology with antimatter - Janko Nauta (CERN)
Frequency metrology with antimatter
- Janko Nauta (CERN)
09:30 - 10:00
Room: Festsaal According to the fundamental symmetries that underpin the Standard Model, both matter and antimatter should have been produced in equal quantities at the Big Bang. The absence of antimatter in our Universe as we observe it today, strongly motivates direct matter-antimatter comparisons, where any observed difference would lead to new physics. The Antihydrogen Laser Physics Apparatus (ALPHA) collaboration at CERN produces and traps antihydrogen atoms by combining antiproton and positron plasmas, which are subsequently used for precise studies. Recent progress includes the accumulation of thousands of atoms, direct laser cooling of the antihydrogen sample [1] and the first observation of the motion of antihydrogen in a gravitational field [2]. Laser spectroscopy of antihydrogen has already resulted in a test of CPT symmetry to a relative precision of 2 × 10−12 [4]. In hydrogen however, the same spectral feature, the 1S-2S transition, has been determined up to a precision of 4 × 10−15 [5]. To enable matter-antimatter comparisons at that level, we have implemented a Cs fountain clock in collaboration with NPL [3]. The fountain acts as a local absolute frequency reference and is used to steer an active hydrogen maser in the same laboratory. In addition to comparing the frequency of the maser with our fountain, we also cross-check against national metrology labs via satellite frequency transfers. A frequency comb and a stabilized fiber link, as well as two ultra-low expansion cavities, then allow for accurate determination of the laser frequency that is experienced by the antihydrogen atoms. I will present recent progress and the current status towards a more precise comparison of the 1S2S transition in hydrogen and antihydrogen. I will also detail how we plan to access fundamental quantities, such as the Rydberg constant in an antimatter system and the antiproton radius, by carrying out laser spectroscopy on higher-lying excited states in antihydrogen. References [1] C. J. Baker et al., Nature 592, 35 (2021) [2] E. Anderson et al., Nature 716, 621 (2023) [3] R. J. Hendricks, F. Ozimek, K. Szymaniec, B. Nag´orny, P. Dunst, J. Nawrocki, S. Beattie, B. Jian, and K. Gibble, IEEE Trans. Ultrason. 66 624 (2019) [4] M. B. Ahmadi et al., Nature 557 71 (2018) [5] C. G. Parthey, A Matveev, J. Alnis, B. Bernhardt, A. Beyer, R. Holzwarth, A. Maistrou, R. Pohl, K. Predehl, T. Udem, T. Wilken, N. Kolachevsky, M. Abgrall, D. Rovera, C. Salomon, P. Laurent, and T. W. Haensch Phys. Rev. Lett. 107 20 (2011)
10:00 BASE – towards a 10-fold improved measurement of the antiproton magnetic moment - Barbara Maria Latacz (CERN; RIKEN, Ulmer Fundamental Symmetries Laboratory, Japan)
BASE – towards a 10-fold improved measurement of the antiproton magnetic moment
- Barbara Maria Latacz (CERN; RIKEN, Ulmer Fundamental Symmetries Laboratory, Japan)
10:00 - 10:30
Room: Festsaal BASE is a collaboration whose main experiment is located at CERN, with the goal of contributing to resolving the puzzle of the striking matter-antimatter imbalance and the mystery of the origin of dark matter. The related experiments are conducted by performing ultra-precise comparisons of the fundamental properties of single antiprotons and protons trapped in a sophisticated four Penning-trap system. The flagship experiments uniquely conducted by the BASE collaboration are the magnetic moment measurements of single protons and antiprotons. Our last measurements, the most precise determinations of these constants to date, are at the 300 p.p.t. level for protons (G. Schneider, A. Mooser, S. Ulmer, et al. Science 358, 1081 (2017)) and at 1.5 p.p.b. for antiprotons (C. Smorra, S. Ulmer, et al. Nature 550, pages 371–374 (2017)). To improve these limits, we have developed many new technological innovations and experimental methods, including fast sub-thermal cooling, a superconducting magnetic field compensation system, a new antiproton catching system for the ELENA era, and an ultra-stable quantum spin-state detection system. Putting all these experimental developments together, we are currently conducting a new proton/antiproton magnetic moment measurement campaign, with the goal to improve the precision in the determination of the antiproton magnetic moment by a factor of 5 to 10. In this talk, I will report on the status of the BASE experiment, focusing on the progress made towards more precise proton and antiproton magnetic moment measurements. I will discuss the current experimental limitations and plans for future improvements, that will be based on the first coherent single-particle nuclear spin-quantum-spectroscopy.
10:30 Pause
Pause
10:30 - 11:00
Room: Aula
11:00 Antihydrogen production and beam formation for hyperfine spectroscopy at low magnetic field - Eric Hunter (Austrian Academy of Sciences (AT))
Antihydrogen production and beam formation for hyperfine spectroscopy at low magnetic field
- Eric Hunter (Austrian Academy of Sciences (AT))
11:00 - 11:30
Room: Festsaal The ground state hyperfine splitting was recently measured to 0.4 ppb for a beam of hydrogen in the ASACUSA spectrometry line (Nowak 2024). We plan to repeat the experiment using an antihydrogen beam. So far (Kuroda 2014, Kolbinger 2021), the beam intensity is too low (<1 ground state atom per cycle) to distinguish signal from background. In an upgraded mixing trap, we cool up to 4x10^7 particles to T~25 K (Amsler 2022)-- five times lower than before. Using a positron-antiproton mixing scheme similar to ALPHA's (Ahmadi 2017), we produce 4x10^5 antihydrogen atoms---seven times more than previously reported---all of which annihilate without forming a beam. A new method of mixing (Jonsell 2019) will soon be applied to increase the beam-like fraction. First results may be available by the time of this conference. References Ahmadi, M., et al. "Antihydrogen accumulation for fundamental symmetry tests." Nature communications 8.1 (2017): 681. Amsler, C., et al. "Reducing the background temperature for cyclotron cooling in a cryogenic Penning–Malmberg trap." Physics of Plasmas 29.8 (2022). Jonsell, S., and Charlton, M. "Formation of antihydrogen beams from positron–antiproton interactions." New Journal of Physics 21.7 (2019): 073020. Kolbinger, B., et al. "Measurement of the principal quantum number distribution in a beam of antihydrogen atoms." The European Physical Journal D 75 (2021): 1-14. Kuroda, N., et al. "A source of antihydrogen for in-flight hyperfine spectroscopy." Nature communications 5.1 (2014): 3089. Nowak, L., et al. "CPT and Lorentz symmetry tests with hydrogen using a novel in-beam hyperfine spectroscopy method applicable to antihydrogen experiments." arXiv preprint arXiv:2403.17763 (2024).
11:30 GBAR - Pauline Comini (Université Paris-Saclay (FR))
GBAR
- Pauline Comini (Université Paris-Saclay (FR))
11:30 - 12:00
Room: Festsaal
12:00 ALPHA-G - William Alan Bertsche (University of Manchester (GB))
ALPHA-G
- William Alan Bertsche (University of Manchester (GB))
12:00 - 12:30
Room: Festsaal
12:30 Conference Picture
Conference Picture
12:30 - 12:45
Room: Festsaal

12:45 Break
Break
12:45 - 14:00
14:00 AEgIS - Ruggero Caravita (Universita degli Studi di Trento and INFN (IT))
AEgIS
- Ruggero Caravita (Universita degli Studi di Trento and INFN (IT))
14:00 - 14:30
Room: Festsaal
14:30 Novel super-thermal exotic atom beam for the measurement of the gravitational acceleration of muonium - Jesse Zhang (ETH Zürich)
Novel super-thermal exotic atom beam for the measurement of the gravitational acceleration of muonium
- Jesse Zhang (ETH Zürich)
14:30 - 15:00
Room: Festsaal The LEMING experiment aims to measure the gravitational free fall of muonium (Mu = $\mu^+ + e^-$), a purely leptonic, exotic atom. The experiment will be a unique probe to test the weak equivalence principle on elementary, second generation antimatter using a system without large contributions to the mass from the strong interaction. The experiment will employ atom interferometry using a three-grating interferometer, which relies on a novel, cold vacuum Mu source with a narrow energy and transverse momentum distribution. We have demonstrated the working principle of such novel source based on Mu conversion of conventional muon beams in a thin layer of superfluid helium, that provided $\sim$ 8 % conversion efficiency to an atomic beam with $\sim$ 25~mrad angular divergence. Such a Mu beam may be amenable to atom interferometry measurements that would provide a $\sim$ 1% precision on the gravitational acceleration of Mu, and furthermore, has the potential to improve the fractional precision of Mu 1S-2S measurements. In this contribution the LEMING experiment will be introduced and measurements on the first observation of Mu emitted from superfluid helium and an initial characterization of the novel Mu source will be presented. Prospects of this newly developed atomic Mu beam from superfluid helium in the context of future gravity and spectroscopy experiments will be discussed.
15:00 Lorentz Violation, CPT violation, and Spectroscopy Experiments - Arnaldo Vargas (University of Puerto Rico)
Lorentz Violation, CPT violation, and Spectroscopy Experiments
- Arnaldo Vargas (University of Puerto Rico)
15:00 - 15:30
Room: Festsaal
15:30 Pause
Pause
15:30 - 16:00
Room: Aula
16:00 Test of CPT and Lorentz invariance with a cold (anti)hydrogen beam - Chloe Malbrunot (TRIUMF)
Test of CPT and Lorentz invariance with a cold (anti)hydrogen beam
- Chloe Malbrunot (TRIUMF)
16:00 - 16:30
Room: Festsaal Precise spectroscopy of the antihydrogen atom for comparison to it's matter counternpart, the hydrogen atom, is motivated by searches for New Physics in particular to shed light on the baryon assymetry puzzle. CPT symmetry, the combination of the three discrete symmetries: Charge conjugation, Parity, and Time reversal, dictates hydrogen and antihydrogen spectra to be identical. Precise comparisons of antihydrogen and hydrogen spectra are thus powerful methods to test CPT invariance; a cornerstone of quantum field theory, which, if found to be violated, would be a definite sign of New Physics. The Standard Model Extension (SME), an effective field theory that generalises the Standard Model (SM) Lagrangian by adding terms violating CPT and Lorentz symmetry, constitues a framework that allows the comparison of different experimental constraints. In this context, the precise measurement of the antihydrogen ground state hyperfine splitting (H̄ GSHFS) has the potential to provide the most stringent test of CPT symmetry. The ASACUSA collaboration proposed the measurement of the H̄ GSHFS in a beam. Unlike other proposed measurements in a magnetic trap, the Rabi-type beam method allows for measurements at very low and controlled magnetic fields. We have developed and tested with hydrogen a H̄ Rabi-spectrometer that reached an absolute precision of 3.8 Hz on the 1.42 GHz transition. I will report on new measurements which improved on this result and allowed to puts first constraints on a set of coefficients of the Standard Model Extension, which were not measured by previous experiments.
16:30 Lorentz violation test with pulsed Ramsey spectroscopy with Yb+ - Laura Dreissen
Lorentz violation test with pulsed Ramsey spectroscopy with Yb+
- Laura Dreissen
16:30 - 17:00
Room: Festsaal
17:00 En route to a CPT test based on anti-H$_2^+$: vibrational spectroscopy of a H$_2^+$ ensemble and nondestructive spectroscopy of a single HD$^+$ ion in a Penning trap - Stephan Schiller (Heinrich-Heine-Universität Düsseldorf)
En route to a CPT test based on anti-H$_2^+$: vibrational spectroscopy of a H$_2^+$ ensemble and nondestructive spectroscopy of a single HD$^+$ ion in a Penning trap
- Stephan Schiller (Heinrich-Heine-Universität Düsseldorf)
17:00 - 17:30
Room: Festsaal An attractive approach for testing CPT invariance is the comparison of a vibrational transition frequency of anti-H$_2^+$, composed of two antiprotons and a positron, with that of its matter counterpart H$_2^+$ [1,2]. The motivation for considering this - so far not existent - system is that its rovibrational transitions are intimately related to the presence of the antiproton-antiproton interaction, an interaction that can therefore be probed in the low-energy regime [3]. This regime is not accessible with high precision in other experiments. Furthermore, the transitions are strongly dependent on the ratio of positron mass and antiproton mass. In comparison, laser spectroscopy of antihydrogen has only a weak sensitivity to this ratio and antiproton Penning trap mass spectrometry experiments [4] face the challenge of progressing towards higher accuracy. Due in part to (anti-)H2+ being both a molecule and an ion, its vibrational spectroscopy in a Penning trap [2] could exhibit several important advantages: need of only small particle numbers, access to multiple candidate transitions, extremely high line quality factor, ultrasmall systematic shifts [5], long trapping times, possibility of nondestructive spectroscopy of a single anti-H$_2^+$ for extended duration. Here we present progress in the exploration of techniques likely to be useful for future spectroscopy of anti-H$_2^+$. Evidently, we use matter systems for test purposes: H$_2^+$ and the related HD$^+$ molecular ion. Concerning the spectroscopy of vibrational transitions in H$_2^+$, we report on the first laser vibrational spectroscopy [6], performed in a radiofrequency trap on small ensembles of sympathetically cooled H$_2^+$ molecules. We employed electric quadrupole spectroscopy [7], originally proposed by Dehmelt. Our spectroscopy was limited by Doppler broadening; we shall discuss our efforts towards Doppler-free spectroscopy. Since the production rate of anti-H$_2^+$ is likely to be small, it could be essential to employ an "economic" spectroscopy technique: it should be non-destructive and should be able to work with a small number of particles or even a single particle. Using the ALPHATRAP Penning trap apparatus, we have succeeded in reliably confining and performing spectroscopy on one single HD$^+$ molecule for many weeks without interruption [8]. Electron spin resonance spectroscopy was performed on several transitions, allowing determination of the g-factor of the bound electron and the spin structure of the rovibrational ground level. The spectroscopy did not destroy the state, much less the molecule itself. Finally, we have identified rovibrational transitions of H$_2^+$ or anti-H$_2^+$ having systematic Zeeman shifts in a Penning trap allowing for attractive levels of overall spectroscopic accuracy [2]. These results lead us to consider the next explorative step: implememting high-accuracy laser spectroscopy of H$_2^+$ in ALPHATRAP. The prospects will be outlined. [1] H. Dehmelt, Physica Scripta, T59, 423 (1995) [2] E.G. Myers, Phys. Rev. A 98, 010101 (2018) [3] S. Schiller, Contemporary Physics 63, 247 (2022) [4] M.J. Borchert, et al., Nature 601, 53 (2022) [5] S. Schiller, V. I. Korobov, D. Bakalov, Phys. Rev. Lett. 113, 023004 (2014) [6] M.R. Schenkel, S. Alighanbari, S. Schiller, Nature Physics 20, 383 (2024) [7] V. I. Korobov, P. Danev, D. Bakalov, S. Schiller, Phys. Rev. A 97, 032505 (2018) [8] C. König et al., subm. (2024)
17:30 Poster Prize Ceremony
Poster Prize Ceremony
17:30 - 17:50
Room: Festsaal

19:00 Conference dinner
Conference dinner
19:00 - 22:30
Thursday 29 August 2024

08:30 Registration
Registration
08:30 - 09:00
Room: Clubraum
09:00 In memory of Johann Zmeskal and Carlo Guaraldo - Johann Marton
In memory of Johann Zmeskal and Carlo Guaraldo
- Johann Marton
09:00 - 09:15
Room: Festsaal
09:15 Prospect of hadronic-molecule with strangeness - Masahiko Iwasaki (RIKEN)
Prospect of hadronic-molecule with strangeness
- Masahiko Iwasaki (RIKEN)
09:15 - 09:45
Room: Festsaal Recently, we conducted a kaonic nuclear-bound state search experiment using a $K^-$ beam (1 GeV/c) bombarding a $^3$He target. We succeeded in observing a kaonic nuclear quasi-bound state, "$K^-pp$", via a nucleon knockout reaction, $K^-N\rightarrow \overline{K}n'$, followed by the decay $\overline{K}NN\rightarrow \Lambda p(2N_{\overline{K}A})$ in the two-nucleon $\overline{K}$ absorption process, resulting in the final state $\Lambda p + n'$. The result shows that the "$K^-pp$" binding energy is about 40 MeV below the binding threshold, with a decay width of about 100 MeV. From the $\Lambda p$ decay, the isospin of the system is determined to be $I_{\overline{K}NN} = 1/2$. The momentum transfer distribution of the $\Lambda p$ system is very broad, implying that the size of the "$K^-pp$" system might be very compact [1, 2]. We extended our study on the kaonic nuclear-bound state in two ways: A) by studying the mesonic decay process of the $\overline{K}NN$ via one-nucleon $\overline{K}$ absorption ($1N_{\overline{K}A}: \overline{K}N\rightarrow \pi Y$ ), and B) by searching for the $\overline{K}NNN$ bound state through the $\Lambda d$ invariant mass study of the $\Lambda d + n'$ final state with a $k^-$ beam (1 GeV/c) bombarding a $^4$He target. The aim of A) is to understand why the decay width of "$K^-pp$" is about twice as broad as that of $\Lambda(1405)$ ($\approx 50$ MeV), which is assumed to be a molecule-like hadronic cluster composed of a $\overline{K}$ meson and a nucleon, i.e., $\Lambda(1405) \equiv \overline{K}N$ , as introduced by R. H. Dalitz et. al. [3]. The result shows that the $\overline{K}NN\rightarrow \pi YN$ decay is dominant ($1N_{\overline{K}A}\gg 2N_{\overline{K}A}$) and that the $\pi\Sigma N$ to $\pi\Lambda N$ ratio is about 1:1, indicating that the $I_{\overline{K}N} = 1$ absorption channel is approximately equal to the $I_{\overline{K}N} = 0$ channel. The result also suggests that there is a hint of the "$\overline{K}^0nn$" bound state, a charge mirror state of "$K^-pp$", existing in the $\pi^-\Lambda p$ invariant mass spectrum of the $\pi^-\Lambda p + p'$ final state. In the $\Lambda d$ invariant mass study B), the two dimensional preliminary spectrum of the $\Lambda d$ invariant mass and the momentum transfer to $\Lambda d$ ($m_{\Lambda d}, q_{\Lambda d}$) shows an almost identical distribution to ($m_{\Lambda p}, q_{\Lambda p}$), indicating the presence of $\overline{K} NNN$, decaying to $\Lambda d$. If this is another kaonic nuclear-bound state, then the isospin, spin parity is fixed to be $I(J^P ) = 0(1/2^-)$. In this talk, we'll describe these two new results on kaonic nuclear-bound states and discuss the prospects of studying the molecule-like hadronic cluster with strangeness. References [1] S. Ajimura et al., Phys. Lett. B 789, 620-625 (2019) [2] T. Yamaga et al., Phys. Rev. C 102, 044002 (2020) [3] R.H. Dalitz and S.F. Tuan, Ann. Phys., 3, 307 (1960) [4] T. Yamaga et al., arXiv:2404.01773 (2024)
09:45 Theory of kaon-nucleon interaction - Maxim Mai (Bern)
Theory of kaon-nucleon interaction
- Maxim Mai (Bern)
09:45 - 10:15
Room: Festsaal
10:15 SIDDHARTA 2 - first results - Francesco Sgaramella (INFN - National Institute for Nuclear Physics)
SIDDHARTA 2 - first results
- Francesco Sgaramella (INFN - National Institute for Nuclear Physics)
10:15 - 10:45
Room: Festsaal
10:45 Pause
Pause
10:45 - 11:15
Room: Aula
11:15 Hyperon puzzle of neutron stars examined from heavy-ion collisions and hypernuclei - Asanosuke Jinno
Hyperon puzzle of neutron stars examined from heavy-ion collisions and hypernuclei
- Asanosuke Jinno
11:15 - 11:45
Room: Festsaal The hyperon puzzle of neutron stars refers to the problem that most of the equations of state with hyperons are not sufficiently stiff to support the observed massive neutron stars. One promising solution to the puzzle is that the three-body interaction between hyperon and medium nucleons produces so strong repulsion that $\Lambda$'s do not appear in neutron stars. The $\Lambda$ potential in nuclear matter which fulfills the $\Lambda$-suppressing scenario is calculated by using chiral effective field theory with a decuplet saturation model [1]. This $\Lambda$ potential is highly repulsive compared to the conventional ones, and it should verified its consistency with existing experimental data. We found that the repulsive $\Lambda$ potential derived from chiral effective field theory is consistent with the $\Lambda$ directed flow of heavy-ion collision [2] and the $\Lambda$ hypernuclear spectroscopy [3]. On the other hand, the conventional attractive $\Lambda$ potential is found to explain both the $\Lambda$ directed flow and the $\Lambda$ binding energy data at the same level of accuracy. In this talk, we will discuss what is needed to distinguish the repulsive and attractive $\Lambda$ potentials from experimental data. [1] D. Gerstung, N. Kaiser, and W. Weise, Eur. Phys. J. A 56 (2020) 175. [2] Y. Nara, A. Jinno, K. Murase, and A. Ohnishi, Phys. Rev. C 106 (2022) 044902. [3] A. Jinno, K. Murase, Y. Nara, and A. Ohnishi, Phys. Rev. C 108 (2023) 065803.
11:45 Cosmic antinuclei from exotic sources - Johannes Herms (Max-Planck-Institut für Kernphysik)
Cosmic antinuclei from exotic sources
- Johannes Herms (Max-Planck-Institut für Kernphysik)
11:45 - 12:15
Room: Festsaal Cosmic rays are messengers of distant Galactic places and times. Due to the baryon asymmetry of the Universe, antinuclei in cosmic rays inherently point to origins in baryon-symmetric high energy particle physics or very exotic places. This talk reviews sources of cosmic ray antinuclei --observed, plausible or possible-- and the role that antinuclei may play in their detection.
12:15 Tetraquarks - Changzheng YUAN
Tetraquarks
- Changzheng YUAN
12:15 - 12:45
Room: Festsaal Since all the hadrons could be categorized as either baryons with three quarks or mesons with one pair of quark-antiquark pair, states with more than three quarks were called “exotic”, such as tatraquark states with two pairs of quark-antiquark or pentaquark states with three quarks and one quark-antiquark pair. These exotic states have been searched for for a long time but were identified only recently at high energy collider experiments. In this talk, I review the tetraquark states with different quark-flavours identified in the last few years and report recent discoveries at BESIII, LHCb, and other experiments.
12:45 Break
Break
12:45 - 14:00
14:00 Parallel A
Parallel A
14:00 - 17:20
Room: Sitzungssaal
Contributions

14:00 Calculation of integration and disintegration processes of antihydrogen positive ions in collisions with positronium - Takuma Yamashita (Tohoku University)

14:25 The LSym experiment: a CPT symmetry test in the leptonic sector - Maria Pasinetti (Max-Planck-Institut für Kernphysik)

14:50 $\Lambda NN$ input to neutron stars from hypernuclear data - Eliahu Friedman (Racah Institute of Physics, Hebrew University, Jerusalem Israel)

15:15 High-Resolution Spectroscopy of Muonic Lithium - First Steps and Prospects of the QUARTET Experiment - Katharina von Schoeler

16:05 First measurement of X-rays from resonance states of muonic deuterium molecule using a cryogenic detector - Yuichi Toyama (Chubu University)

16:30 Perspectives of testing discrete symmetries and quantum entanglement in decays of positronium with the total-body J-PET scanner. - Pawel Moskal (Jagiellonian University)

16:55 Laser spectroscopy of the ground-state hyperfine splitting in muonic hydrogen - Lukas Affolter (ETH Zürich)
Parallel B
Parallel B
14:00 - 18:20
Room: Johannessaal
Contributions

14:00 Positron polarimetry with resonant microwave radiation - Donovan Newson

14:25 Antihydrogen annihilation detection: the ALPHA-g radial TPC - Andrea Capra (TRIUMF (CA))

14:50 A New Technique to Measure the Axial and Transverse Energy of Trapped Antihydrogen Atoms during release from an Ioffe-Pritchard Magnetic Trap - Danielle Louise Hodgkinson (University of California Berkeley (US))

15:15 A Novel Low-Energy Ion Source: Production and Trapping of H- Ions for H/Hbar Comparison - Daniel Miranda Silveira (Universidade Federal do Rio de Janeiro (BR))

16:05 High-sensitivity searches for matter-antimatter conversions at the European Spallation Source - Matthias Holl (European Spallation Source ERIC)

16:30 Towards (anti)hydrogen fountains and interferometers with the HAICU project - Makoto Fujiwara (TRIUMF (CA))

16:55 Formation of hydrogen-like Highly Charged Ions using antiprotonic atoms as pathway systems - Michael Doser (CERN)

17:20 Discussion on Future Physics at the CERN-AD - T.B. D.
18:30 Public evening talk - Stefan Ulmer (HHU Düsseldorf / RIKEN)
Public evening talk
- Stefan Ulmer (HHU Düsseldorf / RIKEN)
18:30 - 19:30
Room: Festsaal
Friday 30 August 2024

08:30 Registration
Registration
08:30 - 09:00
Room: Clubraum
09:00 Probing the size and binding energy of the hypertriton in heavy ion collisions - Maximiliano Puccio (CERN)
Probing the size and binding energy of the hypertriton in heavy ion collisions
- Maximiliano Puccio (CERN)
09:00 - 09:30
Room: Festsaal
09:30 Observation of antimatter hyperhydrogen-4 at STAR - Hao Qiu (Institute of Modern Physics, Lanzhou)
Observation of antimatter hyperhydrogen-4 at STAR
- Hao Qiu (Institute of Modern Physics, Lanzhou)
09:30 - 10:00
Room: Festsaal
10:00 Hypertriton lifetime - Daniel Gazda
Hypertriton lifetime
- Daniel Gazda
10:00 - 10:30
Room: Festsaal Over the last decade, conflicting values of the hypertriton (${}_\Lambda^3\mathrm{H}$) lifetime ($\tau({}_\Lambda^3\mathrm{H})$) were extracted from relativistic heavy-ion (RHI) collision experiments, ranging from values compatible with the free-$\Lambda$ lifetime ($\tau_\Lambda$)-as expected naively for a very weakly bound $\Lambda$ in ${}_\Lambda^3\mathrm{H}$-to lifetimes as short as $\tau({}_\Lambda^3\mathrm{H})\approx (0.4–0.7)\tau_\Lambda$. A similarly large spread of values has been obtained also in earlier measurements. Recently, we revisited theoretically this ${}_\Lambda^3\mathrm{H}$ lifetime puzzle, using ${}_\Lambda^3\mathrm{H}$ and ${}^3\mathrm{He}$ wave functions computed within the *ab initio* no-core shell model employing interactions derived from chiral effective field theory to calculate the two-body decay rate $\Gamma({}_\Lambda^3\mathrm{H}\to{}^3\mathrm{He}+\pi^-)$. To derive $\tau({}_\Lambda^3\mathrm{H})$, we evaluated the inclusive $\pi^-$ decay rate $\Gamma_{\pi^-}({}_\Lambda^3\mathrm{H})$ by using the measured branching ratio $\Gamma({}_\Lambda^3\mathrm{H}\to{}^3\mathrm{He}+\pi^-)/\Gamma_{\pi^-}({}_\Lambda^3\mathrm{H})$ and added the $\pi^0$ contributions through the $\Delta I = \frac{1}{2}$ rule. We found significant but opposing contributions to $\tau({}_\Lambda^3\mathrm{H})$ arising from $\Sigma NN$ admixtures in ${}_\Lambda^3\mathrm{H}$ and from $\pi^- -{}^3\mathrm{He}$ final-state interaction [1], as well as substantial theoretical uncertainties inherent in the employed nuclear and hypernuclear interaction models [2]. Since $\tau({}_\Lambda^3\mathrm{H})$ was found to be strongly correlated with the $\Lambda$ separation energy in ${}_\Lambda^3\mathrm{H}$ ($B_\Lambda$), the value of which suffers from large experimental as well as theoretical uncertainties, we conclude that none of the conflicting RHI measured lifetime values can be excluded, but rather implies its own constraint on $B_\Lambda$. [1] A. Pérez-Obiol, D. Gazda, E. Friedman, A. Gal, *Revisiting the hypertriton lifetime puzzle*, Phys. Lett. B 811, 135916 (2020) [2] D. Gazda, A. Pérez-Obiol, E. Friedman, A. Gal, *Hypertriton lifetime*, Phys. Rev. C 109, 024001 (2024)
10:30 Pause
Pause
10:30 - 11:00
Room: Aula
11:00 J-PARC - future plans, hadron hall - Fuminori Sakuma (RIKEN)
J-PARC - future plans, hadron hall
- Fuminori Sakuma (RIKEN)
11:00 - 11:30
Room: Festsaal The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through the experiments with intense particle beams. Over the past decade, many results in particle and nuclear physics have been obtained at the present facility. In order to expand the physics programs to unexplored regions that have never been reached, the extension project of the Hadron Experimental Facility has been extensively discussed. We will discuss the physics of the current and the extended Hadron Experimental Facility for solving the issues in the fields of the strangeness nuclear physics, hadron physics, and flavor physics.
11:30 PSI - future plans, extensions - Andreas Knecht
PSI - future plans, extensions
- Andreas Knecht
11:30 - 12:00
Room: Festsaal At the Paul Scherrer Institut (PSI) muon rates of up to 4x10^8 mu/s are available, produced by its 1.4 MW proton accelerator complex HIPA. While these are currently the highest muon rates available worldwide, projects in the US and Japan are underway that will be able to surpass these intensities by several orders of magnitude. In order to maintain PSI’s position at the intensity frontier in muon physics and to utilize the unique DC machine structure, a project is under way of creating a next-generation high-intensity muon beam (HIMB) by modifying the existing Target M station. Surface muon rates of the order of 10^10 mu+/s can be achieved by placing two normal-conducting capture solenoids close to a slanted slab target and transporting the muons to the experimental areas with a beamline consisting of large aperture solenoids and dipoles. This contribution will present the current status of the project.
12:00 The PANDA Experiment - Klaus Peters (Institut fuer Experimentalphysik I)
The PANDA Experiment
- Klaus Peters (Institut fuer Experimentalphysik I)
12:00 - 12:30
Room: Festsaal The PANDA experiment represents one of the scientific pillars of the Facility for Antiproton and Ion Research by utilizing an antiproton beam for unsurpassed high statistics and high precision hadron physics in the meson and baryon sector with flavors up to charm. The PANDA experiment will use a multipurpose magnetic detector with full particle ID comprising a target and a forward spectrometer to make maximum us of the stored antiproton beam with momenta up to 15 GeV/c and luminosities reaching 10^32/cm2/s when impinging on a our world record gas-jet target. The current status of PANDA will be presented as well as bridging activities which will allow scientific harvest with PANDA technologies and along the lines of the scientific goals of PANDA as long as the PANDA detector is not fully operational.
12:30 Closing and farewell - Eberhard Widmann (Austrian Academy of Sciences (AT))
Closing and farewell
- Eberhard Widmann (Austrian Academy of Sciences (AT))
12:30 - 12:45
Room: Festsaal