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Eberhard Widmann (Austrian Academy of Sciences (AT))26/08/2024, 09:00
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Prof. Claude Amsler (Austrian Academy of Sciences (AT))26/08/2024, 09:20
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Davide Gamba (CERN)26/08/2024, 09:30
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...
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Luca Venturelli (Universita di Brescia (IT))26/08/2024, 10:00
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Frank Wienholtz (TU Darmstadt)26/08/2024, 11:00
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...
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Georgy Kornakov (Warsaw University of Technology (PL))26/08/2024, 11:30
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...
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Angela Gligorova (University of Vienna (AT))26/08/2024, 12:00
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...
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Jean-Christophe David26/08/2024, 14:00
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...
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Laura Šerkšnytė (Technische Universitaet Muenchen (DE))26/08/2024, 14:30
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Zhili Weng (Massachusetts Inst. of Technology (US))26/08/2024, 15:00
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...
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Dr Thomas Siegert (JMU Würzburg)26/08/2024, 16:00
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...
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Dr 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)26/08/2024, 16:30
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...
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Thorsten Schumm (T)26/08/2024, 17:00
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.
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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. -
Rebecca J Daly (University College London)27/08/2024, 09:00
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...
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Dr Kenji Shu (University of Tokyo)27/08/2024, 09:30
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...
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Akira Ishida (The University of Tokyo)27/08/2024, 10:00
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...
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Masaki Hori (Imperial College London)27/08/2024, 11:00
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Nancy Paul (Laboratoire Kastler Brossel)27/08/2024, 11:30
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Dr Patrick Strasser (KEK)27/08/2024, 12:00
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...
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Francesco Nozzoli (Universita degli Studi di Trento and INFN-TIFPA (IT))27/08/2024, 14:00
The search for low energy anti-nuclei in cosmic rays allows a test of fundamental physics problems such as the possible presence of primordial antimatter or the nature of Dark Matter.
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The “PHeSCAMI” (Pressurized Helium Scintillating Calorimeter for AntiMatter Identification) project is aiming to study a new signature for the identification of anti-nuclei in cosmic rays.
In particular,... -
T. A. Tanaka (Institute of Physics, The University of Tokyo)27/08/2024, 14:00
We have proposed a spectroscopic study of antihydrogen ($\mathrm{\bar{H}}$) Lamb shift using a neutral antiatomic beam at keV energies. Direct spectroscopy of the $n=2$ Lamb shift transition of $\mathrm{\bar{H}}$ atoms would enable the first measurement of the antiproton ($\bar{p}$) charge radius. Recently, the GBAR experiment demonstrated the production of 6.1 keV $\mathrm{\bar{H}}$ atoms via...
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Takashi Higuchi (KURNS, Kyoto University)27/08/2024, 14:25
The neutron-antineutron oscillation violates baryon number conservation and is of great importance in the context of testing Grand Unified Theories and understanding the origin of the baryon asymmetry in the universe [1].
Currently, the oscillation time is constrained to be $> 0.86 \times 10^8$ s for free neutrons, and $> 2.7\times 10^8$ s for bound neutrons [2,3]. In view of experiments...
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Steve Jones27/08/2024, 14:25
The gravitational and spectroscopic properties of antihydrogen are being measured with ever increasing precision. The limits for such experiments are not expected to come from the measurement resolution, but rather from hard-to-characterise systematic effects. These could be overcome by directly comparing hydrogen and antihydrogen, i.e. measuring both species in the same trap, using the same...
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Dr Kenta Itahashi (RIKEN)27/08/2024, 14:50
The latest results from the spectroscopy of deeply bound pionic Sn 121 atoms, performed at RIBF, RIKEN, are reported. The binding energies and widths of the pionic orbitals were determined, and the pion-nucleus interaction was deduced with unprecedented precision. It was found, after extensive analysis, that the chiral condensate at nuclear saturation density is reduced by a factor of 60+-3%...
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Fredrik Olof Andre Parnefjord Gustafsson (CERN)27/08/2024, 14:50
The Antimatter Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) at CERN's Antimatter Decelerator (AD) is used for the production and study of antimatter bound systems, such as antihydrogen for the gravitational influence on a horizontal beam of cold antihydrogen atoms [1]. AEGIS has achieved remarkable performance in trapping antiprotons and successfully demonstrated the pulsed...
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Antoine Camper (University of Oslo (NO))27/08/2024, 15:15
Positronium is the bound state of an electron and its antimatter counterpart, a positron. With just two times the mass of the electron and no nucleus, this exotic compound is the lightest of all known atoms with no gluon contribution to its mass. Its electronic structure resembles the one of hydrogen with a factor two lower reduced mass. Positronium is therefore a system of particular interest...
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Yoshiki Tanaka (RIKEN)27/08/2024, 15:15
The possible existence of $\eta^\prime$ meson nucleus bound states ( $\eta^\prime$-mesic nuclei) has been attracting interests both theoretically and experimentally, since in-medium properties of the $\eta^\prime$ meson are closely related to the axial $U(1)$ anomaly and the chiral symmetry in QCD. The especially large mass of the $\eta^\prime$ meson ($\sim$958 MeV/c$^2$) compared with the...
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Giovanni Malfattore (University & INFN, Bologna (IT))27/08/2024, 16:05
The formation mechanism of light (anti)nuclei in high-energy hadronic collisions remains an open question in high-energy physics. Their production mechanism is investigated by comparing experimental data with phenomenological models using statistical hadronization or a coalescence approach.
In particular, the coalescence mechanism finds an essential application in cosmic antinuclei studies...
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Jonas Ludwig Fischer (TU Darmstadt)27/08/2024, 16:05
We report on the design and characterization of an antiproton deceleration beamline, based on a pulsed drift tube, for the PUMA experiment at the Antimatter Factory at CERN. The design has been tailored to high-voltage (100 kV) and ultra-high vacuum (below $10^{-10}$ mbar) conditions. A first operation achieved decelerating antiprotons from an initial energy of 100 keV down to $(3898 \pm 3)$...
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Nicolo Jacazio (Universita e INFN, Bologna (IT))27/08/2024, 16:30
The advent of the LHC as antimatter factory has enabled an unprecedented effort to measure the production of light (anti)nuclei from pp to heavy-ion collisions, providing input for a detailed study of nucleosynthesis in high-energy interactions. However, the production of these bound states is not modelled in commonly used event generators. Yet the detection of cosmic antinuclei is predicted...
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Christian Smorra (Heinrich Heine University Dusseldorf (DE))27/08/2024, 16:30
The world’s only source of low-energy antiprotons is currently the AD/ELENA facility located at CERN. Precision measurements on single antiprotons have been conducted at this facility and provide stringent tests of fundamental interactions and their symmetries. However, magnetic field fluctuations from the facility operation limit the precision of upcoming measurements. To overcome this...
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Dr Naofumi Kuroda (University of Tokyo (JP))27/08/2024, 16:55
The ASACUSA CUSP experiment upgraded the MUSASHI antiproton trap with a drift tube accelerator to receive antiproton beams from ELENA, which replaced the Radio-Frequency Quadrupole decelerator. ELENA provides antiprotons at a fixed energy of 100 keV. The drift tube adjusted the injection energy of antiproton beams for the thin energy degrader at the entrance of the trap by 19 keV. The number...
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Moritz Schlaich (Technische Universitaet Darmstadt (DE))27/08/2024, 16:55
The decay of antiprotonic atoms may lead to the formation of hypernuclei that can be produced via strangeness exchange reactions following the antiproton-nucleon annihilation. To estimate the hypernuclei yields that can be expected by these kind of reactions, simulations were performed within the GiBUU transport framework.
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Using $^{16}$O, $^{40}$Ar, $^{84}$Kr and $^{132}$Xe as target nuclei,... -
Mr Bharat Singh Rawat (University of Liverpool / Cockcroft Institute)27/08/2024, 17:30
3D Simulation studies of mixed plasma confinement at AEgIS
Bharat Singh Rawat 1,2,3, Narender Kumar1,2, Benjamin Riena ̈cker1,3, Carsten P Welsch1,2,3
and
The AEgIS Collaboration31 Department of Physics, University of Liverpool, Liverpool L69 3BX, United Kingdom.
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2 The Cockcroft Institute, Daresbury, Warrington, WA44AD,UK.
3 AEgIS Collaboration, CERN, Geneva, Switzerland.... -
Gonçalo Baptista27/08/2024, 17:30
Quantum electrodynamics (QED) is a foundation of modern physics, whose detailed study is one of the frontiers for Beyond Standard Model searches. In this domain, new physics may appear as minute differences between theory and experiments, accessible with extremely high precision QED tests. While extensive studies have been performed for light systems (hydrogen, antihydrogen, muonic hydrogen,...
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Naritoshi Kawamura27/08/2024, 17:30
The conversion from muonium (Mu, μ+e-) to anti-muonium (antiMu, μ-e+) is strongly suppressed in the Standard Model (SM) of particle physics because it violates the conservation of the leptonic family number. In many theories of SM extension, leptonic family numbers (lepton flavors) are not conserved and then the Mu-antiMu conversion can become observable level, just below the current...
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Malgorzata Grosbart (CERN)27/08/2024, 17:30
AEgIS experiment at CERN utilizes a charge-exchange reaction with Rydberg positronium for the formation of a pulsed antihydrogen (Hbar) beam for a gravity measurement in the absence of external fields [1]. Hbar formation with all its intermittent steps is achieved in cryogenic, Ultra High Vacuum conditions, inside of a Penning-Malmberg trap system.
The controlled environment of the AEgIS...
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Nathalie Ziehl27/08/2024, 17:30
Mirror matter was initially proposed as a possible fix of parity violation in the weak interaction on a global scale[1]. More in general, mirror matter and mirror neutrons in particular could help explain baryon number violation and are viable candidates for dark matter[2].
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The mirror-neutron experiment at PSI was a storage measurement, designed to search for anomalous disappearances of... -
Jakub Zielinski (Warsaw University of Technology (PL))27/08/2024, 17:30
One of the compelling areas of focus in nuclear and atomic physics are isotopes and isomers of different atoms. Many different isotopes are highly desired for experimental studies; however, accessing them is challenging with existing methods. A novel method that involves antiprotonic atoms has been suggested in [1]. In this method, the creation of isotopes is achieved by forcing the...
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Gareth Smith (TRIUMF (CA))27/08/2024, 17:30
The ALPHA-g experiment recently made the news for the first direct measurement of the gravitational free-fall of anti-hydrogen. Crucial to this milestone is a detector system capable of accurately recording the vertical position of annihilating anti-atoms, with two critical requirements: precise localization of anti-hydrogen annihilations into the "up" or "down" regions, and effective...
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Antonio Gioiosa (University of Molise & INFN Roma Tor Vergata)27/08/2024, 17:30
The Mu2e experiment at Fermilab aims to observe coherent neutrinoless conversion of a muon to an electron in the field of an aluminum nucleus, with a sensitivity improvement of 10,000 times over current limits.
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The Mu2e Trigger and Data Acquisition System (TDAQ) uses \emph{otsdaq} framework as the online Data Acquisition System (DAQ) solution.
Developed at Fermilab, \emph{otsdaq} integrates... -
Damian Goeldi27/08/2024, 17:30
The LEMING experiment aims to test weak equivalence in leptonic antimatter using a novel cold muonium beam, that we recently synthesised from superfluid helium. For this experiment, it is paramount to operate particle detectors at temperatures below 1K, partially in the superfluid environment. The cryogenic detectors need to be capable of tracking positrons from decaying muons in a large solid...
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Quentin Senetaire (Laboratoire Kastler Brossel (FR))27/08/2024, 17:30
Experimental Investigation of QED Effects through Antiprotonic Atom X-ray spectroscopy: first test beams with TES detectors and solid targets
Senetaire Quentin, Paul Nancy, Baptista Gonçalo and Indelicato Paul
Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-PSL Research University, Collège de France, Case 74; 4, place Jussieu, F-75005 Paris, France
...
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Deepak Kumar (Jagiellonian University)27/08/2024, 17:30
Quantum Electrodynamics (QED) postulates that the photons emitted during the self-annihilation of the singlet state of positronium atoms (Ps) in a vacuum are maximally entangled in their polarization [1]. Despite theoretical support for this behavior, experimental verification has proven to be challenging [2,3]. This challenge may arise from the interference of alternative decay processes,...
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Nikolay Maksyuta (Taras Shevchenko National University of Kyiv, Ukraine)27/08/2024, 17:30
The paper proposes obtaining exotic moving muonium atoms Mu through the capture of valence electrons from carbon atoms by antimuons $\mu^{+}$channeled (the channeling effect is described, for example, in [1]) along the axes of carbon nanotubes (CNTs). The probability of such captures, as in previous works [2,3], is calculated using non-stationary perturbation theory. However, in [2, 3], exotic...
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Carina Killian (Austrian Academy of Sciences (AT))27/08/2024, 17:30
A low energy particle confined by a horizontal reflective surface and gravity settles in gravitationally bound quantum states. These gravitational quantum states (GQS) were so far only observed with neutrons [1,2]. However, the existence of GQS is predicted also for atoms.
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The GRASIAN collaboration pursues the first observation of GQS of atoms, using a cryogenic hydrogen beam. This endeavor... -
Robert Waddy27/08/2024, 17:30
A high quality superthermal muonium beam (bound $e^-/\mu^+$) has recently been developed, which might be amenable for atom interferometry, and next generation laser spectroscopy experiments.
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Here we provide an overview into the design and development of the first interferometer prototype, together with the theoretical expectations of sensitivity.
A Talbot-Lau interferometer is being... -
Tadashi Hashimoto (RIKEN)27/08/2024, 17:30
Hypertriton, as the simplest hypernucleus, provides essential benchmarks for hypernuclear physics. However, we have struggled with the so-called “hypertriton lifetime puzzle” these years. To pin down the situation, we are proceeding with a new experiment at J-PARC to measure the lifetimes of light hypernuclei using the (K^-, \pi^0) reaction. The spin-none-flip nature of the reaction and the...
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Justyna Mędrala-Sowa (Wydział Fizyki, Astronomii i Informatyki Stosowanej, Uniwersytet Jagielloński, Kraków)27/08/2024, 17:30
Positronium (Ps) atom, consisting of an electron and a positron bound together, represents a unique and intriguing system for fundamental physics research. This composite particle offers an exceptional opportunity for conducting precise tests, owing to its properties that are accurately described by Quantum Electrodynamics (QED) within the framework of the Standard Model (SM). Moreover, the...
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Pooja Tanty27/08/2024, 17:30
Being governed by electromagnetic (EM) interaction, the bound state of electron and positron forms a metastable state-Positronium (Ps). Ps is hydrogen-like atom, free from any hadronic background as well as any weak interaction effects. Being a leptonic system, it is governed by Quantum Electrodynamics (QED) because of which accurate theoretical predictions can be made and put to stringent...
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Denis Jankovic (Institut de Physique et Chimie des Materiaux de Strasbourg (FR) / Karlsruhe Institute of Technology (DE))27/08/2024, 17:30
Keywords: muonic atoms; nuclear structure; hyperfine structure
The study of exotic atoms, such as muonic hydrogen-like ions [1-3], provides an intriguing way to probe the internal structure of their atomic nuclei. In this work, we use nuclear structure simulations to accurately calculate the hyperfine splitting of muonic hydrogen-like ions, focusing in particular on the incorporation of...
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Alina Weiser (Austrian Academy of Sciences (AT))27/08/2024, 17:30
Even though the existence of 33 molecules containing positronium has been predicted using various methods [1], so far only the simplest of them (PsH) has been observed experimentally in vacuum, with that discovery dating back more than 30 years [2]. We aim to confirm the previous result [2], and additionally observe further molecules such as PsO and PsF, as well as measure their binding energy...
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Stefano Migliorati (Universita di Brescia (IT))27/08/2024, 17:30
An analysis is conducted on both the elastic scattering and annihilation cross-sections of antiproton-nucleus data at low energy, aiming to identify shared parameters for a Woods-Saxon optical potential.
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Given the limited data available at low energies, it is important to conduct new measurements in these energy ranges and using diverse nuclear targets to enhance our comprehension of the... -
Karen Kang (Boston University (US))27/08/2024, 17:30
The cross sections for the production of different composite hadronic and leptonic objects in photon-photon fusion processes in proton-proton, proton-nucleus, and nucleus-nucleus ultraperipheral collisions at the CERN Large Hadron Collider (LHC) and Future Circular Collider (FCC), as well as in Au-Au collisions at the BNL Relativistic Heavy-Ion Collider (RHIC), are estimated. First, the...
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Benjamin Rienacker (University of Liverpool (GB))27/08/2024, 17:30
We present ongoing efforts to characterize forward-emitted positronium (Ps) from transmission positron/Ps converters. Utilizing innovative silicon membranes with pass-through nanochannels [1], we aim to build upon recent developments within the AEgIS collaboration. Our focus lies on understanding the velocity distribution of forward-emitted Ps and its interaction with ultraviolet (UV) laser...
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Ms Neha Chug (Jagiellonian University)27/08/2024, 17:30
One of the enduring challenges in fundamental physics is rigorously quantifying deviations from, or upholding the exactness of, discrete symmetries observed in nature. Measurements of angular correlations in the decays of polarized positronium (Ps) provide a sensitive probe for testing CPT symmetry in the electroweak interactions [1]. Due to its unique nature as the lightest bound state of an...
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Ruggero Caravita (Universita degli Studi di Trento and INFN (IT))27/08/2024, 17:30
The generation of low-energy anti-nuclei for experimentation is a formidable challenge, stemming from the difficulty of primarily producing anti-nuclei in more than minuscule quantities during high-energy collisions. A notable exception is the antideuteron, for which several production mechanisms are known with a variety of efficiencies (from 0.1 to 10-5) and momentum/energy distributions....
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Prof. Hiroyuki Torii (University of Tokyo (JP))27/08/2024, 17:30
Muonium (Mu), an exotic atom composed of a positive muon and an electron ($\mu^+ e^-$), is a suitable probe for precise tests of bound-state QED as well as for searching for new physics beyond the Standard Model. MuSEUM collaboration at J-PARC has so far succeeded in measuring the ground-state hyperfine splitting (HFS) of the muonium atom under the zero magnetic field, and is now aiming at a...
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Carsten Peter Welsch (Cockcroft Institute / University of Liverpool)27/08/2024, 17:30
The 4M€ Accelerators Validating Antimatter physics (AVA) project has enabled an interdisciplinary and cross-sector R&D program on low energy antimatter research. The network comprised 13 universities, 9 national and international research centers and 13 partners from industry.
Between 2016 and 2021, AVA has successfully trained 16 early-stage researchers that were based at universities,...
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Viktoria Kraxberger (Austrian Academy of Sciences (AT))27/08/2024, 17:30
As antimatter is mostly detected through its annihilation, the antiproton-nucleus ($\bar{p}A$) interaction is a crucial process. Various models, compared mostly to older data from experiments at LEAR, show deviations from measurements by large factors, indicating that, despite its significance, the annihilation mechanism is not well established.
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A study of $\bar{p}A$ annihilations at rest on... -
Ahmed Ouf (johannes gutenberg universität mainz)27/08/2024, 17:30
The Hyper-mu experiment at PSI aims at the first measurement of the ground state hyperfine splitting in muonic hydrogen (μp) with an accuracy of 1 ppm. Such a measurement would lead to the extraction of the two photon exchange, encoding the proton Zemach radius and polarizability, with an unprecedented relative uncertainty.
Toward the measurement of the ground state hyperfine splitting in...
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Dr Sangeetha Sasidharan (Max-Planck-Institut für Kernphysik, Heidelberg, Germany)27/08/2024, 17:30
One of the prevailing enigmas in contemporary physics is the observed disparity between the abundance of matter and antimatter in the universe, posing a fundamental challenge to the principles of the Standard Model of particle physics.
Within the LSym experiment we plan to compare the fundamental properties, specifically the charge-to-mass ratios and the g-factors, of the electron and the...
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Valerio Mascagna (Universita di Brescia (IT))27/08/2024, 17:30
Detecting charged pions emitted from antiproton annihilation on nuclei is a well-established technique utilized to determine annihilation vertex positions, crucial also for several experiments in the antimatter field. For the past decade, a detector composed of plastic scintillating bars has been integral to the ASACUSA experiment, employed in both antihydrogen formation experiments and...
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Andreas Lanz (UCL - Department of Physics and Astronomy)27/08/2024, 17:30
The current theory of General Relativity is based on the Weak Equivalence Principle (WEP), which states that the inertial and gravitational mass are equivalent. Tests of the WEP with matter have resulted in its confirmation to a relative precision of 10-15 [1], but there have been hardly any results from experiments involving antimatter. A difference in the gravitational behaviour of matter...
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Nikita Poljakov (Institut für Quantenoptik, Leibniz Universität Hannover)27/08/2024, 17:30
High-precision matter-antimatter comparisons allow to test CPT symmetry and to search for new physics beyond the standard model. The BASE collaboration contributes to these tests by measuring the charge-to-mass ratio and $g$-factor of protons and antiprotons in cryogenic Penning traps [1-3]. The BASE experiment at the Leibniz University Hannover is developing measurement schemes based on...
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Matthias Germann (CERN)27/08/2024, 17:30
The AEgIS experiment at CERN's Antiproton Decelerator aims at measuring the gravitational acceleration $\bar{\hbox{g}}$ of antihydrogen ($\bar{\hbox{H}}$) with high precision [1, 2]. A key limitation in these measurements is the $\bar{\hbox{H}}$ temperature: The thermal motion of the $\bar{\hbox{H}}$ atoms blurs their free-fall trajectories and thus limits the achievable $\bar{\hbox{g}}$...
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Takashi Higuchi (KURNS, Kyoto University)27/08/2024, 17:30
Ultracold neutrons (UCNs), neutrons with kinetic energies of ≲ 300 neV, have the unique property of being stored in a vessel with an appropriate surface material for a time on the order of 100 s, and have been used for key experiments in fundamental physics. Originally, very cold neutrons were mechanically decelerated to obtain UCNs. In 1977, the so called super-thermal method was proposed,...
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Ralf Lehnert28/08/2024, 09:00
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Janko Nauta (CERN)28/08/2024, 09:30
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)...
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Barbara Maria Latacz (CERN; RIKEN, Ulmer Fundamental Symmetries Laboratory, Japan)28/08/2024, 10:00
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...
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Eric Hunter (Austrian Academy of Sciences (AT))28/08/2024, 11:00
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...
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Pauline Comini (Université Paris-Saclay (FR))28/08/2024, 11:30
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William Alan Bertsche (University of Manchester (GB))28/08/2024, 12:00
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Ruggero Caravita (Universita degli Studi di Trento and INFN (IT))28/08/2024, 14:00
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Jesse Zhang (ETH Zürich)28/08/2024, 14:30
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.
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The experiment will employ atom interferometry using a... -
Arnaldo Vargas (University of Puerto Rico)28/08/2024, 15:00
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Chloe Malbrunot (TRIUMF)28/08/2024, 16:00
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...
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Laura Dreissen28/08/2024, 16:30
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Prof. Stephan Schiller (Heinrich-Heine-Universität Düsseldorf)28/08/2024, 17:00
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].
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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... -
Johann Marton29/08/2024, 09:00
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Masahiko Iwasaki (RIKEN)29/08/2024, 09:15
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...
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Maxim Mai (Bern)29/08/2024, 09:45
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Dr Francesco Sgaramella (INFN - National Institute for Nuclear Physics)29/08/2024, 10:15
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Asanosuke Jinno29/08/2024, 11:15
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...
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Johannes Herms (Max-Planck-Institut für Kernphysik)29/08/2024, 11:45
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.
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Changzheng YUAN29/08/2024, 12:15
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...
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Takuma Yamashita (Tohoku University)29/08/2024, 14:00
Antihydrogen positive ions ($\bar{\rm H}^+$) consisting of an antiproton and two positrons are utilized to produce cryogenic antihydrogen atoms. The $\bar{\rm H}^+$ can be collected with an electric field, sympathetically cooled by lasers with Be$^+$ ions, and subsequently neutralized by stripping off one of the positrons. The $\bar{\rm H}^+$ is integrated in the mixture of antihydrogen...
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Donovan Newson29/08/2024, 14:00
Spin polarized positron beams are employed in investigations of magnetic and electronic structure dynamics [1, 2] and may also be useful in the production of a positronium Bose-Einstein condensate [3]. Slow positron beams derived from radioactive sources are naturally spin polarized due to the non-conservation of parity in the beta decay process [4] although measuring the polarization can be...
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Andrea Capra (TRIUMF (CA))29/08/2024, 14:25
The recent measurement of the antihydrogen gravitational acceleration [Nature 621, 716–722 (2023)] relies upon the detection of the annihilation of the anti-atoms that are released from their magnetic confinement and that move under the influence of gravity. The ALPHA-g magnetic trap is surrounded by a Time Projection Chamber designed to identify the annihilation products and to reconstruct...
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Maria Pasinetti (Max-Planck-Institut für Kernphysik)29/08/2024, 14:25
The LSym experiment is a new cryogenic Penning trap experiment currently being designed at the Max-Planck-Institut für Kernphysik of Heidelberg. The goal of LSym is to conduct a stringent CPT test by comparing the properties of matter and antimatter with unprecedented sensitivity by trapping simultaneously one electron and one positron in a Penning trap, which allows performing a...
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Prof. Eliahu Friedman (Racah Institute of Physics, Hebrew University, Jerusalem Israel)29/08/2024, 14:50
This work is a sequel to our two publications from 2023 (1,2) where
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14 experimental 1s and 1p single-particle binding energies of $\Lambda$ in
hypernuclei led to a quite well-defined optical potential for the
$\Lambda$-nucleus interaction. The potential contains a traditional
linear density term and a quadratic density term, the latter representing
$\Lambda NN$... -
Danielle Louise Hodgkinson (University of California Berkeley (US))29/08/2024, 14:50
In the era of ever-increased precision measurements of the fundamental properties of antihydrogen at the ALPHA experiment at CERN, knowledge of the antihydrogen energy distribution has become vital; for example, it provided a significant contribution to the uncertainty in the first direct measurement of the gravitational acceleration of antihydrogen [1]. Increased precision in ALPHA's...
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Daniel Miranda Silveira (Universidade Federal do Rio de Janeiro (BR))29/08/2024, 15:15
The ALPHA experiment (CERN) performs precise tests of fundamental Physics using spatially confined samples of antihydrogen atoms ($\bar{\mathrm{H}}$). For a direct $\mathrm{H} - \bar{\mathrm{H}}$ spectroscopic comparison, methods for loading atomic hydrogen into the apparatus are being considered. In this direction, we have demonstrated a novel source for low energy ions, capable of producing...
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Katharina von Schoeler29/08/2024, 15:15
Precise measurements of absolute nuclear charge radii are crucial ingredients for QED tests and are valuable benchmarks for modern nuclear structure theory [1]. Muonic atom spectroscopy is well known as an ideal method to accurately determine the root-mean-square (RMS) radii of the nuclear charge density distribution. By measurements of the 2p-1s transitions of muonic atoms, this technique has...
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Dr Yuichi Toyama (Chubu University)29/08/2024, 16:05
By using a superconducting transition-edge-sensor (TES) microcalorimeter with ultra-high resolution $\Delta E\sim5~\mathrm{eV}$ (FWHM), a spectroscopic measurement of $dd\mu^*$ was successfully performed for the first time.
The $dd\mu^*$, in which $\mu^-$ is resonantly coupled with two deuterons, is predicted by the latest few-body calculations to emit dissociative X-rays with...
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Matthias Holl (European Spallation Source ERIC)29/08/2024, 16:05
The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source (ESS) to search for baryon number violation [1]. The goal of the program is to produce new insights into the origins of baryogenesis by performing searches for neutron–antineutron oscillations, increasing the sensitivity by three orders of magnitude compared with the previously established limit from...
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Prof. Pawel Moskal (Jagiellonian University)29/08/2024, 16:30
The Jagiellonian Positron Emission Tomograph (J-PET) is the first PET scanner based on plastic scintillators [1]. It is designed to measure momentum vectors and the polarization of photons originating from the decays of positronium [2,3]. In combination with the newly invented positronium imaging method [4], J-PET enables the study of discrete symmetries in positronium without the use of...
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Makoto Fujiwara (TRIUMF (CA))29/08/2024, 16:30
Precision comparisons of atomic hydrogen and its antimatter counterpart, antihydrogen, provide stringent tests of fundamental symmetries between matter and antimatter such as CPT invariance and the Weak Equivalence Principle. The most precise measurements of atomic hydrogen properties have traditionally been performed in atomic beams. In contrast, precision measurements of antihydrogen to date...
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Michael Doser (CERN)29/08/2024, 16:55
Recent simulations of the annihilation of antiprotons on the periphery of nuclei at the end of their cascade within antiprotonic atoms have highlighted the possibility of trapping (and cooling) the resulting fully stripped (highly charged) nuclear remnants. In addition to being a novel pathway for forming and trapping (even short-lived) radio-isotopes, these open the door to employing them as...
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Lukas Affolter (ETH Zürich)29/08/2024, 16:55
Laser spectroscopy of muonic hydrogen (μp) is an ideal platform to probe the proton structure. At the Paul Scherrer Institute, the CREMA collaboration aims to measure the ground-state hyperfine splitting (1S‑HFS) with a relative accuracy of $10^{-6}$ to infer the proton structure contribution (two photon exchange correction) with a relative accuracy of $10^{-4}$. This opens the way for testing...
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T.B. D.29/08/2024, 17:20
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Prof. Stefan Ulmer (HHU Düsseldorf / RIKEN)29/08/2024, 18:30
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Maximiliano Puccio (CERN)30/08/2024, 09:00
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Hao Qiu (Institute of Modern Physics, Lanzhou)30/08/2024, 09:30
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Daniel Gazda30/08/2024, 10:00
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...
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Fuminori Sakuma (RIKEN)30/08/2024, 11:00
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...
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Andreas Knecht30/08/2024, 11:30
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.
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In order to maintain PSI’s position at the intensity frontier in... -
Klaus Peters (Institut fuer Experimentalphysik I)30/08/2024, 12:00
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...
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Eberhard Widmann (Austrian Academy of Sciences (AT))30/08/2024, 12:30
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Zhili Weng (Massachusetts Inst. of Technology (US))
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Frank Maas
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Angela Gligorova (Austrian Academy of Sciences (AT))
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Johannes Herms
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Prof. Claude Amsler (Austrian Academy of Sciences (AT))
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Laura Dreissen (LaserLaB, department of Physcis and Astronomy, Vrije Univesiteit Amsterdam, The Netherlands and Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany)
High precision spectroscopic measurements in trapped cold ions, have enabled various sensitive searches for new physics beyond the Standard Model [1]. Local Lorentz invariance (LLI) is suggested to be violated in extensions of the Standard Model that include quantum-gravity [2]. We here report on a stringent test of local Lorentz invariance (LLI) in the electron-photon sector based on a novel...
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Masahiko Iwasaki (RIKEN)
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Arnaldo Vargas (University of Puerto Rico)
This presentation outlines a model derived from the Standard-Model Extension for testing Lorentz symmetry in atomic spectroscopy experiments and examines potential signals for Lorentz violation accessible in these experiments. These signals include CPT violation, indicated by differences between the hydrogen and antihydrogen spectra, as well as sidereal and annual variations of observables....
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Laura Šerkšnytė (Technische Universitaet Muenchen (DE))
Some dark matter candidates, such as the Weakly Interacting Massive Particles (WIMPs), are expected to annihilate in our galaxy and produce, among other particles, light antinuclei, which can be observed as cosmic rays. However, the same antinuclei can also be produced in ordinary cosmic ray collisions with the interstellar gas. Thus, precise modelling of signal and background cosmic ray...
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Eberhard Widmann (Austrian Academy of Sciences (AT))
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Andreas Knecht
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Frank Wienholtz (TU Darmstadt)
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Paul Alois Buhler (Stefan Meyer Institute for Subatomic Physics (SMI), Austrian Academy of Sciences (AT))
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Chloe Malbrunot (TRIUMF)
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Changzheng YUAN
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Eberhard Widmann (Austrian Academy of Sciences (AT))
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