8th International Symposium on Symmetries in Subatomic Physics (SSP2022)
Welcome to the SSP 2022!
The 8th edition of the Symposium will be held in Vienna from 29 August to 02 September. It is organized by the Stefan Meyer Institute for Subatomic Physics of the Austrian Academy of Sciences.
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Registration: Registration at the venue
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Welcome
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Welcome - Opening 15mSpeaker: Eberhard Widmann
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Welcome - LOC 15mSpeakers: Angela Gligorova (Austrian Academy of Sciences (AT)), Eberhard Widmann
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Symmetries: Lepton flavourConvener: Prof. Claude Amsler (Austrian Academy of Sciences (AT))
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Lepton flavour universality at Belle and Belle II 30m
The rate of semitauonic and electroweak penguin decays in the B sector
show hints of lepton-flavour universality violation. Belle and Belle II
data is well suited to probe such anomalies. The low-background
collision environment along with the possibility of partially or fully
reconstructing one of the two B mesons in the event offer high precision
measurements of semileptonic and electroweak B decays. This talk
presents recent Belle and Belle II results on lepton flavor universality
tests.Speaker: Dr Seema Choudhury -
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Tests of lepton flavour universality with (semi-)leptonic decays of charmed mesons 30m
The BESIII experiment has collected an integrated luminosity corresponding to 2.93 fb$^{-1}$ of data at 3.773 GeV, and 6.3 fb$^{-1}$ of data between 4.18 and 4.23 GeV, respectively, which allows for precision tests with D meson decays. We will present an overview of the recent results on lepton flavour universality tests with (semi-)leptonic decays of charmed mesons. We will also report the latest precision measurements of the decay constants fDs+ and the CKM matrix elements $|V_{cs}|$ via $D_{(s)}^+ \rightarrow l^+\nu ~(l=\mu, \tau)$ decays, which are important to test the LQCD calculations and the CKM matrix unitarity.
Speakers: Evelina Gersabeck (University of Manchester (GB)), Evelina Mihova Gersabeck (University of Manchester (GB))
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Coffee Break 30m
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Symmetries: Lepton flavourConvener: Prof. Claude Amsler (Austrian Academy of Sciences (AT))
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Lepton flavour violation and symmetry searches at PSI 30mSpeaker: Angela Papa
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The Mu2e experiment at Fermilab 25m
The Mu2e experiment at Fermilab will search for a neutrino-less muon to electron conversion with a single event sensitivity of ~3E-17. This is an improvement of four orders of magnitude in sensitivity over the current best limit. Mu2e will indirectly probe a broad class of New Physics models with mass scales up to 10,000 TeV. The Mu2e is currently under the construction with a goal to start taking data in 2025. The first data taking period is aimed to improve the current best limit by a three orders of magnitude. After a two-year shutdown, the data collection will resume to reach the designed Mu2e sensitivity. I will present the status update on the Mu2e fabrication in the preparation for the commissioning and future data taking.
Speaker: Yuri Oksuzian
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Lunch break 1h 35m
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Fundamental interactions: Double beta-decay
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Double-beta decay and test of fundamental symmetries 25m
International Centre for Advanced Training and Research in Physics,
P.O. Box MG12, 077125 Bucharest-Magurele, RomaniaAbstract
Double beta decay (DBD) is a currently hot research topic as it can offer a wide range of physics investigations beyond the Standard Model (BSM). These refer to some fundamental neutrino properties, yet unknown (neutrino nature – is it a Dirac or a Majorana particle, the neutrino absolute mass and mass hierarchy, number of neutrino flavors, etc.), conservation of the lepton number and validity of Lorentz and CP symmetries, as well as to different BSM mechanisms that can contribute to the neutrinoless double-beta decay.
In my talk, I’ll first summarize the current challenges facing the DBD study. Then, I’ll focus on the DBD potential to test fundamental symmetries and, in particular, I’ll present the current status of Lorentz invariance violation (LIV) searches. Such investigations are currently been conducted in several large experiments as EXO, GERDA, SuperNEMO, CUORE and CUPID-0, and are based, on one side, on precise measurements of the electron spectra and electron angular correlations and, on the other side, on reliable theoretical calculations of these spectra. I’ll present the theoretical formalism and precise calculation of the single, summed energy and angular correlation electron spectra, along with their deviations due to LIV. Next, I’ll show different LIV signatures that can be investigated in DBD experiments and the current constraints of the coefficient that governs the LIV strengths. Finally, I’ll propose an alternative, new method to constrain this coefficient through the measurement of the angular correlation coefficient, and show that future DBD experiments can improve these limits significantly.References
1. S. Stoica, Investigation of Lorentz symmetry violation in double-beta decay, MEDEX’19, Prague, May 28-June 2, 2019 (invited talk).
2. O. Nitescu, S. Ghinescu, and S. Stoica, J. Phys. G 47, 055112 (2020).
3. O. Nitescu, S. Ghinescu, and S. Stoica, Phys. Rev. D 103, L031701 (2021).
4. S. Stoica, Study of kinematic factors in double-beta decay, Conference on Neutrino and Nuclear Physics (CNNP2020), February 20-24, 2020, Cape Town, South Africa (invited talk).
5. S. Ghinescu, O. Nitescu and S. Stoica, Phys. Rev. D 105, 055032 (2022).Speaker: Prof. Sabin Stoica (CIFRA) -
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Final results of the neutrinoless double-beta decay search with GERDA 25m
abstract provided as attached pdf-file
Speaker: Mr Mario Schwarz (TUM)
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Symmetries: eDM
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Progress towards the TRIUMF ultracold neutron facility and neutron electric dipole moment experiment 30m
The TUCAN collaboration is building a next generation ultracold neutron (UCN) source, based on spallation neutron production using protons from TRIUMF's 500 MeV cyclotron. A large cold neutron flux is created via moderator shells of room-temperature heavy water and 20-K liquid deuterium surrounding a near-spherical volume of superfluid liquid helium-4. At around 1 K, the ultracold neutrons created in the superfluid have a long enough lifetime to be extracted to experiments using vacuum neutron guides.
The UCN will be used to search for the electric dipole moment (EDM) of the neutron using Ramsey's technique of separated oscillatory fields. The TUCAN EDM experiment will be operating at room temperature and using a double cell arrangement. A state-of-the-art magnetically shielded room will keep the main systematic effects caused by field inhomogeneity and instabilty low. Due to this and the large UCN yield expected from our source, we anticipate to reach a statistical sensitivity of 1e-27 ecm (1-sigma) within 400 days of beam time.
The presentation will cover the physics principles of source and experiment, and give an update on the design, status and plans.
Speaker: Dr Rüdiger Picker (TRIUMF)
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Coffee Break 40m
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Symmetries: eDMConvener: Ben Sauer
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JEDI and beyond – the quest for EDMs of charged particles 30m
abstract provided as attached pdf-file
Speaker: Dr Aleksandra Wrońska (Jagiellonian University in Kraków) -
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Perspectives of EDM searches in Atoms and Molecules 30mSpeaker: Lorenz Willmann (University of Groningen/ NL)
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Future FacilitiesConvener: Ben Sauer
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Systematic effects in the search of the muon electric dipole moment using the frozen-spin technique 25m
At the Paul Scherrer Institute we are developing of a high precision instrument to measure the muon electric dipole moment (EDM) using the frozen-spin technique. The presence of a permanent EDM in an elementary particle implies Charge-Parity symmetry violation and, within the context of the Standard Model, the electric dipole moment of elementary particles is extremely small. However, many Standard Model extensions predict large electric dipole moments. Recently, the muon electric dipole moment has become a topic of particular interest due to the tensions in the magnetic anomaly of the muon and the electron and hints of lepton-flavor universality violation in B-meson decays. The frozen-spin method suppresses the anomalous precession of the muon spin, thus increasing the signal-to-noise ratio for signals due to an EDM allowing to reach a sensitivity that is unattainable by conventional g-2 muon storage rings. With this technique the expected statistical sensitivity for the EDM after a year of data taking is 6 x 10-23 e·cm with the
p = 125 MeV/c muon beam available at the PSI. To reach this goal it is necessary to perform a comprehensive analysis on spurious effects that mimic the EDM signal. This work discusses a quantitative analysis of systematic effects for the frozen-spin method applied to the search of the muon EDM. Specifications of the required control of the precision of electric and magnetic fields as well as the detection efficiencies of the detectors were analytically derived and validated by simulation.Speaker: Chavdar Dutsov
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Symmetries: Hadronic reactionsConvener: Prof. Claude Amsler (Austrian Academy of Sciences (AT))
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Discrete symmetry tests using hyperon-antihyperon pairs at BESIII 30m
The hyperons from charmonia decays are produced with a non-zero spin polarization that is described by one global parameter in electron-positron annihilation into hyperon-antihyperon pair. This provides a method to measure precisely parity-violating (anti)hyperon decay amplitudes and directly test CP violation. These CP tests were performed for J/psi decays into Lambda Lambdabar, Sigma+ Sigmabar-, Xi Xibar and psi(2S) into Omega- Omega-bar+. For the Xi -> Lambda pi decay chain, the exclusive measurement allows for three independent CP tests and the determination of the strong and weak phase differences. Thanks to the large datasets in the tau-mass region, including the world's largest data samples at the J/psi and psi(2S) resonances collected at the BESIII experiment, the multi-dimensional analyses making use of polarization and entanglement have been performed for these processes. In the presentation the methods, the recent BESIII results and a roadmap for further CP-violation studies in hyperon decays will be discussed.
Speaker: Andrzej Kupsc (Uppsala University) -
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Symmetries in charm mesons and baryons from Belle/Belle II 30m
We present recent results of charm $CP$ symmetry violation (CPV) based on about 1 ab$^{-1}$ collected at the Belle experiment, including the decay asymmetry parameters ($\alpha$) and $\alpha$-included $CP$ asymmetry ($A_{CP}^{\alpha}$) for decays of $\Lambda_c^+$ and $\Xi_c^0$ baryons, search for CPV via time-integrated $CP$ asymmetry in $D$ three-body decays and T-odd asymmetry in $D$ four-body decays, lepton flavor universality test in $\Xi_c^0$ and $\Omega_c^0$ semileptonic decays, etc. We also introduce the status of Belle II and prospects of charm CPV.
Speaker: Dr Longke Li -
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Recent results on T, CP and CPT tests with KLOE-2 30m
KLOE and KLOE-2 full data sample, corresponding to 8 fb−1, has been collected at the Frascati DAΦNE φ–factory of INFN Laboratories and repre- sents the world largest data sample of this kind: about 2.4 × 1010 φ mesons and 8 × 109 K0K ̄ 0 entangled pairs. The neutral kaon system has unique properties such as entanglement, flavour oscillations, charge-parity (CP) and time-reversal (T) violation allowing us to test quantum mechanics coherence and fundamental discrete symmetries T, CP, CPT at the utmost sensitivity. KLOE-2 Collabo- ration just published a study on the quantum interference between the decays of entangled neutral kaons in the φ → KSKL → π+π−π+π− process by using KLOE data statistics of about 1.7 fb−1 . This channel exhibits the characteris- tic Einstein–Podolsky–Rosen correlations that prevent both kaons to decay into π+π− at the same time. It constitutes a unique tool for testing and constrain, at an unprecedented precision, parameters of various theoretical models, and to search for tiny decoherence and CPT violation effects which may arise, in a quantum gravity picture, due to space-time fluctuations at Planck scale. With the same data sample, KLOE-2 Collaboration is also performing the first di- rect test of the T and CPT symmetries in neutral kaon systems, by comparing neutral meson transition rates between flavour and CP eigenstates. The anal- ysis exploits the φ → KSKL → π+π−π∓e±ν and φ → KSKL → π∓e±ν 3π0 processes which allow to build discrete symmetry-sensitive observables and per- form model independent tests. Moreover, a new measurement of the KS → πeν branching fraction, using ∼ 1.6fb−1 of KLOE data, has been combined with the previous KLOE result (0.4 fb−1) improving the total precision by almost a factor of two, and allowing a new derivation of f+(0)|Vus|.
Speaker: Francesca Curciarello
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Coffee Break 30m
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Symmetries: MoleculesConvener: Lorenz Willmann
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A laser cooled beam of YbF for measuring the electron electric dipole moment 25m
Abstract in pdf
Speaker: Ben Sauer -
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Searches for CP-violating effects with YbF molecules 25m
abstract provided as attached pdf-file
Speaker: Christopher Ho
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Symmetries and Interactions: QCDConvener: Lorenz Willmann
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Chiral symmetry breaking: Current experimental status and prospects 30m
Chiral symmetry, linked to the smallness of the quark masses compared to the QCD bound states, and its breaking pattern are exploited in effective field theory to describe a multitude of phenomena by a few low-energy constants. Those concern light-meson dynamics and decays, their couplings to photons and meson-nucleon interactions. Special emphasis is given to the pion properties, in terms of pion-pion low-energy scattering, the pion polarizability and the chiral anomaly, which describes the coupling of three pions to a photon. These properties are studied by the COMPASS collaboration at CERN since first data taking with pion beams in the year 2004, and several following campaigns. In the framework of the upcoming AMBER collaboration, it is planned to extend the studies to the kaon sector.
Speaker: Jan Friedrich (Technische Universitaet Muenchen (DE))
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Lunch break 1h 40m
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Symmetries and Interactions: QEDConvener: Eberhard Widmann (Austrian Academy of Sciences (AT))
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Penning trap precision experiments for fundamental physics 30m
Experiments with single ions confined in a Penning trap enable access to a broad range of observables that are of fundamental importance for our understanding of fundamental physics. In the magnetic field of the trap, the cyclotron frequency of an ion can be determined with unique precision and gives direct access to the charge-to-mass ratio. Furthermore, we have access to the gyromagnetic g-factor via a measurement of the (Larmor) spin precession frequency. This way, we have determined a number of fundamental parameters, such as the electron, proton, neutron and deuteron atomic masses with leading precision.
Moreover, the continuous Stern-Gerlach effect gives us the possibility to determine the internal (spin-) state of the ion non-destructively. Consequently, we can measure the g-factors of almost arbitrary, also highly charged ions. Since the electric field found in such ions can reach extreme values up to 1016 V/cm, a comparison of the measured g with the prediction by theory yields the most stringent tests of quantum electrodynamics (QED) in strong fields. Recently, we have used our new generation experiment ALPHATRAP to push these measurements up until hydrogenlike tin 118Sn, where the field strength is two orders of magnitude higher than in any previous comparable measurements.
Also, our development of a novel technique to determine the g-factor difference of two simultaneously crystallized ions has led to a leap by two orders of magnitude on the precision frontier. With this technique, we have recently determined the isotopic effect of the g-factor in hydrogenlike neon ions, at 13 digits precision with respect to g and are consequently sensitive to previously invisible contributions, such as the QED recoil, and can set limits on hypothetical new physics such as dark matter mediated couplings.
Finally, the possibility to determine the internal state of a single ion gives us access to systems that were previously difficult to handle, such as the molecular hydrogen ions. Currently, we are performing spectroscopy on HD+ and soon H2+. The development of the necessary toolbox will be a seminal step towards a possible future spectroscopy of the antimatter equivalent, Hbar2-, which will enable a unique test of charge-parity-time (CPT) reversal symmetry.Speaker: Sven Sturm (Max-Planck-Gesellschaft (DE)) -
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Current status and latest results of the Mu-MASS experiment at PSI 30m
Being purely leptonic, i.e. made of constituents which have (to the best of our knowledge) no internal structure, Muonium (M) is an excellent candidate to probe b-QED. I will present our recent measurement of the n=2 M Lamb Shift of 1047.2(2.5) MHz, which comprises an order of magnitud improvement upon the last determinations and matches with theory within one sigma. This allows us to set limits on Lorentz and CPT violation in
the muonic sector, as well as on new physics coupled to muons and electrons which could provide an explanation of the muon g-2 anomaly. I will discuss the future prospects of such a measurement and the current status of the 1S-2S experiment.Speaker: Paolo Crivelli (ETH Zurich (CH))
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Symmetries: Leptonic reactionsConvener: Eberhard Widmann (Austrian Academy of Sciences (AT))
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Testing CP and CPT symmetries in ortho-positronium decays with J-PET detector 25m
In the talk we demonstrate test of combined charge, parity, and time-reversal transformation (CPT) in the annihilations of the lightest leptonic bound system, the positronium atom. With the Jagiellonian Positron Emission Tomograph (J-PET) we have collected an unprecedented range of kinematical configurations of exclusively-recorded annihilations of the positronium triplet state (ortho-positronium) into three photons. Employing a novel technique for estimation of positronuium spin axis on the basis of a single event, we determined the complete distribution of an angular correlation between spin and annihilation plane of ortho-positronium. We present recently published result of determined expectation value of this correlation at the precision level of $10^{-4}$, with an over three-fold improvement on the previous measurement.
Positronium being at the same time an eigenstate of the C and P operators is an unique probe to test the CP symmetry. This test is based on determination of polarization of photons from positronium annihilation. This allows exploration of a new class of discrete symmetry odd operators that were not investigated before. The novelty of the experimental setup is based on usage of plastic scintillators as active detection material and trigger-less data acquisition system. In the talk we describe a result of CP symmetry test at the precision level of $10^{-4}$ in a whole available phase-space and experimental techniques developed by the J-PET collaboration.Speaker: Aleksander Gajos -
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The MOLLER and P2 Experiments; High precision tests of the running of the Weak mixing angle 25m
The so called Standard Model is a phenomenological model, in the sense that it relies on experimental input and has been continuously refined, based on that input, for the better part of a century. It is generally accepted that the Standard Model is incomplete,for various reasons.
The Standard Model is a gauge theory, which produces floating parameters, called couplings, or "charges", for which the values can only be determined through measurement and that set the strength of a particular type of interaction (e.g. the Weak interaction). The MOLLER (Jefferson Lab) and P2 (Mainz MESA facility) experiments, are fully funded and currently in the development and construction phase. They aim to measure the so called "Weak-charge" of the electron and proton respectively to the highest precision yet. MOLLER and P2 exploit the fact that the Weak interaction violates parity (has a preferred handedness), which means it has the potential to uncover new, parity violating, interactions for electrons and protons (among other new physics sensitivities). The two measurements are complementary since they couple to potential new physics in different ways. I will explain the motivation for the experiments and give an overview of the design and the technologies it will use.
Speaker: Michael Gericke
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Coffee Break 30m
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Poster Session
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Symmetries: Parity testsConvener: Hartmut Abele (TU Wien)
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Low-energy experiments in search for new physics 30m
The high measurement precision attainable in experiments within the so-called low-energy, precision frontier can be employed to carry out a range of tests of fundamental physics and search for beyond-standard-model physics. After a brief overview of precision, low-energy tests, I will discuss two related experiments. In one of these, we study isotope shifts in an optical transition in ytterbium (Yb) [1], to check a hint for new physics that resulted from precision spectroscopy in ionic Yb [2] and help identify the origin of the possible new-physics signal. In another work, we study the effects of the weak force in atoms, through measurements of atomic parity violation in Yb [3]. Within this project, we aim to provide a test of the electroweak sector of the standard model, as well as study intra-nuclear weak forces and the distribution of neutrons in the Yb nucleus.
Speaker: Dionysis Antypas (Helmholtz Institut Mainz) - 09:30
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Fundamental Physics with Slow Neutrons 30m
Neutrons are electrically neutral and massive particles. They experience all known forces, which are electromagnetic, gravitation, weak, and strong forces. Slow neutrons with low kinetic energy are good tools for observing the effects of those interactions. They are used for various fundamental physics experiments, taking advantage of the property.
Depending on their kinetic energy, slow neutrons are called cold, very cold, and ultra cold neutrons. In this presentation, the property of such slow neutrons will be introduced. They are unique probes for exploring new physics beyond the standard model. I will also discuss the cutting-edge experiments using slow neutrons, such as neutron electric dipole moment searches, neutron lifetime measurements, gravity experiments, and so on.Speaker: Shinsuke Kawasaki
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Coffee Break 30m
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Symmetries: NeutrinosConvener: Prof. Livia Ludhova
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The quest for leptonic CP violation 30m
Particle/Antiparticle asymmetry (CP violation) was discovered almost six decades ago in quark bound states. CP violation was the only experimental evidence of matter and antimatter behaving differently in the Standard Model of particle physics. The discovery of neutrino oscillations at the end of the last century opened the window for similar phenomena in leptons. It has taken the neutrino community almost two decades to be able to start the exploration of this phenomenon using neutrino oscillations. The race for leptonic CP violation has already started with the running experiments T2K and NOvA and will provide definitve results with the new generation of experiments, Hyper-Kamiokande and DUNE. I will discuss the fundaments of CP violation in neutrinos, describe the experimental approaches and the main challenges faced by the experimental research community.
Speaker: Prof. Federico Sanchez (Universite de Geneve (CH)) -
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CPT invariance and neutrinos 30m
CPT symmetry, the combination of Charge Conjugation, Parity and Time reversal, is a cornerstone of our model building strategy and therefore the repercussions of its potential violation will severely threaten the most extended tool we currently use to describe physics, i.e. local relativistic quantum fields. However, limits on its conservation from the Kaon system look indeed imposing. In this talk I will show that neutrino oscillation experiments can improve this limit by several orders of magnitude and therefore are an ideal tool to explore the foundations of our approach to Nature.
Speaker: Gabriela Barenboim (University of Valencia & IFIC (UV-CSIC))
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Symmetries and Interactions: NeutrinosConvener: Prof. Livia Ludhova
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Sterile neutrinos with the KATRIN Experiment, current status and prospects 30m
The KATRIN experiment is designed to measure the mass of the electron anti-neutrino by investigating the energetic endpoint of the tritium spectrum. KATRIN recently release it’s latest results and is the rst direct experiment to report a sub-eV neutrino mass limit. As a complementary result, KATRIN also reported its rst limits for eV-scale sterile neutrinos.
The TRISTAN (TRitium Investigation on STerile to Active Neutrino mixing) project aims at searching for keV-sterile neutrinos in the full beta decay spectrum of tritium using a novel detector system at the KATRIN experiment. This detector is now in production and the commissioning of the rst phase of the project is expected to begin in 2025. Thanks to the high tritium source activity of KATRIN a statistical sensitivity at the level of sin2θ ~ 10-6 can be reached.
In this talk, I will report the latest results of the KATRIN experiment and the on-going e orts to search for keV-sterile neutrino with TRISTAN.Speaker: Anthony Onillon (Laboratoire de Physique Subatomique et des Technologies Associe)
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Future Facilities: NeutrinosConvener: Prof. Livia Ludhova
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Status and Prospects of the DUNE and JUNO Experiments 30m
DUNE and JUNO are two leading next-generation neutrino experiments that will address some of the most important open questions in neutrino physics. DUNE is a long baseline experiment consisting of two detectors placed in what will be the world’s most intense neutrino beam: a near detector in Fermilab near the beam source, and a much larger far detector at the Sanford Underground Research Laboratory in South Dakota, 1300 km downstream. JUNO is an unprecedentedly large liquid scintillator detector placed at a baseline of 52.5 km from eight nuclear reactors in China. The physics goals of both experiments include making cutting-edge measurements of neutrino oscillations with unprecedented precision, studying astrophysical neutrinos, and searching for physics beyond the Standard Model such as a positive signal for nucleon decay. This talk will report the status and physics prospects of both experiments.
Speaker: Juan Pedro Ochoa Ricoux
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Conference Photo 10m
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Lunch break 1h 20m
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Fundamental interactions: NeutronsConvener: Hirohiko Shimizu (Nagoya University)
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Gravity studies with neutrons 30mSpeaker: Hartmut Abele (TU Wien)
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Symmetries: NeutronsConvener: Hirohiko Shimizu (Nagoya University)
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Measurement of the free neutron decay: status and prospects 30mSpeaker: Chen-Yu Liu (Indiana University)
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Symmetries: Magnetic momentsConvener: Hirohiko Shimizu (Nagoya University)
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The g-2 experiment at FNAL 30m
The Fermilab muon g-2 experiment recently released its first measurement of the positive muon magnetic moment anomaly, a_mu = (g_mu-2)/2 to an accuracy of 0.46 ppm. The anomaly a_mu is of interest since it can be predicted with impressive precision and its value is sensitive, via quantum corrections, to the interactions of the muon with the other particles of the Standard Model. Comparison of measurement results and theoretical predictions tests the completeness of the Standard Model, and a significant discrepancy would indicate the need for new physics. Details of the Fermilab experiment and its first result will be presented, along with a comparison with the theory and future prospects.
Speaker: David Kawall
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Symmetries and Interactions: Magnetic momentsConvener: Hirohiko Shimizu (Nagoya University)
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Measurement of the 𝜸𝜸 process in Pb+Pb collisions and constraints on the 𝝉-lepton anomalous magnetic moment with the ATLAS detector at LHC 30m
The ATLAS experiment has measured the 𝜏-lepton pair production in ultraperipheral lead–lead
collisions, Pb+Pb Pb(𝛾 𝜏𝜏)Pb. From this measurement, constraints on the 𝜏-lepton anomalous magnetic moment, 𝑎𝜏, have been extracted. The used dataset corresponds to an integrated luminosity of 1.44 nb-1` of LHC Pb+Pb collisions at 𝑠NN = 5.02 TeV recorded by the ATLAS experiment in 2018. Selected events contain one muon from a 𝜏-lepton decay, an electron or charged-particle track(s) from the other𝜏-lepton decay, little additional central-detector activity, and no forward neutrons. The 𝛾𝛾𝜏 𝜏
process is observed with a significance exceeding 5 standard deviations, assuming the Standard Model value for 𝑎𝜏. To measure 𝑎𝜏, a template fit to the muon transverse-momentum distribution from 𝜏-lepton candidates is performed, using a dimuon (𝛾𝛾 𝜇𝜇) control sample to constrain systematic uncertainties. The observed 95% confidence-level intervals for 𝑎𝜏 are 𝑎𝜏 (-0.058,-0.012 ) (-0.006. 0.025). These limits are compared with previous 𝑎𝜏 – measurements obtained at LEP and Belle electron-positron colliders.Speaker: Vincenzo Cavasinni (Universita & INFN Pisa (IT))
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Coffee Break 30m
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Guided Tour at the MAK Museum
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Conference dinner
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Symmetries: Matter-antimatter symmetryConvener: Paolo Crivelli (ETH Zurich (CH))
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The ALPHA Experiment 30mSpeaker: Andrew Evans (University of Calgary Dep. of Phys. and Astronomy (CA))
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The Base Experiment 30m
Throughout its existence, the Standard Model has proven very successful in describing fundamental interactions of elementary particles. However, the asymmetry between the abundance of matter and antimatter in the universe has yet to be understood.
The BASE experiment, located at CERN’s Antiproton Decelerator (AD) facility, measures the fundamental properties of protons and antiprotons to test CPT symmetry with high precision. In the past, the BASE collaboration has compared the charge-to-mass ratio of protons and antiprotons at a fractional precision of 16 parts-per-trillion (p.p.t.) [1]. Additionally, the first ever non-destructive observation of spin flips with a single trapped antiproton was demonstrated [2], allowing the measurement of the antiproton’s magnetic moment to a fractional precision of 1.5 parts-per-billion (p.p.b.) [3], which improved results by other groups by about a factor of 3000 [4].
Within this contribution I will present an overview over the BASE experiment and review the two-particle triple-trap measuring scheme that was used to measure the antiproton’s magnetic moment with a fractional precision of 1.5 p.p.b. I will review the main systematic limitations of this previous antiproton g-factor measurement, and present recently implemented experiment upgrades. These contain a dedicated cooling trap for ultra-fast sub thermal cooling cycles of the cyclotron modes, and the implementation of a magnetic shimming and shielding system for stabilization and homogenization of the magnetic field of the measurement trap. Together with the implementation of phase sensitive detection methods, these improvements will enable an antiproton g-factor measurement with a fractional uncertainty of 100 p.p.t.
[1] Ulmer, S. et al., Nature 601, 53-57 (2022)
[2] Smorra, C. et al., Phys. Lett. B 769, 1 (2017)
[3] Smorra, C. et al., Nature 550, 371 (2017)
[4] DiSciacca, J. et al., Phys. Rev. Lett. 110, 130801 (2013)Speaker: Stefan Erlewein (Max Planck Society (DE)) -
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The ASACUSA Experiment 30mSpeaker: Dr Daniel James Murtagh (Austrian Academy of Sciences (AT))
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Coffee Break 30m
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Fundamental interactions: QED&QCDConvener: Chiara Mariotti (INFN Torino (IT))
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The search for axion dark matter with a dielectric haloscope: MADMAX 30m
The QCD Axion is arguably the most elegant candidate to solve the strong CP problem and to explain missing dark matter in our universe. Some compelling theoretical models predict its mass to be around 100 μeV, a range that presently still evades experimental sensitivity. The dielectric haloscope concept has been proposed to change this. The motivation for post-inflationary dark matter axions with mass around 100 µeV will be discussed and the basic concepts of a dielectric haloscope will be introduced. The technological challenges to be solved in order to achieve the necessary sensitivity will be discussed on the basis of the MADMAX experiment.
Speakers: Bela Majorovits (MPI for Physics), Bela Alexander Majorovits (Max Planck Society (DE)) -
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LUXE: A new experiment to study non-perturbative QED in electron-LASER and photon-LASER collisions 30m
The LUXE experiment (LASER Und XFEL Experiment) is a new large-scale experiment in planning at DESY Hamburg. LUXE is intended to study collisions between a high-intensity optical LASER and 16.5 GeV electrons from the XFEL electron beam, as well as collisions between the optical LASER and GeV-scale, high-flux photon beams. The main physics objective of LUXE is to experimentally study processes of Quantum Electrodynamics (QED) in a non-perturbative regime, including quantum radiation reaction and Breit-Wheeler pair production in a strong background field. The proposed experiment will be the first to provide high-precision and high-statistics studies of these iconic phenomena in an unprecedented regime. An overview of the LUXE experimental setup will be given, with a discussion of the foreseen detector systems and their expected performance. Finally, the prospects for experimentally studying physics beyond the standard model will also be discussed.
Speaker: Gianluca Sarri (Queen's University Belfast)
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Best Poster Award - Ceremony 10m
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Lunch break 1h 20m
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Fundamental interactions: MassesConvener: Ralf Lehnert
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Origin of the Proton Mass 30m
Atomic nuclei lie at the core of everything we can see; and at the first level of approximation, their atomic weights are simply the sum of the masses of all the neutrons and protons (nucleons) they contain. Each nucleon has a mass mN ≈ 1 GeV, i.e. approximately 2000-times the electron mass. The Higgs boson - discovered at the large hadron collider in 2012 - produces the latter, but what generates the masses of the neutron and proton? This is a pivotal question. The answer is widely supposed to lie within quantum chromodynamics (QCD), the strong-interaction piece of the Standard Model. Yet, it is far from obvious. In fact, removing Higgs-boson couplings into QCD, one arrives at a scale invariant theory, which, classically, can't support any masses at all. This presentation will sketch forty years of developments in theory that suggest a solution to the puzzle and highlight an array of experiments that can validate the picture.
Speaker: Craig Roberts (Nanjing University)
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Fundamental interactionsConvener: Ralf Lehnert
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Recent Higgs boson analysis results 30m
The latest results on the Higgs boson properties from the ATLAS and CMS experiments will be reviewed, 10 years after its discovery and
with 30 times larger statistics.
Searches of Higgs boson pair production will be presented.
In addition a few projections for the end of the high luminosity operation of the LHC will be shown.Speaker: Chiara Mariotti (INFN Torino (IT))
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Symmetries: BSMConvener: Ralf Lehnert
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Fermion number violation with heavy neutrinos 30m
Three mysteries stand after the discovery of the Higgs boson: (i) the
origin of the masses of the neutrinos; (ii) the origin of the baryon
asymmetry in the universe; and (iii) the nature
of dark matter. High energy colliders provide an exciting opportunity to
resolve these mysteries with the possible discovery of heavy neutral
leptons (HNLs), both at the HL-LHC from neutrinos produced in
semi-leptonic decays, or at a later stage using the large sample
(510^12) of Z bosons with 20% neutrino decay fraction, produced in
circular e+e- Higgs factories running at the Z pole.The mixing between light and heavy neutrinos is expected to be very
small, resulting in very long lifetimes for the HNL, and in spectacular
signal topology. Even from Z decays, although the final state in this
reaction appears to be charge-insensitive, it is possible to distinguish
the Dirac vs Majorana nature of the neutrinos, by a variety of methods
that will be discussed. A Majorana nature could have considerable
implication for the generation of the Baryon Asymmetry of the Universe.Speaker: Alain Blondel (Universite de Geneve (CH))
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Coffee Break 30m
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Symmetries: BSMConvener: Eberhard Widmann (Austrian Academy of Sciences (AT))
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Standard-Model Extension 30m
Lorentz and CPT symmetry represent cornerstones of our present understanding of nature, but may be violated in various theoretical approaches to underlying physics. Testing these symmetries therefore establishes a promising avenue to search for physics beyond the Standard Model. The canonical theoretical tool to identify possible experimental signatures of such violations is an effective-field-theory framework known as the Standard-Model Extension. This talk provides an overview of this topic with focus on efforts involving low-energy atomic and subatomic systems.
Speaker: Ralf Lehnert -
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Tests of physics beyond the Standard Model with the g factor of few-electron ions 30m
In this contribution, we discuss the precision theory of the bound-electron g factor. This quantity can be measured nowadays to high precision with the combination of Penning traps and electron beam ion traps. The collaboration of theory and experiment enables impactful and detailed tests of quantum electrodynamics in a strong background field, and a competitive determination of fundamental constants [1] and nuclear properties [2]. Very recently, we have shown that such studies also allow to test certain extensions of the Standard Model of particle physics, and set bounds on the strength of a hypothetical fifth force [3,4]. We summarize our ongoing calculations of radiative corrections in the non-perturbative Coulomb potential, which are necessary for further improvements in this field.
[1] H. Cakir, N. S. Oreshkina, I. A. Valuev et al., arXiv:2006.14261 (2021); V. A. Yerokhin, E. Berseneva, Z. Harman et al., Phys. Rev. Lett. 116, 100801 (2016).
[2] A. Schneider, B. Sikora, S. Dickopf et al., Nature 606, 878 (2022).
[3] V. Debierre, C. H. Keitel, Z. Harman, Phys. Lett. B 807, 135527 (2020); arXiv:2202.01668 (2022); V. Debierre, Natalia S. Oreshkina, Igor A. Valuev, Z. Harman, C. H. Keitel, arXiv:2207.04868 (2022).
[4] T. Sailer, V. Debierre, Z. Harman et al., Nature 606, 479 (2022).Speaker: Dr Zoltan Harman (Max Planck Institute for Nuclear Physics) -
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Novel mechanisms of electric dipole moments in atoms and molecules 30m
I discuss novel mechanisms for the generation of electric dipole moments in atoms and molecules, including via the exchange of low-mass axionlike particles between atomic electrons and nucleons [1,2], as well as via two-photon exchange processes between atomic electrons and the nucleus in paramagnetic systems [3]. I also discuss how oscillating electric dipole moments may be induced by an oscillating-in-time axionlike dark matter field [3,4]. Such oscillating electric dipole moments have recently been sought by using ultracold neutrons [5] and HfF+ molecular ions [6].
References
[1] Stadnik, Dzuba and Flambaum, Physical Review Letters 120, 013202 (2018).
[2] Dzuba, Flambaum, Samsonov and Stadnik, Physical Review D 98, 035048 (2018).
[3] Flambaum, Pospelov, Ritz and Stadnik, Physical Review D 102, 035001 (2020).
[4] Stadnik and Flambaum, Physical Review D 89, 043522 (2014).
[5] Abel et al. (nEDM collaboration), Physical Review X 7, 041034 (2017).
[6] Roussy et al., Physical Review Letters 126, 171301 (2021).Speaker: Dr Yevgeny Stadnik (Kavli IPMU, University of Tokyo)
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Public Lecture @ Austrian Academy of Sciences 2hSpeaker: Prof. Stephan Paul (Technische Universitat Munchen (DE))
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Fundamental interactions: Lorentz invarianceConvener: Martin Simon (Austrian Academy of Sciences (AT))
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Symmetry tests with clocks 30m
We use frequency comparisons between highly accurate optical clocks for tests of fundamental principles. In particular, the 171Yb+ optical clock based on an electric octupole transition between the S-ground state and the lowest excited F-level (radiative lifetime 1.58 yr) provides a favorable combination of low systematic uncertainty and high sensitivity to relativistic effects and potential new physics. Using this system we have established improved limits for violations of Lorentz invariance in the electron sector and for violations of local position invariance, including the presently most stringent limits for temporal variations of the fine structure constant and the electron-proton mass ratio [1]. I will give an outlook on the development of a 229Th nuclear optical clock that will open new perspectives for fundamental tests in the domain of nuclear physics [2].
[1] R. Lange, N. Huntemann, J. M. Rahm, C. Sanner, H. Shao, B. Lipphardt, Chr. Tamm, S. Weyers, and E. Peik, “Improved limits for violations of local position invariance from atomic clock comparisons”, Phys. Rev. Lett. 126, 011102 (2021).
[2] E. Peik, T. Schumm, M. Safronova, A. Palffy, J. Weitenberg, P.G. Thirolf, „Nuclear clocks for testing fundamental physics”, Quantum Sci. Technol. 6, 034002 (2021).Speaker: Ekkehard Peik (Physikalisch-Technische Bundesanstalt, Braunschweig, Germany)
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Application of new technologiesConvener: Martin Simon (Austrian Academy of Sciences (AT))
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Extreme precision magnetometry 30m
Searches for electric dipole moments (EDM), axion-like particle searches, ultra-cold atom experiments in space, atomic fountains or a new neutron-antineutron oscillation search at the European Spallation Source require precisely characterized and also very small magnetic fields. Some of these experiments actually are the most accurate and precise magnetic field sensors ever built.
Developments triggered by gradient-induced so-called “geometric phase” effects in the PanEDM experiment to search for the neutron EDM, the magnitude of magnetic fields over cubic meter dimensions has been reduced to few 10-12 T, with noise below 10-15 T and a stability of 10-14 T over several 100 s.
At this level of precision, it is difficult to disentangle properties of the magnetic field from the behavior of a probe to actually measure the field. In this talk I will discuss the state-of-the-art in small magnetic field research: (i) the best magnetic fields outside of superconductors and the level of understanding of how to generate and control these fields; (ii) recent advances of sensors to measure magnetic field stability and a 129-Xe EDM experiment with a sensitivity of 10-44 eV sensitivity, as well as a novel electrostatic storage ring to search for axion-like particles at TUM; (iii) transfer of these technologies being transferred to applications, in particular an example where a new diagnostic method for fetal heart diseases using atomic magnetometry has recently been developed.
Speaker: Peter Fierlinger (TU München) -
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Ultra-precise mass measurements for fundamental studies 30m
The Penning-trap mass spectrometer PENTATRAP [1] located at the Max Planck Institute for Nuclear Physics in Heidelberg is able to determine mass-ratios of highly charged ions of long-lived nuclides with a relative uncertainty of a few ppt [2, 3]. With a broad measurement program PENTATRAP did and continues to contribute to several fields of physics, e.g. test of bound-state QED [2] with direct measurements of binding energies and meta stable electronic states, neutrino-physics [3] and test of special relativity [4] by determining Q-values of nuclear reactions and 5th force research [5,6] with mass-ratios of isotope chains. Achieving ppt-precision requires a cryogenic ion trapping system in a stabilized, cold-bore 7 T superconducting magnet as well as applying image-current detection systems with single-ion phase-sensitive detection methods. Highly charged ions provided by external ion sources increase detector signal-to-noise as well as measurement precision due to higher frequencies. Simultaneous measurements in two traps allow for direct crosschecks of systematic effects. Presented will be the latest results and the status of the experiment.
[1] Repp, J. et al., Appl. Phys. B 107, 983 (2012).
[2] Schüssler, R.X. et al., Nature 581, 42–46 (2020).
[3] Filianin, P. et al., Phys. Rev. Lett. 127, 072502 (2021).
[4] Rainville, S. et al., Nature 483, 1096 (2005).
[5] Counts, I. et al., Phys. Rev. Lett. 125, 123002 (2020).
[6] Rischka, A. et al., Phys. Rev. Lett. 124, 113001 (2020).Speaker: Menno Door (MPIK Heidelberg)
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Future FacilitiesConvener: Martin Simon (Austrian Academy of Sciences (AT))
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Future facilities at PSI, the High - Intensity Muon Beams (HIMB) project 30m
Currently PSI delivers the most intense continuous muon beam in the world with up to a few 10^8 μ+/s. The High Intensity Muon Beam (HiMB) project aims at developing a new target station and muon beam lines able to deliver 10^10 μ+/s, with a huge impact for low-energy, high-precision muon experiments.
While the next generation of proton drivers with beam powers in excess of the current limit of 1.4 MW still requires significant research and development, the focus of HiMB is to improve the surface muon yield with a new target geometry and to increase capture and transmission with a solenoid-based beamline in order reach a total efficiency of approximately 10%.
We present the current status of the HiMB project.Speaker: Giovanni Dal Maso
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Coffee Break 30m
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Future Facilities: MuonConvener: Johann Zmeskal (Austrian Academy of Sciences (AT))
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Future facilities in muon research at J-PARC 30m
abstract provided as attached pdf-file
Speaker: Takayuki Yamazaki -
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Precise measurements of fundamental quantities of muon at J-PARC 30m
Various measurements aiming at the precise determination of the fundamental physical quantities of muons (mass, magnetic moment) are underway at the J-PARC Materials and Life Science Experimental Facility, Muon Facility (MUSE). These include muonium HFS and 1s-2s measurements, HFS measurements of muonic helium and muon trapping. Preliminaries results have already been obtained for the first two. This talk will report on the current status and future prospects activities
Speaker: koichiro shimomura (KEK) -
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Status of the COMET experiment 30m
COMET is an experiment at the Japan Proton Accelerator Research Complex (J-PARC), which will search for coherent neutrinoless tran- sition of muons to electrons in the coulomb eld of atomic nuclei (𝜇− + N → 𝑒− + N). Since this process violates charged lepton avor conservation it is highly suppressed in the Standard Model and thus provides a promising channel to probe new physics.
In order to realize the stringent requirements on detector system and muon beam the COMET experiment will follow a staged approach.
Phase-I is currently under construction at J-PARC and is aiming to improve the current branching ratio limit of 7×10−13 by two orders of magnitude. On top of the physics measurement a precise muon beam measurement will be conducted.
In Phase-II the branching ratio limit will be additionally improved by at least two orders of magnitude. Re nements of the experimental design based on ongoing investigations and experience gained from Phase-I will be used to push this even further for a total improvement of ve orders of magnitude.
This talk will give an experimental overview of both phases, along with recent updates of the facility and the current detector develop- ment status.Speaker: Mr Andreas Jansen (TU Dresden, Institut für Kern- und Teilchenphysik)
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Closing remarks
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Closing remarks 20m
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