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Workshop on BSM Physics at Eta-Factories

13–16 May 2025
Lund University Fysiska Institutionen, Sweden
Europe/Stockholm timezone

Contact: Corrado Gatto, Marcin Zieliński

Contribution List

36 out of 36 displayed
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  1. 18. Welcome and introduction
    Andrzej Kupsc, Bastian Kubis (University of Bonn (DE)), Johan Bijnens (Lund University), Sean Tulin (York University)
    13/05/2025, 08:30
  2. 25. Anomalies in Particle Physics
    Andreas Crivellin (University Bern)
    13/05/2025, 09:00
  3. 22. Opportunities for non-perturbative QCD at future high intensity eta/eta' factories
    Emilie Passemar
    13/05/2025, 10:00
  4. 17. Perspectives on C and CP violation in eta to 3pi decay from SMEFT
    Dr Jun Shi (South China Normal University), Susan Gardner (University of Kentucky)
    13/05/2025, 11:00

    The decay $\eta\to\pi^+\pi^- \pi^0$ is an ideal channel in which to study flavor-conserving $C$ and $CP$ violation beyond the Standard Model. We use Standard Model Effective Field Theory (SMEFT) to deduce the mass-dimension-six operators that can contribute to its signature, i.e., an observed breaking of mirror symmetry in its Dalitz plot. Using chiral-effective theory, we present the leading...

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  5. 1. CP-violation in (semi)leptonic η decays within the SMEFT framework
    Dr PABLO SÁNCHEZ PUERTAS (University of Granada)
    13/05/2025, 11:30

    Currently and in the near future, a variety of $\eta$ factories are exploring the potential to search for new physics through different $\eta$ decays. One possibility being considered is to search for signs of CP-violation in eta decays. Since the Standard Model predicts an extremely suppressed rate for CP-violation in the $\eta$ sector, any positive signal would be a clear sign of new...

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  6. 24. Status of eta, eta-prime lattice studies
    Konstantin Ottnad (University of Mainz)
    13/05/2025, 13:30
  7. 11. JLab Eta Factory
    Prof. Liping Gan (University of North Carolina Wilmington)
    13/05/2025, 14:00

    The system of η and η′ offers a flavor-conserving laboratory to test the low-energy QCD and to search for new physics Beyond the Standard Model. The symmetry properties of QCD at low-energy, such as the chiral symmetry or the axial anomalies, are manifested in the decays of η and η′. Thus, a study of η/η′ will yield light on our understanding of the origin and the dynamics of QCD...

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  8. 12. eta decays at KLOE/KLOE-2 and prospect at the future e+e- collider
    xiaolin Kang
    13/05/2025, 14:30

    The talk will include recent progress and insights on eta/eta' decays at KLOE/KLOE2 and the propest in this field that could be achieved with the future e+e- collider proposed like STCF.

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  9. 23. On general parameterization for the hadronic form factors
    PABLO SÁNCHEZ PUERTAS (University of Granada)
    13/05/2025, 15:30
  10. 20. LFV eta/eta' decays and their relation to mu -> e conversion in nuclei
    Frederic Noël
    13/05/2025, 16:00
  11. 19. New Physics near a GeV
    David McKeen (TRIUMF)
    14/05/2025, 08:30
  12. 9. Dark photon portal to dark matter, long-lived particles and gravitational waves
    Felix Kahlhoefer (Karlsruhe Institute of Technology)
    14/05/2025, 09:30

    Dark photons arising at or below the GeV scale from a spontaneously broken gauge symmetry are one of the simplest and most exciting extensions of the Standard Model. They couple to known particles via kinetic mixing with the Standard Model gauge bosons and can act as mediators between visible matter and new hidden states, such as sub-GeV dark matter particles. I will show that these models can...

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  13. 27. HV-MAPS Detectors in HEP Experiments
    Frank Simon (KIT - Karlsruhe Institute of Technology (DE))
    14/05/2025, 10:00
  14. 28. Huizhou Hadron Spectrometer (HHaS)
    Hao Qiu
    14/05/2025, 11:00
  15. 29. ESS Facility
    Johan Bijnens (Lund University), Valentina Santoro (ESS)
    14/05/2025, 11:30
  16. 16. The Jefferson Lab Eta Factory Experiment and Applications of PbWO₄ Calorimeters in Future Experimental Facilities
    Dr Alexander Somov (Jefferson Lab)
    14/05/2025, 13:30

    The goal of the new JLab Eta Factory (JEF) experiment, conducted with the GlueX detector in Hall D at Jefferson Lab, is to perform measurements of various $\eta^{(\prime)}$ decays with a primary focus on rare neutral modes. The experiment's physics program ranges from precision tests of low-energy QCD to searches for gauge bosons with masses below 1 GeV that could couple the Standard Model...

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  17. 21. Overview of the High-Intensity Heavy-Ion Accelerator Facility (HIAF) in China
    HE ZHAO (Institute of Modern Physics)
    14/05/2025, 14:00
  18. 31. Studies of Exclusive η Production with HADES
    Szymon Treliński
    14/05/2025, 14:30

    Proton-proton collisions at 4.5 GeV beam kinetic energy, measured with
    the High Acceptance Di-Electron Spectrometer (HADES) operating at GSI
    Helmholtzzentrum have been used to study exclusive η meson production.
    This energy range is particularly interesting as it lies in an
    intermediate regime — between near-threshold energies, where effective
    Lagrangian models are typically applied, and...

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  19. 30. NA64 hadron mode: Search for η and η’ to invisible decays
    Marco Ayala (SAPHIR - UNAB)
    14/05/2025, 15:30
  20. 7. Pseudoscalar mesons and emergent phenomena in QCD
    Khépani Raya Montaño
    14/05/2025, 16:00

    The structural properties of pseudoscalar mesons are closely linked with QCD's emergent phenomena, confinement and emergent hadronic mass, as well as to fundamental symmetries of the Standard Model. Two-photon transition form factors (TFFs) offer an efficient way to explore these phenomena, while tracing the transition between soft and hard energy scales. Moreover, these form factors are...

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  21. 32. New Particles, opportunities and perspectivesFocus on Eta’s
    Maxim Pospelov
    15/05/2025, 08:30
  22. 35. eta/etaprime physics at BESIII
    Shuangshi Fang
    15/05/2025, 09:30
  23. 26. The REDTOP experiment: a η/η′ factory to explore dark matter and physics beyond the Standard Model
    Dr Marcin Zielinski (Jagiellonian University (PL))
    15/05/2025, 10:00
  24. 33. Pseudoscalar transition form factors and $P \to \gamma\gamma$ decays from Lattice QCD
    Antoine Gérardin (CPT Marseille)
    15/05/2025, 11:00
  25. 10. eta(') transition form factors, the muon g-2, and beyond
    Simon Holz (Universität Bern)
    15/05/2025, 11:30

    The uncertainty of the Standard Model prediction of the anomalous magnetic moment of the muon $(g-2)_\mu$ is dominated by hadronic contributions. As part of these hadronic inputs, the pseudoscalar-pole contribution in hadronic-light-by-light scattering plays a vital role. The currently sought precision of the Standard Model prediction of $(g-2)_\mu$ requires a careful evaluation not only of...

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  26. 34. The process eta(') --> l+l- and pseudoscalar/axialvector mediators
    Bai-Long Hoid
    15/05/2025, 13:30
  27. 13. Rare eta meson decays at the CMS experiment
    Federica Maria Simone (Universita e INFN, Bari (IT))
    15/05/2025, 14:00

    Novel trigger strategies, combined with the large proton-proton collision datasets collected by the CMS experiment, have extended its sensitivity to rare flavor decay processes. Leveraging CMS’s ability to efficiently trigger on and reconstruct low-momentum muons, the experiment offers complementary sensitivity to rare meson decays.

    This contribution presents recent results on η meson...

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  28. 14. Low-scale dark sectors motivated by the evidence of a stochastic gravitational waves background
    Dr Michele Lucente (University of Bologna)
    15/05/2025, 14:30

    The recently reported evidence of a Stochastic Gravitational Wave Background (SGWB) in the nHz frequency range is in tension with standard astrophysical expectations, motivating the study of new physics beyond the Standard Model. A preferred explanation relies on a supercooled first order phase transition at the 100 MeV - GeV scale. I will present a minimal model that can account for the SGWB,...

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  29. 8. Theoretical calculation in the anomalous sector
    Karol Kampf (Charles University (CZ))
    15/05/2025, 15:30

    This talk will provide an overview of the precise higher-order calculation in the anomalous sector. The focus will be on the two-photon decays for pion and eta and on the corresponding Dalitz decays.

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  30. 2. Leptophobic $B$-boson searches through $\eta^{(\prime)}\to\pi^0\gamma\gamma$ and $\eta^{\prime}\to\eta\gamma\gamma$ decays
    Dr Emilio Royo (Universidad Cardenal Herrera CEU and IFAE)
    16/05/2025, 09:00

    We analyse vector, scalar and tensor meson-exchange contributions to the doubly radiative decays $\eta^{(\prime)}\to\pi^0\gamma\gamma$ and $\eta^{\prime}\to\eta\gamma\gamma$, and investigate the sensitivity of these processes to a leptophobic $B$ boson in the sub-GeV mass range. Our results are relevant for measurements of these decays at existing (A2, BESIII, KLOE-2) and forthcoming...

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  31. 6. Sub-GeV leptophobic B-boson exchange in $\phi\rightarrow\pi^0\eta\gamma$ decays
    Alejandro Miranda (IFAE)
    16/05/2025, 09:30

    The sensitivity of the rare decay process $\phi\rightarrow\pi^0\eta\gamma$ to signatures of a leptophobic boson in the MeV-GeV mass range is analyzed in this talk. First, we improve the description of the dominant scalar contribution. Next, we incorporate an explicit B-boson resonance exchange alongside the Standard Model (SM) contributions from vector and scalar meson exchanges. By utilizing...

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  32. 5. Axio-hadronic $\eta/\eta^{\prime}$ decays
    Sergi Gonzalez-Solis (University of Barcelona)
    16/05/2025, 10:00

    With upcoming $\eta/\eta^{\prime}$ factories in the horizon, dedicated searches for hadronic ALPs would open a new window into the exploration of strong CP solutions and low scale dark sectors. In this talk, we present branching ratio sensitivities of the axio-hadronic $\eta/\eta^{\prime}\to\pi\pi a$ decays, where $a$ is an axion or axion-like particle (ALP), using the leading order ALP-ChPT...

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  33. 37. Whither studies of eta to pi pi --- probes of CP violation or of dark sectors?
    Susan Gardner (University of Kentucky)
    16/05/2025, 11:00
  34. 38. Search for Axion-Like-Particles in the η->pi+pi-e+e- decay with the HADES Detector
    Krzysztof Prościński (Jagiellonian University)
    16/05/2025, 11:30
  35. 3. Probing axion-like particles with different coupling pattern at eta-factories
    Maksym Ovchynnikov (CERN)

    In this talk, I present a comprehensive discussion on how to search for generic axion-like particles (ALPs) coupled to quarks and gluons at Eta-Factories. First, I will review the phenomenology of the ALPs in the GeV mass range, and highlight existing open questions and complications in the field. Then, I will proceed with calculating the yields of ALPs from decays of pi0, eta, eta' mesons,...

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  36. 39. Whither studies of eta to pi pi --- probes of CP violation or of dark sectors?
    Susan Gardner (University of Kentucky)

    The decay rate for $\eta\to \pi\pi$ is known to be vanishingly small in the SM, and it is similarly so in the presence of strong CP violation. Here we consider whether new sources of CP violation, as encoded in SMEFT, or the emission of a dark-sector particle, such as the axion, can give rise to potentially observable effects $-$ and how the two mechanisms might be distinguished.

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