Bulletin of the American Physical Society
88th Annual Meeting of the Southeastern Section of the APS
Volume 66, Number 16
Thursday–Saturday, November 18–20, 2021; University Center Club, Florida State University, Tallahassee, Florida
Session Q03: Dark Matter and Physics Beyond the Standard Model |
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Chair: Kohsaku Tobioka, Florida State University Room: West Ballroom |
Saturday, November 20, 2021 9:00AM - 9:30AM |
Q03.00001: Solving Big Mysteries in Particle Physics with a New Force Invited Speaker: Nobuchika Okada In particle physics, the so-called Standard Model has been known as the best theory for describing elementary particle phenomena observed in Nature. However, there are big mysteries that the Standard Model cannot explain: (1) Why are neutrino masses so tiny? (2) What is the nature of the dark matter in the Universe? (3) What drives the Cosmic Inflation before Big Bang? (4) What is the origin of the asymmetry between ordinary matter and antimatter in the Universe? (5) Why is the CP-violation so small in the Strong Interaction? In this talk, I will discuss a simple extension of the Standard Model with a new force that offers a solution to the above 5 mysteries. [Preview Abstract] |
Saturday, November 20, 2021 9:30AM - 10:00AM |
Q03.00002: Superfluid Effective Field Theory for Dark Matter Direct Detection Invited Speaker: Wei Xue I will present an effective field theory (EFT) framework for superfluid 4He to model the interactions among quasiparticles, helium atoms and probe particles. The presented EFT framework and results can be used to understand the dynamics of thermalization in the superfluid, and can be further applied to sub-GeV dark matter direct detection with superfluid 4He. [Preview Abstract] |
Saturday, November 20, 2021 10:00AM - 10:30AM |
Q03.00003: Dark Matter at Accelerators - the Heavy Photon Search and the Light Dark Matter eXperiment Invited Speaker: Matthew Solt The constituents of dark matter are still unknown, and the viable possibilities span a very large mass range. Specific scenarios for a thermal origin of dark matter sharpen this mass range to within about an MeV to 100 TeV. Most of the stable constituents of known matter have masses in the MeV to GeV range, and a thermal origin for dark matter works in a simple and predictive manner in this mass range as well, yet it remains largely unexplored. Two complementary fixed target experiments that use a primary electron beam and have unique sensitivity to models of light DM in the this mass range are the Heavy Photon Search (HPS) at Jefferson Lab and the planned Light Dark Matter eXperiment (LDMX) at SLAC. HPS searches for visibly decaying dark photons through two distinct methods – a resonance search in the e+e- invariant mass distribution and a displaced vertex search for long-lived dark photons. LDMX searches for invisibly decaying dark photons through a missing-momentum experiment. This contribution will give an overview of the theoretical motivation, the main experimental challenges on LDMX and HPS and how they are addressed, the projected sensitivities in comparison to other experiments, and preliminary results of the HPS displaced vertex search for the 2016 Engineering Run. [Preview Abstract] |
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