Bulletin of the American Physical Society
Far West Section Fall 2021 Meeting
Volume 66, Number 12
Friday–Saturday, October 29–30, 2021; Virtual
Session L02: HEP and Acc -2 |
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Saturday, October 30, 2021 10:00AM - 10:12AM |
L02.00001: Argon Recoil Ionization and Scintillation for Electronic Recoils (ARIS-ER) Sydney Ostrom Low-energy dark matter electron recoils are not well understood in liquid argon (LAr), mainly due to a lack of measurements. The Argon Recoil Ionization and Scintillation for Electronic Recoils (ARIS-ER) experiment will measure the response of LAr to electronic recoils down to 1 keV and implement the response model in Geant4. ARIS-ER will use 511keV gammas from a Na-22 source to induce electronic recoils in LAr via Compton scattering in the TPC. A high-resolution germanium detector will measure the energy of the scattered gamma. This study is crucial to dark matter searches that use LAr, like DarkSide-20k, to identify sub-GeV dark matter-electron scattering events and to better understand backgrounds to dark matter-nucleon scattering. [Preview Abstract] |
Saturday, October 30, 2021 10:12AM - 10:24AM |
L02.00002: Position Reconstruction for DarkSide-20k David-Michael Poehlmann DarkSide-20k is a next-generation direct dark matter search experiment under construction at the Gran Sasso National Laboratory (LNGS) in Italy. The core of the detector is a two-phase liquid argon time projection chamber designed to probe WIMP interactions down to the neutrino floor. To ensure the 200 ton-year exposure has zero instrumental backgrounds, low-radioactivity underground argon is used as the detector medium. Backgrounds from detector surfaces are primarily rejected through fiducialization, which requires accurate reconstruction of event vertices. Monte Carlo simulations of interactions within the detector have been used to study the position reconstruction resolution of DarkSide-20k. In this talk, I discuss the performance of machine learning-based position reconstruction algorithms on simulated DarkSide-20k datasets. [Preview Abstract] |
Saturday, October 30, 2021 10:24AM - 10:36AM |
L02.00003: Magnetic Charge, the Dirac String and Photon Mass Douglas Singleton, Michael Dunia, Timothy Evan Dirac's model of magnetic charge requires a vector potential which is singular along a string that runs from the magnetic charge off to infinity. This string is argued to be unphysical since one can makes its effects apparently vanish by imposing the Dirac quantization condition on the product of electric and magnetic charge. In this talk we present recent work that shows the Dirac string may be more physical than originally thought both in the context of a massive photon and even in the limit when the photon mass is zero. [Preview Abstract] |
Saturday, October 30, 2021 10:36AM - 10:48AM |
L02.00004: Minimum Length Via Modified Operators Joey Contreras, Douglas Singleton, Michael Bishop, Jaeyong Lee Quantum Gravity theories sometimes predict the existence of minimal length. If this were to be the case one would suspect a type of photon dispersion where, due to interactions with the foam of spacetime, the photon would have energy-dependent velocities. However current observational data shows no such dispersion. We then propose an alternate theory that allows for minimal length via bound momentum operators and modified position operators that allows for minimal length and exhibits no such dispersion. Which results in a theory that isn't constrained by observational data in the same way that other models are. [Preview Abstract] |
Saturday, October 30, 2021 10:48AM - 11:00AM |
L02.00005: Yukawa Dirac String Potential Michael Dunia, Douglas Singleton, Timothy Evans We present a solution to the system of a magnetic charge plus photon mass which corrects previous work on this system. Contrary to previous claims this system has a very simple, closed form solution which is the Dirac string potential multiplied by an exponential decaying part i.e. a Yukawa Dirac string potential. We discuss some interesting features of this new, exacted solution. [Preview Abstract] |
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