Bulletin of the American Physical Society
2020 Annual Meeting of the APS Four Corners Section (Virtual)
Volume 65, Number 16
Friday–Saturday, October 23–24, 2020; Albuquerque, NM (Virtual)
Session E04: DM/HEP ILive
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Chair: Keith Ulmer, CU |
Friday, October 23, 2020 2:00PM - 2:24PM Live |
E04.00001: Searching for Supersymmetry at the Large Hadron Collider Invited Speaker: Keith Ulmer The Large Hadron Collider (LHC) at CERN currently provides the highest energy particle collisions ever produced in a laboratory. This talk presents searches for physics beyond the standard model in these high energy proton-proton collisions at the CMS experiment. In particular, we will discuss the current state and future prospects for the discovery of supersymmetry, a proposed symmetry of nature between fermions and bosons which may explain the particle nature of dark matter and allow for the unification of the strong, weak, and electromagnetic forces. [Preview Abstract] |
Friday, October 23, 2020 2:24PM - 2:36PM Live |
E04.00002: Numerical renormalization of infrared divergence for pair production in QED Ethan Gibson, Scott Glasgow, Devin McGhie, Jared Coleman We seek to resolve non-perturbative solutions to systems of pair-production in quantum electrodynamics (QED). We constrain our system to one spatial dimension, and examine the dressed vacuum state, compared with a system in which a photon decays into an electron-positron pair. We find that both systems encounter an Infrared (IR) divergence in their Hamiltonian. We describe photon momentum states using relativistic energy, assuming photon mass $m_{\gamma } $. By allowing photon mass to approach zero, we allow for regularization of the system. Using this regularization of photon mass, we obtain a numerical renormalization for pair production that we can use for further systems in pure QED. [Preview Abstract] |
Friday, October 23, 2020 2:36PM - 2:48PM Live |
E04.00003: Quantification of the Two-Dimensional Range-Component Signature for the DRIFT-IIe Detector Frederick Schuckman Evidence suggests that a halo of dark matter surrounds and is distributed throughout our galaxy. The Weakly Interacting Massive Particle (WIMP) has been a popular dark matter candidate. As we move through this halo it should appear as a wind of WIMPs incident upon us. A properly-placed detector could have this wind blow through its top face at one time in the day, and through a side face 12 sidereal hours later. DRIFT-IIe is a low-pressure gas negative-ion time projection chamber designed for direct and directional detection. Partial directional information of a WIMP recoil could be extracted by measuring the range of the track of ionization that it produces in two dimensions. To study this signature, the detector was exposed to a source of neutrons in a series of runs. In one run the source was placed above the detector and in a second run the source was placed to the side of the detector. Neutron recoils mimic those expected from WIMPs, and the source placement mimics a specific WIMP wind direction. For the two runs, the range information was compared with a Monte Carlo resampling test. It was found on average 302 $\pm$ 4 neutron recoils, sampled with WIMP-like energy spectra, are required along each of these axes to discern the two populations with a significance of 3$\sigma$. [Preview Abstract] |
Friday, October 23, 2020 2:48PM - 3:00PM Live |
E04.00004: Resolving Divergences for Electron-electron Scattering in QED Jared Coleman, Scott Glasgow, Devin McGhie We begin with the Quantum Electrodynamic Hamiltonian, with specific emphasis on the Coulomb term. Given a system containing two electrons, we proceed to solve the Schrodinger equation using non-perturbative methods. For greater ease in computation, we constrain the system to one dimension. Additionally, since the Coulomb term contains an integral over an inverse square, we introduce a mollifier to produce numerically computable solutions. Lastly, we investigate the behavior of the eigen-energies and the dynamics of the system in the limit in which our mollifier approaches zero. [Preview Abstract] |
Friday, October 23, 2020 3:00PM - 3:12PM |
E04.00005: Searching for Sterile Neutrinos and Accelerator Produced Dark Matter with the Coherent CAPTAIN-Mills (CCM) Detector at the Los Alamos Neutron Science Center T.J. Schaub, Richard Van de Water, Sandra Biedron, CCM Collaboration The MiniBooNE and LSND experiments have shown compelling evidence for sterile neutrinos in short baseline neutrino oscillation experiments. In these experiments, an excess of electron neutrino appearance was observed from a pure muon neutrino beam, and if these data are interpreted as sterile neutrino oscillations, the mass scale is \textasciitilde 1 eV$^2$. Coherent CAPTAIN-Mills (CCM) is a new experiment to search for muon neutrino disappearance at the LSND energy scale. CCM will use a 10-ton liquid argon scintillation detector to leverage the enhanced cross section from coherent elastic neutrino-nucleus scattering. CCM will operate at the Lujan Center at LANSCE which is a 100-kW stopped pion source that delivers an 800-MeV proton beam onto a tungsten target at 20 Hz with a pulse width of 275 ns. This fast pulsing is crucial for isolating the monoenergetic muon neutrino in time and reducing neutron backgrounds. In this talk, I will describe sterile neutrino theories, the CCM detector and sensitivities, and show preliminary results from our successful 2019 beam run. [Preview Abstract] |
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