Bulletin of the American Physical Society
Four Corners Section 2022 Meeting
Volume 67, Number 14
Friday–Saturday, October 14–15, 2022; Albuquerque, New Mexico
Session J01: Nuclear/Particle Physics II |
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Chair: Douglas Fields, UNM Room: UNM PAIS 1100 |
Saturday, October 15, 2022 8:30AM - 8:42AM |
J01.00001: First Laboratory Bounds on Ultralight Dark Photon Dark Matter from Precision Atomic Spectroscopy Amit Bhoonah, Joshua Berger Ultralight bosonic dark matter has come under increasing scrutiny as a dark matter candidate that has the potential to resolve puzzles in astronomical observation. We demonstrate that high-precision measurements of time variation in the frequency ratios of atomic transitions achieves leading sensitivity to ultralight vector portal dark matter at low masses. These bounds are the first laboratory-based bounds on this class of dark matter models. We propose further measurements that could enhance sensitivity to ultralight dark photons. |
Saturday, October 15, 2022 8:42AM - 8:54AM |
J01.00002: Global Constraints on CP Violation in the Higgs Sector Jonathan M Cornell, Joachim Brod, Dimitrios Skodras, Emmanuel Stamou Charge-Parity (CP) symmetry violating contributions to Higgs--fermion couplings are absent in the standard model of particle physics, but are motivated by models of electroweak baryogenesis. In this talk, I will present results of a study of the constraints on these couplings from a combination of Large Hadron Collider data and experimental bounds on the electron, neutron, and mercury electric dipole moments (EDMs). While previous studies have focused on scenarios with CP-violation in the interaction of the Higgs with a single fermion species, using the GAMBIT software framework we have undertaken global fits that allow for the presence of CP-violating contributions from several fermion species, as could be expected in more realistic UV complete scenarios. I will show that allowing for these multiple CP-violating interactions can substantially relax previously presented constraints from EDMs. |
Saturday, October 15, 2022 8:54AM - 9:06AM |
J01.00003: Analysis of a Traditional Field-Shaping Structure for the ND-LAr Detector Eleanor A Schnee The Deep Underground Neutrino Experiment (DUNE) Liquid Argon Near Detector (ND-LAr) will be composed of 35 time projection chamber (TPC) modules for its measurements. The electric field that will drift ionization electrons in these TPC modules is created by a field-shaping structure. Studies of a traditional field-shaping structure design that steps down the high voltage by employing resistors across many copper strips will be presented in this talk. The use of a discrete pattern of strips leads to non-uniformities in the electric field that can distort the paths of drifting electrons. We sought to compare the field non-uniformities between multiple strip geometries in order to understand what minimized them, and how they affected the drift path of electrons. Our results concluded that the most uniform electric field and least drift distortions were produced by strip geometries with smaller strip widths and strip spacings. These findings should be considered in the design of a traditional field-shaping structure for the ND-LAr detector. |
Saturday, October 15, 2022 9:06AM - 9:18AM |
J01.00004: Beyond the Standard Model Searches with Coherent CAPTAIN Mills Edward Dunton Searches for beyond the standard model (BSM) physics have been ongoing for decades. The use of accelerators to produce boosted low mass particles offers a path to detect potential BSM particles at mass scales below 1 GeV. The Coherent CAPTAIN Mills (CCM) experiment uses a 10-ton liquid argon scintillation detector at the Lujan Center at LANSCE to search for physics beyond the standard model. Such physics includes vector portal light dark matter (LDM), axions, and axion like particles (ALPs). The Lujan Center delivers a 100-kW, 800 MeV, 290 ns wide proton pulse onto a tungsten target at 20 Hz to generate a stopped pion source. The fast pulse, in combination with the speed of the CCM scintillation detector, is crucial for isolating prompt speed of light particles generated by the stopped pion source and reducing neutron and steady state background. In this talk I will describe CCM's search for BSM physics by showing the results from our Fall 2019 search for LDM and ALPs, as well as the projected reach of the experiment based on the current upgrades to the CCM detector for a 3-year run. |
Saturday, October 15, 2022 9:18AM - 9:30AM |
J01.00005: Developments in Purity Monitoring at CSU Samuel J Fogarty Purity monitors (PrMs) measure liquid argon (LAr) purity in Liquid Argon Time-Projection Chambers (LArTPCs). LArTPCs drift ionization electrons from charged particle tracks toward an anode to form a 2D image. Full 3D track reconstruction is made using the drift time coordinate determined by prompt scintillation light. LAr impurities (e.g., oxygen, water) reduce signal-to-noise ratios by attenuating electrons and scintillation light before detection. PrMs can monitor purity during a LAr fill, when a detector is not fully operational, or when cosmic rays for calibration are sparse (deep underground). A PrM drifts electrons from a cathode to an anode in LAr. Our PrM uses a xenon flash lamp and optical fibers to transmit UV light to a photo-cathode. Electrons ejected from a photo-cathode (via the photo-electric effect) drift in an electric field to the anode. Charge amplifiers integrate currents from the cathode and anode, producing a voltage nominally proportional to the input charge. The charge difference due to attachment by impurities is used to calculate the electron lifetime. This talk will describe our PrM system, including the PrM built at CSU, the electronics, methods to increase signal size, and tests in argon. |
Saturday, October 15, 2022 9:30AM - 9:42AM |
J01.00006: Monte Carlo Studies of B Meson Decays to Charged Leptons Plus a K-short meson in the ATLAS Detector at the LHC Andrew D Gentry, Sally C Seidel, Peter E Onyisi The ratio of the rate of decay of B mesons to K-short mesons plus two oppositely charged muons relative to the same rate with oppositely charged electrons is referred to as R(Ks0). A measurement of this ratio probes lepton universality and thus may provide a window onto new physics. Studies of Monte Carlo simulations of these types of events produced in the ATLAS detector at center of mass energy 13 TeV are presented. |
Saturday, October 15, 2022 9:42AM - 9:54AM |
J01.00007: A “suitcase” for antimatter: Constructing a transportable antiproton Penning trap Ameya Kunder, Daniel Popper, Fatma Abbass, Matthew A Bohman, Matthias Borchert, Jack Devlin, Stefan Erlewein, Steffen Gavranovic, Barbara Latacz, F. Rohland, Markus Wiesinger, Christian Will, Elise Wursten, Klaus Blaum, Yasuhiro Matsuda, Andreas Mooser, Christian Ospelkaus, Wolfgang Quint, Jochen Walz, Yasunori Yamazaki, Stefan Ulmer, Christian Smorra One of the fundamental unanswered questions in modern physics is why the universe contains dominantly matter over antimatter. Our group, as a part of the BASE collaboration, wants to search for a possible CPT violation by comparing the magnetic moment of both, protons and antiprotons. We would like to perform these measurements on the low energy antiprotons produced in the Antiproton-Decelerator (AD) at CERN. However, the fluctuations in the magnetic field inside the AD-hall pose a hurdle to attain higher levels of precision measurements. To overcome these limitations, we are currently developing the transportable antiproton Penning trap – STEP (Symmetry Tests in Experiments with Portable Antiprotons) – which can store the antiprotons delivered by the AD/ELENA facility, which can then be transported to a magnetically stable environment where enhanced precision tests can be performed with the antiprotons. We are developing two different trap setups to transport these ions: one using a transportable superconducting magnet and the other using permanent magnets. My talk will emphasize the principle, design and construction of the permanent magnet setup. |
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