Bulletin of the American Physical Society
Far West Section Fall 2022 Meeting
Volume 67, Number 10
Friday–Saturday, October 7–8, 2022; University of Hawaiʻi at Mānoa, Honolulu, HI
Session P03: High Energy, Accelerator, and Particle Physics |
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Chair: Douglas Singleton, California State University Fresno - Fresno, CA Room: University of Hawai'i at Manoa, East-West Center Pacific |
Saturday, October 8, 2022 10:30AM - 10:54AM |
P03.00001: Identified hadron spectra in high-statistics p+p collisions at 158 GeV/c. Anirvan Shukla The detection of cosmic-ray antinuclei is a potential breakthrough approach for the identification of dark matter. The dominant source of antinuclei in the astrophysical background are proton interactions with the interstellar molecular hydrogen gas. Typically, modelling the production of light antinuclei requires antiproton production cross sections as an input. Hence, antiproton production needs to be measured with high precision. The two most popular models to describe antinuclei production are the coalescence and thermal model, but they are based on different underlying physics. A better understanding of antinuclei production mechanisms is needed, which motivates the effort to analyze large data sets from fixed-target experiments. |
Saturday, October 8, 2022 10:54AM - 11:06AM |
P03.00002: HH and SH Studies at ATLAS in the bbττ state: what mass S is discoverable? Rebecca Robles With the discovery of the Higgs boson in July 2012 with a mass of 125 GeV, there was a common drive to pursue what this could mean -- not only for the Standard Model (SM), but for possible exploration beyond the Standard Model (BSM). While so far all the properties of the Higgs are consistent with SM predictions, it's the di-Higgs production that has demonstrated its vitality to deciphering the Higgs' potential. Whether for better understanding electroweak symmetry breaking mechanisms in particle physics, or for clarity on the formation and evolution of the Universe in astrophysics, di-Higgs production could be the key to answering those questions. Along with the search for HH, we are expanding the study to a new scalar boson S. Using Monte Carlo data from ATLAS, we plotted mass histograms for the non-resonant decays of X→SττHbb and X→SbbHττ. As the mass of the S boson gets closer to that of the Higgs boson, it's possible that a new particle or resonance would not be distinguishable. A study was done to see what mass the S boson could be discoverable. Further analysis is in progress to analyze the overlapped histograms through Gaussian or Brett-Wagner fits, which would help determine whether future simulations would need to be modified to accomodate this effect. |
Saturday, October 8, 2022 11:06AM - 11:18AM |
P03.00003: Minimum length in 3D without modified commutators Michael A Bishop, Douglas A Singleton, Joey Contreras, Peter Martin In this work we investigate the Generalized Uncertainty Principle (GUP) in three dimensions. Using various constraints based on experiment, observations, or theory we find specific forms of the modified three dimensional position and momentum operators, leading to a modified commutator and a modified uncertainty principle for these operators (i.e. a GUP). We find that the three dimensional GUP exhibits some interesting phenomena that do not occur in one dimension, e.g. the minimal distance scales in the direction parallel to a particles velocity can be different from the perpendicular direction. We also discuss the application of this three dimensional GUP to possible experiments/observations such as photon dispersion from gamma ray bursts and the GZK cutoff. |
Saturday, October 8, 2022 11:18AM - 11:30AM |
P03.00004: Investigation of interference effects in resonant and non-resonant Beyond the Standard Model Higgs Pair Production at ATLAS Thomas Adams, Kathryn T Grimm, Jason Veatch, Thomas Adams Searching for Higgs pair production, in events with two b-jets and two τ-leptons, the Standard Model predicts non-resonant HH production below the sensitivity of the currently available LHC data set. Significant non-resonant and resonant enhancements to the HH cross section are predicted in many Beyond-the-Standard-Model theories, including a Heavy Higgs boson decaying to two 125 GeV mass Higgs bosons. |
Saturday, October 8, 2022 11:30AM - 11:42AM |
P03.00005: Calibration strategies for the DarkSide-20k experiment Victor Goicoechea Casanueva, Jelena Maricic, Victor Goicoechea Casanueva The existence of dark matter is well documented by large amounts of evidence at both galactic and cosmological scales. Weakly interactive massive particles (WIMP) are an appealing candidate in the scientific community, and an interaction of such particle with baryonic matter can be detected using rare event searches experiments. The next generation detector DarkSide-20k aims to detect such interactions using dual phase time projection chambers (TPC) technology. A careful and accurate characterization of these detectors is required to achieve their physics goals. The main calibration strategy of the DarkSide-20k is presented. The strategy is composed of two main components: the calibration sources and the deployment system. The baseline for the deployment system is a motor box connected to a guide tube system that will ensure the calibration sources are deployed at different positions surrounding the TPC. The calibration sources and some of their direct uses are: radioactive sources for position reconstruction resolution and fidualizaiton of the active volume, neutron sources to distinguish between electronic and neutron band, and distributed gas light sources to measure the light yield and light spatial uniformities in the main active volume. |
Saturday, October 8, 2022 11:42AM - 11:54AM |
P03.00006: g-Mode Oscillations in Neutron Stars with Hyperons Vinh Tran, Prashanth Jaikumar The physics of microscopic interactions at intermediate densities such as in neutron star cores is currently not well constrained. As a result, the types of core matter ranges from purely nucleonic matter, to pure quark matter, to hybrid compositions with possible phase transitions. A potential tool for this composition problem is stellar oscillations and in particular the g-mode oscillation which depends on two sound speeds in matter and thus the composition of the material itself. In our work, we calculate g-mode oscillations in the context of relativistic mean field models for compositions including hyperons and we observe distinct qualitative differences between the oscillation spectra between nucleonic matter and hyperonic matter. The dramatic difference seems to indicate that should we detect g-mode oscillations in neutron stars through gravitational wave detection, we could constrain the type of matter in the core and allow us to determine if hyperonic matter can exist in neutron stars. |
Saturday, October 8, 2022 11:54AM - 12:06PM |
P03.00007: PROSPECT-I Measurement of Absolute Reactor Antineutrino Flux Andrew Meyer |
Saturday, October 8, 2022 12:06PM - 12:18PM |
P03.00008: A new method for calibration of the DUNE Liquid Argon Near Detector Ranjan Dharmapalan The Deep Underground Neutrino Experiment will begin an era of precision physics as it seeks to measure the CP violation in the lepton sector, search for astrophysical neutrinos and look for proton decay. The Near Detector will play a crucial role in reducing the systematic uncertainties related to the neutrino flux and meet the 1% energy resolution targeted by the experiment. |
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