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 M01: Nuclear/Particle Physics III |
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Chair: Michael Paolone, New Mexico State University Room: UNM PAIS 1100 |
Saturday, October 15, 2022 1:00PM - 1:12PM |
M01.00001: The Next Chapter for the Dynamical Diquark Model Steven Martinez Almost twenty years of direct study pointed towards the experimentally evidenced heavy-quark exotic hadrons has produced a multitude of appealing theoretical paradigms. Still, no single picture has emerged as the undeniable forerunner. In 2014, a paper published by Brodsky, Hwang, and Lebed introduced a picture that is now the foundation of the Dynamical Diquark Model. This model has since produced a number of exciting results, and continues to survive the seemingly endless onslaught of new experimental data being produced in this field. However, it was not until recently that an attempt was made to incorporate so-called 'threshold effects' into the model. It seems that it must be no coincidence that so many exotic states lie just below (or even just above) the energy threshold of di-hadron configurations. In this presentation, we will review the core components of the dynamical diquark picture and model, and describe how the incorporation of the diabatic formalism (an extension of the adiabatic approximation) may allow for these threshold effects to manifest. |
Saturday, October 15, 2022 1:12PM - 1:24PM |
M01.00002: Measurements of sensor radiation damage in the ATLAS pixel detector using leakage currents Mohamed Hijas Mohamed Farook, Sally Seidel, Radek Novotny Non-ionizing energy loss causes bulk damage to the silicon sensors of the ATLAS pixel detector. This damage has important implications for data-taking operations, charged-particle track reconstruction, detector simulations, and physics analysis. Simulations and measurements of the leakage current in the ATLAS pixel detector as a function of location in the detector and time, using data collected in Run 1 (2010-2012) and Run 2 (2015-2018) of the Large Hadron Collider are presented. Plans for improved analysis in Run 3 are also presented. |
Saturday, October 15, 2022 1:24PM - 1:36PM |
M01.00003: Bottom Quark Hadronization at LHCb Julie L Nelson, Matt Durham The process by which partons evolve into visible matter, known as hadronization, is poorly understood. In particular, the influence of the underlying events on the hadronization process requires further study. The LHCb detector is uniquely well suited to study the hadronization of heavy quarks. With full particle ID, precision vertexing, and a high rate DAQ, LHCb allows large samples of heavy quark decays to be recorded. This talk will present LHCb data on hadronization of heavy bottom quarks, and discuss the status of a new LHCb analysis of bottom baryon production versus charged particle multiplicity. |
Saturday, October 15, 2022 1:36PM - 1:48PM |
M01.00004: Stability analysis of non-Abelian electric fields Jude Pereira, Tanmay Vachaspati We study the stability of fluctuations around a homogeneous non-Abelian electric field background that is of a form that is protected from Schwinger pair production. Our analysis identifies the unstable modes and we find a limiting set of parameters for which there are no instabilities. We discuss the potential implications of our analysis for confining strings in non-Abelian gauge theories. |
Saturday, October 15, 2022 1:48PM - 2:00PM |
M01.00005: Reassessing the Possibility of Dark Matter Discovery in the DAMA Signal Masen D Pitts The DAMA/LIBRA Collaboration has, for the last 20 years, reported an annual modulation in possible dark matter interactions with ordinary matter that is consistent with the predicted existence of a dark matter halo surrounding the Milky Way Galaxy. However, despite these exciting results several similar detection experiments have been performed since DAMA/LIBRA first reported their results, with none of them upholding the claim of discovery. The goal of our research is to use numerical tools to provide more insight into the results of these experiments and narrow the list of possible explanations for the supposed discovery. We have used The Global And Modular BSM Inference Tool (GAMBIT) to more carefully describe the allowed properties of dark matter interactions that fit the data in these experiments and have created additional tools to help visualize these results. We have also implemented more recent data published on the quenching factors of sodium and iodine into our analyses and have re-affirmed the incompatibility of the results of the ANAIS-112 and COSINE-100 experiments with DAMA/LIBRA. We have further shown that a spin-independent interaction model for dark matter no longer fits the DAMA/LIBRA data, and that spin-dependent models alone provide acceptable fits. |
Saturday, October 15, 2022 2:00PM - 2:12PM |
M01.00006: Analysis of the rare decays B0→μ+μ- and Bs0→μ+μ- at ATLAS Josef D Sorenson, Sally Seidel, Alessandro Cerri The rare decays B0→μ+μ- and Bs0→μ+μ- have measurable deviations of their rates from the Standard Model (SM) predictions in many Beyond the Standard Model (BSM) extensions, such as the Minimal Supersymmetric, Minimal Flavor Violation, and Two Higgs-Doublet models. The SM predictions for these decays are in tension with the most recent combined LHC results. The branching ratio measurement uses the reference channel B+→J/Ψ[→μ+μ-]K+. I will discuss data analysis methods for extraction of the reference channel yield, including Monte Carlo modeling, simultaneous functional fits, and systematic error extraction for the partial Run 2 analysis and for analysis which is in development for the Full Run 2 data. |
Saturday, October 15, 2022 2:12PM - 2:24PM |
M01.00007: Searching for the Migdal Effect Elizabeth Tilly, Dinesh Loomba The Migdal effect is a rare atomic process in which a sudden kick to the atomic nucleus can, with a small probability, lead to the emission of an electron or other forms of radiation. Several large-scale dark matter (DM) experiments have recently invoked this effect to rule out low-mass parameter space, but it has never been experimentally observed under the conditions applicable for DM searches, i.e., in nuclear recoils from electrically neutral projectiles. Thus, a current effort by the MIGDAL collaboration is underway to directly observe and characterize this effect in gases of interest for DM. This will be accomplished using a low-pressure optical time projection chamber equipped with a fast CMOS ORCA-Fusion camera recording high-resolution track images generated by a stack of two glass Gas Electron Multipliers (GEMs) and an Indium Tin Oxide (ITO) anode plane segmented into 120 readout strips enabling full 3D reconstruction of Migdal event topologies. In this talk, I will describe the MIGDAL experiment, some of its challenges, and the methods we are developing to mitigate these for an accurate measurement. |
Saturday, October 15, 2022 2:24PM - 2:36PM |
M01.00008: Electroweak dumbbell configurations and their dynamics Teerthal Patel, Tanmay Vachaspati We numerically study the static configurations and subsequent evolution of monopole-antimonopole pairs joined by a Z-string or "dumbbells" that arise in the electroweak theory. We have constructed the static configurations of the dumbbells for a range of separations and twists, a novel parameter that has vital implications on the energy and subsequent dynamics of the configuration. The unstable static solutions are obtained by numerical relaxation and will serve as initial condition. The numerical scheme has been used to study the zero separation case which agrees with previous results obtained for the electroweak sphaleron by Manton. Outline of ongoing work to study their evolution for a range of initial separations and angular momentum will be presented. The primary aim is to study generated signals and the lifetime of these configurations, as the initially twisted dumbbells untwist while rotating and eventually undergo mutual annihilation. This study could have interesting implications in high energy experiments searches for monopoles and cosmology, especially cosmic magnetic fields generated in the early Universe. |
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