Bulletin of the American Physical Society
Joint Fall 2021 Meeting of the Texas Sections of APS, AAPT, and SPS
Volume 66, Number 10
Thursday–Saturday, October 21–23, 2021; Houston; Central Time
Session J05: Nuclear & Particle I |
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Chair: Samina Masood, UHCL Room: STEM 2101 |
Friday, October 22, 2021 10:00AM - 10:24AM |
J05.00001: Non-Equilibrium Phases of Matter in Cavity QED Invited Speaker: Michael Kolodrubetz Time-periodic (Floquet) drive has become a powerful tool to engineer new phases of matter, both in equilibrium and far from equilibrium. In this talk, I show how ideas from Floquet lead to unexpected phases of coupled light and matter when the drive photons are treated as quantized degrees of freedom, a regime known as cavity quantum electrodynamics (QED). Ideas common across condensed matter physics, from symmetry breaking to topology, all appear in a new light upon using this cavity QED mapping. Finally, I discuss possible experiments in both cavity QED systems that use ultracold atoms and cavity QED-like setups that use superconducting circuits as artificial atoms. [Preview Abstract] |
Friday, October 22, 2021 10:24AM - 10:36AM |
J05.00002: Abstract Withdrawn
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Friday, October 22, 2021 10:36AM - 10:48AM |
J05.00003: Development of a CMS GEM Alignment Algorithm with Muons in pp Collisions in Run 2 Slice Test Towsifa Akhter, Hyunyong Kim, Devin Aebi The CMS muon system plays an important role in the discovery of new physics like the Higgs boson and new particles. The next phase of the LHC is planned to increase luminosity to improve the discovery power. The high luminosity LHC (HL-LHC) will be a harsh environment of pp collisions and will require high-performance muon trigger and muon track reconstruction, especially in the endcap region. In order to maintain the performance of the CMS muon system, the CMS collaboration has been developing a Gas Electron Multiplier (GEM) detector for the endcap regions of the CMS muon system. The new sub-detector system requires a new procedure of commissioning and alignment to be developed. We report the status of the GE1/1 alignment in Run 2 slice test. [Preview Abstract] |
Friday, October 22, 2021 10:48AM - 11:00AM |
J05.00004: Fluctuations in Lambda Multiplicity Distribution in Au+Au Collisions at $\sqrt{s_{NN}}=3$ GeV at STAR Jonathan Gonzalo Ball Cap The study of nuclear matter over a wide energy range is provided by the RHIC Beam Energy Scan (BES), the program focuses on locating the critical end point (CEP) in the QCD phase diagram. For the first BES, the kurtosis$\times$variance in net-proton multiplicity distribution as a function of $\sqrt{s_{NN}}$ exhibited a non-monotonic variation with 3.1$\sigma$ significance, which is expected to be a signature of the CEP. This result motivated the increase in statistics and extending the collision energy down to $\sqrt{s_{NN}}=3.0$ GeV. The study of fluctuations in net-lambda multiplicity distribution allows to use its baryonic and strangeness contribution to study freeze-out parameters in the context of quark-mass dependence, which can also be used to compare with the results from net-proton fluctuations and net-kaon fluctuations. We present the event-by-event fluctuation analysis of the net-lambda multiplicity distribution for the fixed target physics run at $\sqrt{s_{NN}}=3.0$ GeV which will be compared with the results of the previous net-lambda fluctuation studies for BES and net-proton fluctuations at the same energy. [Preview Abstract] |
Friday, October 22, 2021 11:00AM - 11:12AM |
J05.00005: Annihilation processes for a new dark matter WIMP Brandon Torres, Caden LaFontaine, Bailey Tallman, Spencer Ellis, Sabrina Hernandez, Diego Cristancho Guerrero, Trevor Croteau, Roland Allen We propose a new dark matter WIMP which results from an extended Higgs sector, and which has only second-order gauge couplings. The coupling to the Higgs is constrained to be small by direct-detection experiments, and potential couplings to supersymmetric partners are also second-order. For this reason the annihilation cross-section is relatively small. Nevertheless, there would be inconsistency with both the observed relic abundance of the dark matter and the Fermi-LAT measurements of gamma-ray emissions from dwarf spheroidal galaxies if the mass of our proposed particle were larger than that of the W boson. We will discuss the annihilation processes for this particle, and contrast them with those for the neutralino of supersymmetry and the bosonic dark matter candidate of the ad hoc ``inert doublet model''. Our estimates of the past were based on simple approximations, and we are now undertaking more detailed calculations of cross-sections with software packages such as MadDM. [Preview Abstract] |
Friday, October 22, 2021 11:12AM - 11:24AM |
J05.00006: Detecting the Elusive Neutrinos Around Us Ahmed Bedair, Jaehoon Yu, Cristobal Garces, Aayush Bhattarai, Steven Boucher, Eric Garcias, Gajendra Gurung, Harshwardhan Prasad Neutrinos are subatomic particles which were originally thought to be massless. However, it has been disproven and shown to hold a small nonzero mass. The Deep Underground Neutrino Experiment (DUNE) is an international collaboration further investigating these properties of neutrinos and proton decay. The far detectors will consist of a mixture of single-phase horizontal drift (SPHD) and single-phase vertical drift (SPVD) technology, implying the direction of charged particles moving within the detector chamber. ProtoDUNE-SPHD is a prototype detector exploring and validating the single-phase liquid Argon horizontal drift technology behind DUNE. Its detector consists of the Time Projection Chamber (TPC), Cold Electronics (CE) and a Photon Detection System (PDS). The overall goal for this prototype single-phase detection system is that it will serve to validate the cryostat technology behind the SP technology for DUNE, help with calibration for future readings and increase optimization for DUNE through simulations. [Preview Abstract] |
Friday, October 22, 2021 11:24AM - 11:36AM |
J05.00007: Search for Light Mass Dark Matter using Leptophilic Gauge Bosons Model in Neutrino Experiments Like DUNE and MiniBooNE Gajendra Gurung, Francesco Capozzi, Bhaskar Dutta, Wooyoung Jang, Ian Shoemaker, Adrian Thompson, Jaehoon Yu The search for Dark Matter is a well-motivated effort in high energy physics and cosmology. One of the promising anomaly-free models which fit the description of Light-Mass Dark Matter is an extension of the Standard Model featuring a light gauge boson $Z'$. This boson, $Z'$ weakly couples with the leptons by gauging $L_\mu - L_e$, $L_e - L_\tau$ and $L_\mu-L_\tau$. Such a Low-Mass $Z'$ is also able to explain the measured value of the muon’s anomalous magnetic moment. We look at the production of $Z'$ through meson decay, proton bremsstrahlung, and resonant on shell production. In this model, $Z'$ undergoes mixing with photons and further decays into $e^\pm$ and $\mu^\pm$. Therefore, we use the existing beam dump data from MiniBooNE and simulation study of DUNE to probe the understanding of Dark Matter, through achieving competitive constraints on the gauge coupling parameter $g_{Z'}$ of $Z'$. [Preview Abstract] |
Friday, October 22, 2021 11:36AM - 11:48AM |
J05.00008: The Identification of Contaminants by Time Evolution in 99Mo Gamma-Decay Spectrum Nolan Tenpas, Marcia Rodrigues, Aldo Bonasera In efforts to differentiate emitted $\gamma $-rays with similar emission energies in the analysis of $\gamma $-decay spectra from the 99Mo production, an automated program was created. The 99Mo production is part of the novel approach to producing medical isotopes, using inverse kinematics, successfully implemented at the Cyclotron Institute, Texas A{\&}M University. The 99Mo was produced using an accelerated 100Mo beam impinging on a 4He gas cell-target. An 27Al catcher foil was used to collect the 99Mo nuclei, as well as other coproduced nuclides. After irradiation, the $\gamma $ decays spectra of the foil was measured using HPGe detectors. The photopeak associated with the highest $\gamma $-ray intensity of 99Mo, located at E$\gamma =$140.5 keV, was not resolved, due to contributions of $\gamma $ decays from multiple nuclides. The total activity at E$\gamma =$140.5 keV can be described as a combination of 99Mo (t1/2$=$65.94 h; I$\gamma =$89.43{\%}), 99mTc (t1/2$=$6.01 h; I$\gamma =$89.0{\%}), and 90Nb (t1/2$=$14.60 h; I$\gamma =$66.8{\%}). The new analysis program was used to plot the activities as a function of time, for the 140.5 keV photopeak while considering the activities obtained from other photopeaks associated with 99Mo (E$\gamma =$181 keV) and 90Nb (E$\gamma =$1129 keV). Using the known decay constants of each produced nuclide, the contribution of each nuclide was determined. The activity as a function of time was fitted and contributions from 99mTc, 99Mo, and 90Nb were determined. [Preview Abstract] |
Friday, October 22, 2021 11:48AM - 12:00PM |
J05.00009: Charmed hadron analysis in small relativistic heavy ion systems at the LHC Oveis Sheibani Charmed hadrons, $\Lambda_{c}^{+}$and $D_{0}$, were measured in $\mathrm{pPb}$ collision at $\sqrt{s}=5.02 \mathrm{TeV}$ with the ALICE experiment. The following hadronic decay channels of $\Lambda_{c}^{+} \rightarrow K^{-} \pi^{+} p$ and $D_{0} \rightarrow$ $K^{-} \pi^{+}$were reconstructed. The purpose of this study was to measure the system size dependence of the charmed particle production by linking $\mathrm{pPb}$ measurements to $\mathrm{pp}$ and $\mathrm{PbPb}$ results. 600 million events were selected based on the number of tracklets in the inner detector, which serves as a charged particle multiplicity proxy, and thus as the estimator for the size of the system. The ratio of $\Lambda_{c}^{+}$to $D_{0}$ as a function transverse momentum is analyzed as a function of the charged particle multiplicity to see if higher multiplicity events exhibit enhanced baryon production, which could potentially be caused by the formation of small, thermally equilibrated QGP droplets. [Preview Abstract] |
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