Bulletin of the American Physical Society
2020 Fall Meeting of the APS Prairie Section
Volume 65, Number 22
Friday–Sunday, November 13–15, 2020; Virtual
Session A06: Parallel A |
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Chair: Yagmur Torun, Illinois Institute of Technology |
Friday, November 13, 2020 1:15PM - 1:30PM |
A06.00001: Probing the top Yukawa coupling at the LHC via associated production of single top and Higgs Ya-Juan Zheng We study Higgs boson production associated with single top or anti-top via $t$-channel weak boson exchange at the LHC. The process is an ideal probe of the top quark Yukawa coupling, because we can measure the relative phase of $htt$ and $hWW$ couplings, thanks to the significant interference between the two amplitudes. By choosing the emitted $W$ momentum along the polar axis in the $th (\bar{t}h)$ rest frame, we obtain the helicity amplitudes for all the contributing subprocesses analytically, with possible CP phase of the Yukawa coupling. We study the azimuthal asymmetry between the $W$ emission and the $W b (\bar{b}) \to t(\bar{t}) h$ scattering planes, as well as several $t$ and $t$ polarization asymmetries as a signal of CP violating phase in the $htt$ coupling. Both the azimuthal asymmetry and the polarization perpendicular to the scattering plane are found to have the opposite sign between the top and anti-top events. We identify the origin of the sign of asymmetries, and propose the possibility of direct CP violation test in pp collisions by comparing the top and anti-top polarization at the LHC. [Preview Abstract] |
Friday, November 13, 2020 1:30PM - 1:45PM |
A06.00002: The CMS Outer Tracker Upgrade for the HL-LHC Maxwell Herrmann The LHC is planning an upgrade program which will smoothly bring the luminosity up to $5\times10^{34}\text{cm}^{-2}\text{s}^{-1}$, to possibly reach an integrated luminosity of $3000\ \text{fb}^{-1}$ at the end of the next decade. This scenario, called the High Luminosity LHC (HL-LHC), will require an upgrade to the LHC detectors known as Phase-2 upgrade. The current CMS Outer Tracker will be replaced by a completely new device, in order to fully exploit the highly demanding operating conditions and the delivered luminosity. The new Tracker will also have trigger capabilities. To achieve these goals, R&D activities are ongoing to develop solutions that would make this possible. In this presentation, some design choices for the CMS Outer Tracker upgrade are discussed along with some highlights of the assembly and testing developments. [Preview Abstract] |
Friday, November 13, 2020 1:45PM - 2:00PM |
A06.00003: Overview of the MAJORANA DEMONSTRATOR Experiment Tupendra Oli Neutrinoless double beta decay ($0 \nu \beta \beta$) is a hypothesized nuclear transition which, if observed, would unambiguously demonstrate the violation of an observed symmetry of the Standard Model (SM) and establish the Majorana nature of neutrinos. The MAJORANA DEMONSTRATOR is a Ge-based $0 \nu \beta \beta$ experiment currently operating at the 4850$^{'}$ level of the Sanford Underground Research Facility in Lead, SD. The DEMONSTRATOR operates 44 kg of p-type point contact Ge detectors (30 kg enriched in Ge-76) in two modules that are surrounded by low background passive shield. The experiment has achieved the best energy resolution of any current generation experiment which is at 2.5 keV FWHM at the 2039 keV Q-value for $0 \nu \beta \beta$. In addition to $0 \nu \beta \beta$ search, the excellent energy resolution and ultra-low background allow the DEMONSTRATOR to search for new physics beyond the Standard Model in the low energy region. The completed hardware upgrade has improved cable and connector reliability and sets the final run configuration of the DEMONSTRATOR. In this talk, we will review the DEMONSTRATORS’s latest results, recent upgrades, and ongoing data-taking and analysis improvement efforts. The status and near-term plans of the experiment will be discussed. [Preview Abstract] |
Friday, November 13, 2020 2:00PM - 2:15PM |
A06.00004: PROSPECT-II Detector Upgrade and Sterile Neutrino Oscillation Sensitivity Manoa Andriamirado The Precision Reactor Oscillation and SPECTrum, or PROSPECT, detector is designed to search for eV-scale sterile neutrino oscillation. It consists of segmented $^6$Li-doped liquid scintillator deployed at $\sim$7m from the High Flux Isotope Reactor at Oak Ridge National Laboratory. As a result of the short baseline deployment, the PROSPECT detector is excellent to probe mass-squared splitting between 0.1-10 eV$^2$. While new limit on sterile neutrino has been reached with PROSPECT recent results, progress remains to be made. An improved version of PROSPECT detector is in progress that will exceed the current limit in the oscillation phase space. This talk will discuss PROSPECT-II detector and its projected sensitivity for future deployments. [Preview Abstract] |
Friday, November 13, 2020 2:15PM - 2:30PM |
A06.00005: Study of the Form Factors of the Decay B→Dlν in the Lattice Regime Daniel Simons I studied the decay rate of the particle decay $B \rightarrow D l \nu_l$ using data collected from the Belle Collaboration. In order to analyze this decay rate, I used two different form factor parametrizations, CLN (Caprini, Lellouch, and Neubert) and BGL (Boyd, Grinstein, and Lebed). I was able to fit these form factors to the data collected by the Belle collaboration to determine the free parameters $\mathcal{G}(1)$ and $\rho^2$. And the goal of my project was to fit these form factors in only lattice regime, taking only the data points where the recoil variable $w <$ $\sim 1.3$, which corresponds to the lower energy portion of the full data set. The purpose of this is to determine how many data points I need to get a good fit for the free parameters, but few enough data points that I am still in the low energy regime. [Preview Abstract] |
Friday, November 13, 2020 2:30PM - 2:45PM |
A06.00006: Using Euclidean Lattice Field Theory for Efficient Quantum Simulation of a $Z_2$ Gauge Theory Erik Gustafson, Henry Lamm Preparing strongly-coupled states on quantum computers requires large resources. In this work, we show how classical sampling coupled with projection operators can be used to compute Minkowski matrix elements without explicitly preparing these states on the quantum computer. We demonstrate this for the 2+1d $\mathbb{Z}_2$ lattice gauge theory. We show that this algorithm is competitive with adiabatic state preparation. [Preview Abstract] |
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