Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session U11: Underground and Collider |
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Sponsoring Units: DPF Chair: Kate Scholberg, Duke University Room: Roosevelt 3 |
Monday, January 30, 2017 3:30PM - 3:42PM |
U11.00001: Proton Decay Searches with DUNE Kevin Wood The Deep Underground Neutrino Experiment (DUNE) will be comprised of a beam line and near detector complex at Fermilab, Illinois as well as a massive far detector located 1300 km away at Sanford Underground Research Facility (SURF), South Dakota. To achieve its rich physics program, DUNE plans to construct a 40kt fiducial volume Liquid Argon Time Projection Chamber (LArTPC) far detector almost a mile underground. The size, location, and technology of the proposed far detector make it an attractive tool to search for proton decay, which has yet to be observed. Observation of such a rare event requires high sensitivity to the signal and high background rejection rate. A particular background of interest arises from cosmic muons interacting with rock surrounding the detector and producing a variety of particles which can enter the detector and leave signatures similar to that of proton decay. In order to keep this background to a reasonable level without sacrificing signal acceptance efficiency, precise tracking, made possible by the LArTPC technology, is required. Precise 3D localization of proton decay events relies on the detector's ability to identify the prompt emission of scintillation light from proton decay events as the t0-defining signal. Therefore, low background rate and high detection efficiency of this light are the crucial to the search. This work examines these characteristics in a detailed Monte Carlo simulation using DUNE`s far detector reference design and demonstrates a high signal efficiency while keeping the expected number of cosmogenic background events sufficiently low. [Preview Abstract] |
Monday, January 30, 2017 3:42PM - 3:54PM |
U11.00002: Excited baryons and insensitivity to chiral symmetry breaking: variational Cornell-model computations Felipe J. Llanes-Estrada, Pedro Bicudo, Marco Cardoso, Tim Van Cauteren We address Insensitivity to chiral symmetry breaking (sometimes also known as chiral symmetry restoration) in the highly excited light-quark baryon spectrum, a goal of experiments such as JLab and CBELSA/TAPS. As the only existing option to have all of confinement, highly excited states, and chiral symmetry, we adopt the Coulomb-gauge formalism of QCD, truncated to a linearly confining Cornell model. With a systematic and numerically intensive variational treatment up to 12 harmonic oscillator shells we access several angular (up to spin J=13/2) and radial excitations both for I=1/2 and I=3/2 baryons, and study in detail previously proposed chiral multiplets. While static-light and light-light meson spectra have clearly been shown to become less sensitive to chiral symmetry breaking than the ground states, the realization of chiral symmetry that we find in the baryon spectrum is more complicated than earlier expected. [Preview Abstract] |
Monday, January 30, 2017 3:54PM - 4:06PM |
U11.00003: Amplitude analysis of the charmed decay D0 to KKpipi Nicola Skidmore An amplitude analysis of the 4-body charmed decay $D^0\rightarrow KK\pi\pi$ is presented using data collected from electron-positron collisions at the CLEO experiment. Both flavour tagged and CP tagged data are utilized in the analysis making it unique from amplitude analyses performed at other colliders and providing extra sensitivity to the phases of the amplitude components. The amplitude model is used to search for CP violation in the $D^0$ decay by analysing $D^0$ and $\bar{D^0}$ decays separately. The model is also crucial input for a model-dependent measurement of the CP-violating phase $\gamma$ using $B^{\pm}\rightarrow D^0(\rightarrow KK\pi\pi)K^{\pm}$ decays, which remains one of the least constrained parameters of the Standard Model. [Preview Abstract] |
Monday, January 30, 2017 4:06PM - 4:18PM |
U11.00004: ABSTRACT WITHDRAWN |
Monday, January 30, 2017 4:18PM - 4:30PM |
U11.00005: Mass Gap Equation in 1+1 Dimensional QCD Interpolating between the Instant and Front Forms of Relativistic Dynamics Bailing Ma, Chueng-Ryong Ji Due to the simplicity and the inherent characteristics of confinement, the 1+1 dimensional QCD known as 't Hooft model has attracted a lot of interest for many yers. In the large $N_c$ limit, the contribution from non-planar diagrams are negligible, hence an iterative equation can be simplified and solved numerically for the quark propagator dressed by gluons. While 't Hooft model was originally solved using the Light Front Dynamics (LFD), people have also done similar work afterwards in the Instant Form Dynamics (IFD). We attempt to interpolate the 1+1 dimensional QCD between IFD and LFD by introducing an angle called the interpolation angle. Using this interpolation method, we analyze the formulation of the single quark mass gap equation in dynamical forms between IFD and LFD. Examining that our interpolating results reproduce the IFD and LFD results previously obtained by others, we discuss the fate of the vacuum condensation, the chiral angle, and the effective mass in the limit to the IFD and the LFD. [Preview Abstract] |
Monday, January 30, 2017 4:30PM - 4:42PM |
U11.00006: Vector boson production in association with jets at CMS. Emanuela Barberis The production of vector bosons (V $=$ W, Z) in association with jets is a stringent test of perturbative QCD and is a background process in searches for new physics. Total and differential cross-section measurements of vector bosons produced in association with jets and heavy flavour quarks in proton-proton collisions performed by the CMS collaboration at the LHC are presented. The measurements are compared to the predictions of event generators and theoretical calculations. [Preview Abstract] |
Monday, January 30, 2017 4:42PM - 4:54PM |
U11.00007: Jet Energy Scale and Resolution Measurements at CMS Charles Harrington We present measurements of CMS jet energy scale (JES) corrections, based on a data sample collected in proton-proton collisions at a center-of-mass energy of 13 TeV. The corrections, extracted from data and simulated events from the combination of several channels and methods, account successively for the effects of pileup, simulated jet response, and residual JES eta and pT dependences. The jet energy resolution is measured in data and simulated events, where it is studied as a function of pileup and jet cone parameter R. The studies exploit events with dijet topology, photon+jet, Z+jet and multijet events. [Preview Abstract] |
Monday, January 30, 2017 4:54PM - 5:06PM |
U11.00008: Proton Scattering on Liquid Argon Ryan Bouabid LArIAT (Liquid Argon In A Test-beam) is a liquid argon time projection chamber (LArTPC) positioned in a charged particle beamline whose primary purpose is to study the response of LArTPC’s to charged particle interactions. This previously unmeasured experimental data will allow for improvement of Monte Carlo simulations and development of identification techniques, important for future planned LArTPC neutrino experiments. LArIAT’s beamline is instrumented to allow for the identification of specific particles as well as measurement of those particles' incoming momenta. Among the particles present in the beamline, the analysis presented here focuses on proton-Argon interactions. This study uses particle trajectories and calorimetric information to identify proton-Argon interaction candidates. We present preliminary data results on the measurement of the proton-Argon cross-section. [Preview Abstract] |
Monday, January 30, 2017 5:06PM - 5:18PM |
U11.00009: A Waveform Library Technique for Multi-Site Identification with the MAJORANA DEMONSTRATOR Micah Buuck The \textsc{Majorana Demonstrator} is a low-background array of 44.8 kg of germanium detectors searching for neutrinoless double-beta (0$\nu \beta \beta )$ decay in germanium-76, deployed 4,850 feet underground at the Sanford Underground Research Facility in Lead, South Dakota, USA. We aim to demonstrate background levels low enough to justify construction of a ton-scale experiment which will be able to fully probe the inverted-hierarchy region of the 0$\nu \beta \beta $ decay phase-space. In addition to reducing background through materials selection and experimental design, we are developing a range of analysis-based background-suppression techniques. One example is a waveform-library-based technique to reject background multi-site interactions. Here we present an overview of the technique and its current status. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, the Particle Astrophysics and Nuclear Physics Programs of the National Science Foundation, and the Sanford Underground Research Facility. [Preview Abstract] |
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