Bulletin of the American Physical Society
82nd Annual Meeting of the APS Southeastern Section
Volume 60, Number 18
Wednesday–Saturday, November 18–21, 2015; Mobile, Alabama
Session F1: Hadronic Physics II |
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Chair: Simonetta Liuti, University of Virginia Room: Riverview Plaza Hotel Bon Secour Bay Ballroom I |
Friday, November 20, 2015 8:30AM - 9:06AM |
F1.00001: Studies of the 3D structure of the proton at JLab Invited Speaker: Andrey Kim The quark-gluon dynamics manifests itself in a set of non-perturbative functions describing all possible spin-spin and spin-orbit correlations. The Generalized Parton Distributions (GPDs) carry information not only on the longitudinal momentum but also on the transverse position of partons, providing rich and direct information on the orbital motion of quarks. The hard exclusive production of photons and pions provide a variety of spin and azimuthal angle dependent observables, sensitive to the dynamics of quark-gluon interactions. The study of the GPDs is one of the main goals of Jefferson Lab 12~GeV upgrade. In this talk, we present an overview of the current status and some future measurements of hard exclusive processes and extraction of underlying GPDs at Jefferson Lab. [Preview Abstract] |
Friday, November 20, 2015 9:06AM - 9:42AM |
F1.00002: Test Fundamental Symmetries via Precision Measurements of Light Meson Decays Invited Speaker: Liping Gan Light meson decays provide a unique laboratory to test fundamental symmetries and to search for new physics beyond the Standard Model (SM). There have been exciting experimental programs in the precision measurement of light pseudoscalar meson decays at Jefferson Laboratory. A comprehensive Primakoff experimental program is aimed at gathering high precision measurements on the two-photon decay widths and the transition form factors at low $Q^2$ of $\pi^0$, $\eta$ and $\eta^{\prime}$ via the Primakoff effect. The results of these measurements will provide sensitive probes to test the chiral anomaly and to study the origin and dynamics of chiral symmetry breaking. On the other hand, a recently developed Jlab Eta Factory (JEF) experiment will measure a various SM allowed or forbidden $\eta$ decays with a reduction of the background by almost two orders of magnitude in the rare neutral modes compared to other existed or planned experiments. It will offer a rich dataset to test confinement QCD symmetries and to probe new physics by searching for a dark leptophobic gauge boson and new C violating, P conserving force. A overview of these experimental activities and their physics impacts will be presented. [Preview Abstract] |
Friday, November 20, 2015 9:42AM - 10:18AM |
F1.00003: Solid Polarized Deuteron Targets Invited Speaker: Dustin Keller Nuclear and particle physics experiments using a solid polarized deuteron target attempt to extract a number of spin-1 polarized observables with optimal precision. A discussion is given on the techniques involved in polarizing and measuring the polarizations of a deuteron sample used in these fixed target experiments. Polarization optimization and recent developments at the University of Virginia Solid Polarized Target Lab are presented. These techniques are especially relevant for the scope of modern nuclear experiments at the Thomas Jefferson National Accelerator Facility. [Preview Abstract] |
Friday, November 20, 2015 10:18AM - 10:30AM |
F1.00004: Exploration of a High Luminosity 100 TeV Proton-Antiproton Collider Sandra Oliveros, Donald Summers, Lucien Cremaldi, John Acosta I will describe a 200 km circumference, 10$^{34}\,cm^{-2}\,s^{-1}$ luminosity 100 TeV proton-antiproton collider which could be constructed at CERN and connected to the LHC tunnel. A Fermilab-like antiproton source would be adapted with a dipole to disperse the antiprotons into 12 different momentum channels using electrostatic septa. This gives 12x more antiprotons to keep up with the high luminosity antiproton burn rate. Because the stochastic cooling time scales as the number of particles, the antiprotons would be stochastically cooled in 12 debuncher/momentum equalizer and 24 accumulator rings in parallel before electron cooling. Additionally, the antiprotons in the collider ring would be recycled during runs without leaving the collider ring, by joining them to new bunches with snap bunch coalescence and synchrotron damping. In proton-antiproton collisions, the cross sections for many high mass states is 10 times higher than in proton-proton collisions because antiquarks can come directly from antiprotons rather than gluon splitting. This allows lower beam currents, which reduces synchrotron radiation into superconducting magnets and vacuum systems. Finally, events are more central, allowing a shorter detector and a smaller $\beta^{*}$ for higher luminosity. [Preview Abstract] |
Friday, November 20, 2015 10:30AM - 10:42AM |
F1.00005: Performance and Capabilities of Double Neutrino Detectors with the Double Chooz Experiment Ben Rybolt The Double Chooz experiment was designed to measure anti-neutrino disappearance from nearby nuclear reactors with identical near and far detectors. We will provide a precise independent measurement of theta 13 mixing angle.The far detector has been taking data since 2011, while the near detector was completed in January 2015.With the near detector Double Chooz plans to explore details the distortion of the neutrino spectrum observed earlier by Double Chooz and other similar experiments.I present an overview of near and far detector performance and show the capability of two neutrino detectors to locate a hidden nuclear reactor. [Preview Abstract] |
Friday, November 20, 2015 10:42AM - 10:54AM |
F1.00006: Time Projection Chamber Calibration in the LArIAT Experiment Kevin Nelson The observation of neutrino oscillations proves that neutrinos have mass and has allowed experiments to study and measure components of the neutrino mixing matrix. A broad future experimental program seeks to expand on those measurements by testing the Standard Model and searching for charge parity violation. That program will utilize a new detector technology, the liquid argon time projection chamber (LArTPC), that is capable of imaging neutrino interactions with very high resolution. As part of the research and development effort we studied the performance and calibration of a LArTPC exposed to a charged particle testbeam at Fermilab in summer 2015. We have filtered the dataset to obtain a sample of events in which a single minimum ionizing particle traversed the TPC. These events were then reconstructed with hit finding and tracking algorithms. We will report on our studies of the energy scale, drift time, wire to wire calibration constants, and other detector performance metrics. The calibrations derived from the minimum ionizing tracks will be used in future analyses, including those of hadron interactions, electromagnetic shower reconstruction and electron vs. photon discrimination. [Preview Abstract] |
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