Bulletin of the American Physical Society
86th Annual Meeting of the APS Southeastern Section
Volume 64, Number 19
Thursday–Saturday, November 7–9, 2019; Wrightsville Beach, North Carolina
Session G03: Nuclear Physics |
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Chair: Simon Taylor, Jefferson Laboratory Room: Holiday Inn Resort Turtlewatch |
Friday, November 8, 2019 2:00PM - 2:30PM |
G03.00001: The Hall A APEX experiment Invited Speaker: Alexandre Camsonne The Hall A APEX experiment is looking for a new interaction mediated by a light boson A'. The APEX experiment successfully ran in Hall A from January to March 2019. I will present the specific Hall A experimental setup, the expected sensitivity for the experiment and preliminary results on the detector calibration. [Preview Abstract] |
Friday, November 8, 2019 2:30PM - 3:00PM |
G03.00002: Fragmentation at large-z Invited Speaker: Tianbo Liu The COMPASS collaboration published precise data on production cross section of charged hadrons in lepton-hadron semi-inclusive deep inelastic scattering, showing almost an order of magnitude larger than next-to-leading order QCD calculations when $P_{h_T}$ and $z_h$ are sufficiently large. We explore the role of power corrections to the theoretical calculations, and quantitatively demonstrate that the power corrections are extremely important for these data when the final-state multiplicity is low and the production kinematics is near the edge of phase space. Our finding motivates more detailed studies on power corrections for upcoming experiments at Jefferson Lab, as well as the future Electron-Ion Collider. [Preview Abstract] |
Friday, November 8, 2019 3:00PM - 3:30PM |
G03.00003: Prospects for Studying Photoproduction on Nuclear Targets with the GlueX Detector Invited Speaker: Alexander Somov The GlueX detector in the experimental Hall D at Jefferson Lab was designed to search for gluonic excitations in the spectra of light mesons using photon beams. The detector provides a unique capability to study photoproduction on nuclear targets and extend the physics potential beyond the main spectroscopy program. A recently approved experiment in Hall D will study short-range correlated (SRC) pairing of nucleons within nuclei and search for Color Transparency (CT) at large momentum transfer. SRC has never been studied in photoproduction before. GlueX measurements will provide a complementary check of the reaction mechanism to electron and proton scattering. Measurement of the Color Transparency will verify recent theoretical calculations for GlueX beam energies and will decisively test the onset of CT. Several other physics topics are considered for GlueX, such as the study of the hadronic structure of the photon by measuring nuclear transparency of vector mesons, and extraction of the cross section of longitudinally polarized omega mesons on nucleons for the first time. The measurement of nuclear transparency over a wide energy range is important for understanding results from other experiments and will provide a sensitive probe to the degree of photon shadowing in nuclear matter. I will give an overview of the proposed physics program and discuss GlueX plans for the future. [Preview Abstract] |
Friday, November 8, 2019 3:30PM - 3:42PM |
G03.00004: The Nab Experiment: Studying Unpolarized Neutron Beta Decay Correlations Jason Fry Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover the details of the weak interaction. Neutron beta decay can evaluate the ratio of axial-vector to vector coupling constants in the standard model, $\lambda = G_A / G_V$, through multiple decay correlations. The Nab experiment will make measurements of the electron-neutrino correlation parameter $a$ with a precision of $\delta a / a = 10^{-3}$ and the Fierz interference term $b$ to $\delta b = 3\times10^{-3}$ in unpolarized free neutron beta decay. These results aim to deliver an independent determination of the ratio $\lambda$ that will sensitively test CKM unitarity, independent of nuclear models. Nab utilizes a novel, long asymmetric spectrometer that guides the decay products to two large area silicon detectors in order to precisely determine the electron energy and proton momentum. The Nab apparatus is under installation and commissioning on the Fundamental Neutron Physics Beamline at the SNS at ORNL. We will present updates and an overview of the Nab experiment. [Preview Abstract] |
Friday, November 8, 2019 3:42PM - 3:54PM |
G03.00005: Self-energies in a relativistic chiral effective theory Marston Copeland, Chueng-Ryong Ji, Wally Melnitchouk We calculate the self-energies of the flavor SU(3) octet and decuplet baryons, using a relativistic chiral effective theory framework consistent with Lorentz and gauge invariance. The results are compared using several different regularization prescriptions, including the finite-range regularization, Pauli-Villars, and dimensional regularization, which are shown to yield the same leading nonanalytic behaviors in the chiral limit, as expected in QCD. There is an emphasis on the full relativistic finite-range regularization, and new details of this calculation are explored for self-energies. [Preview Abstract] |
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