Bulletin of the American Physical Society
2020 Fall Meeting of the APS Division of Nuclear Physics
Volume 65, Number 12
Thursday–Sunday, October 29–November 1 2020; Time Zone: Central Time, USA
Session KK: Mini-Symposium: Short Range Correlations IV |
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Chair: Mark Strikman, PSU |
Saturday, October 31, 2020 8:30AM - 8:42AM |
KK.00001: ``Probing the Structure of the Deuteron at Very Short Distances'' Frank Vera, Werner Boeglin, Misak Sargsian We study the deuteron electro-disintegration at internal momenta above 700MeV/c for which first experimental data that are not dominated by final state interaction became recently available. Due to the high energy and relativistic nature of the process we developed an approach in which the scattering process is described in the light-cone reference frame where the light-front wave function is being probed. Our calculation show an appearance of a new structure in the deuteron light-front wave function which is related to the off-shell properties of the bound nucleon that does not appear in non-relativistic quantum mechanics. We present a first comparison of the new theoretical calculation with experimental data from Jefferson Lab and estimate the contribution from the above described new structure. We conclude the presentation with a discussion of the relevance of our studies to the short range structure of heavier nuclei as well as high density nuclear matter. [Preview Abstract] |
Saturday, October 31, 2020 8:42AM - 8:54AM |
KK.00002: Studying Short-Range Nucleon-Nucleon Correlations in Ar$^{40}$ with MicroBooNE Samantha Sword-Fehlberg Short-range nucleon-nucleon correlations (SRCs) are states in which the wavefunctions of two or more nucleons overlap for a short period of time. This period of strong overlap causes the correlated pair of nucleons to form a quasi-deuteron whose internal relative momentum is larger than the Fermi-momentum. When a correlated pair interacts with a leptonic probe, the two correlated nucleons are ejected from the nucleus with a definite momentum and angle with respect to each other. Although SRCs have been studied in great detail in electron-scattering experiments, their contributions to neutrino cross-section measurements are not well understood. Using the MicroBooNE detector, a liquid-argon time projection chamber located along the Booster Neutrino Beamline ($\langle$E$_{\nu}$ ~ 0.8 GeV$\rangle$) at Fermi National Accelerator Laboratory, we have developed an exclusive charged-current selection with 1 muon and 2 protons to compare with predictions from new nuclear models that contain the addition of SRC effects. We present here the status of this work. [Preview Abstract] |
Saturday, October 31, 2020 8:54AM - 9:06AM |
KK.00003: Probing deuteron short-range structure with tensor polarization and spectator tagging at EIC Wim Cosyn, Christian Weiss Deep-inelastic scattering on a polarized deuteron with detection of the spectator nucleon (spectator tagging) offers new opportunities for exploring the short-range structure of the deuteron and the properties of nucleon interactions. Tensor-polarized observables are unique to the interacting two-nucleon system (spin-1) and proportional to the D-wave amplitude of the internal motion. The detection of the spectator nucleon fixes the momentum in the initial deuteron configuration and allows one to control the relative magnitude of S- and D-waves. This makes it possible to measure the tensor-polarized asymmetry $A_{zz}$ in configurations where it attains its maximal values of +1 and -2, resulting in a large tensor-polarized signal. (In contrast, in inclusive DIS measurements without spectator tagging one measures only an average over all deuteron configurations, in which the tensor-polarized signal is reduced.) We comment on the feasibility of tensor-polarized tagging measurements at the future electron-ion collider with forward proton/neutron detectors, and the influence of nuclear final-state interactions on the tensor observables. [Preview Abstract] |
Saturday, October 31, 2020 9:06AM - 9:18AM |
KK.00004: Studying Nuclear Structure at Short Range with Real Photon Beams Phoebe Sharp Numerous experiments using electron beams have given us remarkable insight into the structure and dynamics of short range nucleon nucleon (NN) pairs. However, the results of those experiments all rely on a common set of assumptions about the reaction mechanics and final state interactions, which have yet to be tested and verified. New theoretical advances, specifically the effectiveness of scale separating techniques, indicate measurements with a real photon beam, having different reactions, final states, and kinematics, can test these foundational assumptions without the added complexity of a strongly interacting probe. An upcoming experiment in Jefferson Lab’s Hall D will study short range correlations (SRCs) using a 9GeV real photon beam on three targets: Carbon, Helium-4, and Deuterium, using the GlueX detector. This experiment will decisively test the phenomena of np (neutron-proton) dominance, the short-distance NN interaction, and reaction theory, while also providing new insight into bound nucleon structure and the onset of color transparency. This talk will present the status, simulations, and preparations for the running of this experiment. [Preview Abstract] |
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