Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session FG: Mini-Symposium on Electro-weak Physics and Fundamental Symmetries III |
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Chair: Rakitha Beminiwattha, Louisiana Tech University Room: Marquis A |
Thursday, October 26, 2017 4:00PM - 4:12PM |
FG.00001: First Determination of the $^{27}$Al Neutron Distribution Radius from a Parity-Violating Electron Asymmetry Measurement Kurtis Bartlett The $Q_{weak}$ collaboration has made the first measurement of the parity-violating elastic electron-$^{27}$Al scattering asymmetry, an electroweak observable, using a spectrometer with an approximate energy acceptance of 150 MeV. This is a unique measurement as $^{27}$Al is a s-d shell nucleus with a $J^{p} = 5/2^{+}$ ground state, which is difficult to model compared to the doubly magic (closed shell) $J^{p} = 0^{+}$ ground state nuclei from similar experiments. The previous PREx and the upcoming PRExII and CREx experiments have used or plan to use these easier-to-model nuclei, $^{208}$Pb and $^{48}$Ca. The original intent of this measurement was as a background correction for the weak charge measurement of the proton. However, a 2014 paper outlined the possibility of extracting the $^{27}$Al neutron distribution radius from the elastic parity-violating asymmetry as a test of theoretical models. This elastic asymmetry can be extracted from this background measurement by correcting for known asymmetries that arise from non-elastic scattering processes. Presented here is a discussion of the analysis required to extract this asymmetry and the neutron distribution radius, along with its impact on theoretical models for lighter non-closed shell nuclei. [Preview Abstract] |
Thursday, October 26, 2017 4:12PM - 4:24PM |
FG.00002: Beyond-Standard-Model Interactions and Hadron Phenomenology Simonetta Liuti I will discuss the impact of recent developments in hadron phenomenology on extracting possible fundamental tensor interactions beyond the standard model. A novel class of observables, including the chiral-odd generalized parton distributions, and the transversity parton distribution function can contribute to the constraints on this quantity. Dedicated analyses for the extraction of the scalar and tensor hadronic matrix elements at both Jlab @ 12 GeV and at the future EIC will provide sufficiently precise measured values in addition to a, so far, absent testing ground for lattice QCD calculations. [Preview Abstract] |
Thursday, October 26, 2017 4:24PM - 4:36PM |
FG.00003: Precision Electroweak Observables of Three-Nucleon Systems Jared Vanasse At low energies interactions between nucleons can be described in a theory of contact interactions known as pionless effective field theory. This theory is ideally suited to low energies and to calculating bound state properties of three-nucleon systems. I will discuss recent calculations of electroweak properties of three-nucleon systems, the prospects for future precision calculations of such properties, and their potential impact on the extraction of the charge radius from muonic Helium-3 data. [Preview Abstract] |
Thursday, October 26, 2017 4:36PM - 4:48PM |
FG.00004: Parity-Violating Neutron Spin Rotation in n-4He Murad Sarsour The neutron spin rotation (NSR) collaboration used parity-violating spin rotation of transversely polarized neutrons transmitted through a 0.5 m liquid helium target to constrain weak coupling constants between nucleons. While consistent with theoretical expectation, the upper limit set by this measurement on the rotation angle, d$\phi$/dz = [+1.7 $\pm$ 9.1(stat.) $\pm$ 1.4(sys.)]$\times10^{-7}$ rad/m, is limited by statistical uncertainties. The NSR collaboration is preparing a new measurement to improve this statistically-limited result by about an order of magnitude. In addition to using the new high-flux NG-C beam at the NIST Center for Neutron Research, the apparatus was upgraded to take advantage of the larger-area and more divergent NG-C beam. In addition, significant improvements are being made to the cryogenic design. The upgraded apparatus was used with a room temperature target for another project at LANSCE and performed very well. Details of these improvements and readiness of the upgraded apparatus will be discussed. We will also comment on how recent theoretical work combining effective field theory techniques with the $1/N_{c}$ expansion of QCD along with previous NN weak measurements can be used to make a prediction for d$\phi$/dz in $n$+$^4$He. [Preview Abstract] |
Thursday, October 26, 2017 4:48PM - 5:00PM |
FG.00005: Parity Violation in DIS region with SoLID at the upgraded 12 GeV JLab Ye Tian In this talk, an overview of PVDIS future experiment by using a Solenoidal Large Intensity Device (SoLID) at Jefferson Lab (JLab) Hall A with the $12$ GeV upgrade, along with a brief description of the proposed SoLID spectrometer is discussed. We will obtain data with high statistic and large kinematic coverage for Bjorken $0.3 |
Thursday, October 26, 2017 5:00PM - 5:12PM |
FG.00006: Parity Violation in Deep Inelastic Scattering in Hall C at JLab Mark Macrae Dalton, Cynthia Keppel, Kent Paschke The measurement of parity-violation in inclusive electron deep inelastic scattering (DIS) from a proton or deuteron target can be used to study the flavor structure of the nucleon. While valence quark parton distribution functions (PDF) can be probed in high-$x$ measurements such as with the proposed SoLID spectrometer, complementary measurements are possible at moderate $x \sim 0.1$ where the sea quarks may still play a significant role. In particular, such measurements would provide a cleanly interpretable measurement of the strange quark PDF. These measurements are possible with the upgraded CEBAF accelerator at JLab and do not require significant new experimental hardware. The prospects and potential impacts of such a measurement will be presented. [Preview Abstract] |
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