Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session D11: Opportunities for Future Hadron Structure Measurements with Large Acceptance at High Luminosity ILive Mini-Symposium
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Sponsoring Units: DNP Chair: Zhihong Ye, Tsinghua University |
Saturday, April 17, 2021 1:30PM - 2:06PM Live |
D11.00001: Overview of the proposed Solenoidal Large Intensity Device (SoLID) and its physics programs at Jefferson Lab Invited Speaker: Haiyan Gao The proposed Solenoidal Large Intensity Device (SoLID) at Jefferson Lab is a large acceptance forward scattering spectrometer with full azimuthal angular coverage capable of handling high luminosities ($10^{37}$ – $10^{39}$/cm$^2$/s) with a variety of polarized and unpolarized targets. Highly impactful experiments utilizing this device have been approved by the Jefferson Lab program advisory committee. These include the tomography of the nucleon in three-dimensional momentum space through semi-inclusive deep-inelastic scattering measurements and precise determination of tensor charges providing benchmark tests of lattice QCD calculations; pushing the frontiers in the search of new physics and of hadronic physics using parity-violating deep inelastic scattering; and precise measurement of differential electro- and photo- production cross section of $J/\Psi$ near threshold to access the QCD trace anomaly, probe the strength of the color van der Waals force, and search for possible LHCb charm pentaquarks. In this talk, I will provide an overview of the proposed SoLID device, and focus on the approved physics programs. I will conclude by mentioning additional experiments which can run parasitically with the approved experiments. [Preview Abstract] |
Saturday, April 17, 2021 2:06PM - 2:18PM Live |
D11.00002: SoLID SIDIS $^3$He/$n$ Experiments at Jefferson Lab Tianbo Liu Semi-inclusive deep-inelastic scattering (SIDIS), which simultaneously detects the scattered lepton and a hadron in the final state, is one of the main processes to investigate transverse momentum dependent parton distributions (TMDs). The proposed Solenoidal Large Intensity Device (SoLID) in Hall A at Jefferson Lab will make an unprecedentedly precise measurement of TMDs in the valence quark region. In this talk, we will focus on the two approved SIDIS experiments with transversely and longitudinally polarized $^3$He targets, which serve as effectively polarized neutron targets. Both $11\,\rm GeV$ and $8.8\,\rm GeV$ beams will be utilized for wide kinematic coverage. The high statistics from the high luminosities and large acceptance will allow for four dimensional binning of single-spin and double-spin asymmetry measurements with high precision. Combining the $^3$He and the proton SIDIS data to be collected in another SoLID experiment, one will be able to have the flavor separation in the extraction of corresponding TMDs. Taking the Sivers and transversity distributions as examples, we will present the SoLID SIDIS program's physics impact. We will also discuss the SoLID projection of the tensor charge and its impact on new physics explorations. [Preview Abstract] |
Saturday, April 17, 2021 2:18PM - 2:30PM Live |
D11.00003: SoLID SIDIS proton target experiment at Jefferson Lab Vladimir Khachatryan One of the upcoming experiments within the semi-inclusive deep-inelastic scattering (SIDIS) program, which is planned to be carried out using the proposed Solenoidal Large Intensity Device (SoLID) at Jefferson Lab, will be on the transversely polarized proton (NH$_3$) target. The SIDIS-NH$_3$ target experiment will allow for multidimensional binned measurements of the Collins, Sivers and Pretzelosity single spin azimuthal asymmetries of the proton in the valance quark region, by having high statistics and well-controlled systematics. Along with another similar experiment on the transversely polarized ${}^3$He (neutron) target, the Collins asymmetry measurement will allow the quark tensor charge extraction, via the u and d quark flavor separation. The Sivers and Pretzelosity asymmetry measurements will help uncover information about the orbital angular momentum of the partons inside the nucleon. In this talk, we will give details on the SIDIS-NH$_3$ experimental setup as well as present the most recent study on the SoLID tensor charge, transversity and Sivers projections for the u and d quarks, in comparison with the available world data. [Preview Abstract] |
Saturday, April 17, 2021 2:30PM - 2:42PM Live |
D11.00004: SoLID Kaon SIDIS Measurements with Polarized Targets Sanghwa Park We plan to perform a measurement of the kaon production in the Semi-Inclusive Deep Inelastic Scattering (SIDIS) with SoLID using both the transversely polarized proton target and the transversely polarized 3He target as effective polarized neutron target. This measurement will be carried out in parallel with two already approved SoLID SIDIS experiments which will measure the pion production (E12-10-006 and E12-11-108). We will perform the offline analysis to identify the kaon events using high precision time-of-flight information, then extract the kaon Collins asymmetries, Sivers asymmetries and other TMD asymmetries. New data from this measurement will provide not only important input to determine the TMDs of u and d quarks by combining with the pion measurements from SoLID and elsewhere, but also has the unique sensitivity to sea quarks. Our measurement will have an important contribution to the development of the TMD physics and provide important guidance for studying sea quark and gluon TMDs at the future Electron-Ion Collider. [Preview Abstract] |
Saturday, April 17, 2021 2:42PM - 2:54PM Live |
D11.00005: Target Single Spin Asymmetry in DIS $\vec{N}(e,e^\prime)$ using Transversely Polarized Proton and Neutron ($^3$He) Targets Todd Averett We present an experiment to measure the transversely polarized target Single Spin Asymmetry (SSA) from inclusive DIS $\vec{N}(e,e^\prime)$ using transversely polarized NH$_3$ and $^3$He targets. This experiment will be carried out in Hall A using the large acceptance solenoid spectrometer (SoLID). The SSA, $A_{UT}$, is expected to have a $\sin(\phi_S)$-dependence, where $\phi_S$ is the azimuthal angle of the target polarization relative to the electron plane and perpendicular to the virtual photon direction. At Born level, the asymmetry is identically zero due to time-reversal invariance and parity conservation. However, it can be non-zero when two-photon exchange is included and therefore provides fertile ground for studying this processes in the absence of a large Born contribution. Parton-model predictions for the intermediate state of the nucleon during two-photon exchange predict asymmetries from $\pm (10^{-4} - 10^{-2}$) depending on model input and target nucleon. This experiment is expected to reach a statistical uncertainty of $\sim 10^{-4}$ at $Q^2 = 1.5$ GeV$^2$ up to $\sim 10^{-3}$ at $Q^2 = 7.5$ GeV$^2$ with $W > 2$ GeV and $0.05 < x < 0.65$. [Preview Abstract] |
Saturday, April 17, 2021 2:54PM - 3:06PM Live |
D11.00006: A Precision Measurement of Inclusive $g^{n}_{2}$ and $d^{n}_{2}$ with SoLID on a Polarized $^{3}$He Target at $8.8$ and $11$ GeV Ye Tian, Chao Peng A precision measurement of inclusive neutron spin structure function $g_{2} (x,Q^{2})$, which will be run in parallel with E12-10-006 and E12-11-007 experiments by using a Solenoidal Large Intensity Device (SoLID) at Jefferson Lab (JLab) Hall A, was approved by JLab PAC48, 2020. In the proposed experiment, high statistics data will be collected within a large kinematic coverage of Bjorken scaling $x > 0.1$ and four momentum transfer $ 1.5 |
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