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 E11: Opportunities for Future Hadron Structure Measurements with Large Acceptance at High Luminosity IILive
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Sponsoring Units: DNP Chair: Vladimir Khachatryan, Duke |
Saturday, April 17, 2021 3:45PM - 3:57PM Live |
E11.00001: Deep Exclusive $\mathrm\pi^-$ Production using a Transversely Polarized $\mathrm{^{3}He}$ Target and the SoLID Spectrometer Garth Huber The $\sin(\phi-\phi_S)$ and $\sin(\phi_S)$ Fourier amplitudes of the single-spin azimuthal asymmetry in exclusive electroproduction of charged pions from transversely polarized nucleons have been noted as providing unique views of nucleon structure. The $\sin(\phi-\phi_S)$ amplitude is expected to be particularly sensitive to the spin-flip generalized parton distribution (GPD) $\tilde{E}$, yielding structure information unlikely to be obtained from any other source. The $\sin(\phi_S)$ amplitude is also extremely important, as it provides powerful constraints on the transversity GPDs. The only measurements to date of these quantities were published by the HERMES Collaboration in 2010. The high luminosity and large acceptance capabilities of the proposed Solenoidal Large Intensity Detector (SoLID) at Jefferson Lab would allow an improved measurement with broader kinematic coverage and significantly reduced errors. I will present projections using a transversely polarized $^3$He target and the $\vec{n}(e,e'\pi^-p)$ reaction. [Preview Abstract] |
Saturday, April 17, 2021 3:57PM - 4:09PM Live |
E11.00002: Exploring GPDs using Timelike Compton Scattering with SoLID at Jefferson Lab Zhiwen Zhao To understand the nucleon structure described by Generalized Parton Distributions, Timelike Compton Scattering (TCS) has become a new and unique tool. It is sensitive to the same GPDs which the spacelike deeply virtual Compton scattering (DVCS) also accesses and can be used to test GPD universality. The TCS reaction ($\gamma + p \rightarrow e^+ + e^- + p$) has multiple final state particles and small cross section. A large acceptance and high luminosity ($10^{37}$/cm$^2$/s) detector like SoLID is ideal to cover its physics in broad kinematic space. The experiment will collect high quality data to provide crucial input for global fits of GPDs. In this talk, I will give an overview of the planned experiment and highlight some projected physics results. [Preview Abstract] |
Saturday, April 17, 2021 4:09PM - 4:21PM Live |
E11.00003: Double Deeply Virtual Compton Scattering using SoLID apparatus Alexandre Camsonne Jefferson Laboratory with the current 12 GeV upgrade and a major program focused on the Generalized Parton Distributions (GPDs) has the opportunity to explore the Doubly Deeply Virtual Compton Scattering (DDVCS) process which would allow to probe GPDs surface for skewness different from the generalized bjorken variable. Such an experiment requires high luminosity because of a cross section about 100 times smaller than regular Deeply Virtual Compton Scattering. The Solenoidal Large Intensity Device (SoLID) is a solenoidal detector equipped with Gas Electron Multiplier trackers, calorimetry and Cerenkov detectors design to run at high luminosity up to 10$^{\mathrm{39}}$cm$^{\mathrm{-2}}$s$^{\mathrm{-1}}$. We are proposing to supplement the baseline detector with muon detection to study the DDVCS in the dimuons channel. I will present two possible experiments using the SoLID apparatus. One which would run concurrently with currently approved J/Psi experiment and one with a dedicated setup optimized for high luminosity and for the DDVCS kinematic. I will discuss the different setups and present the physics reach of the two proposed experiments. [Preview Abstract] |
Saturday, April 17, 2021 4:21PM - 4:33PM Live |
E11.00004: SoLID DVCS Measurement with Polarized Protons and Neutrons Zhenyu Ye, Zhihong Ye We propose to perform the asymmetry measurements of the deeply virtual Compton scattering (DVCS) off transversely and longitudinally polarized proton and neutron targets using the proposed solenoidal large acceptance device (SoLID) in Hall-A. The spin azimuthal dependence of the asymmetries, $A^{p, n}_{UL, UT, LL, LT}$, in a wide range of kinematic regions are essential to systematically extract distributions of different Compton form factors (CFFs) corresponding to the integrals of Generalized Parton Distributions (GPDs). The high luminosity and large acceptance features of the SoLID will allow precision measurement of both the proton and neutron CFFs in the same experimental setup which are important to extract the valance-quark GPDs via the flavor decomposition. In particular, the GPD E$_n$ is barely measured and new data are urgently needed for the study of J$_u$ and J$_d$ in the Ji’s sum rule. We plan to run the experiment in parallel with the approved SIDIS experiments with a minimum modification of the trigger system to enable the detection of high energy photons from the DVCS events. We will also discuss the possibility of enhancing the detector performance to unlock the full power of DVCS measurement on SoLID. [Preview Abstract] |
Saturday, April 17, 2021 4:33PM - 4:45PM Live |
E11.00005: Exploring Gluon GPDs Through $\phi$ Meson Production with the SoLID Detector at Jefferson Lab Michael Paolone Through deeply virtual meson production (DVMP) in the valence region, one can exploit the quark disparity between target nucleons or nuclei (comprised almost entirely of up-down quarks) and produced vector-meson quark-antiquark pairs (with flavor strange or heavier) to access the gluon generalized parton distributions (GPDs) of the target. The future SoLID-$J/\psi$ experiment could be the perfect stage to measure $\phi$ DVMP in the valence region. This talk will discuss possibilities to measure strangeonium production and which decay-channels, targets, and kinematic regions are accessible with the SoLID detector. [Preview Abstract] |
Saturday, April 17, 2021 4:45PM - 4:57PM Live |
E11.00006: Results from a recent beam test of a Cherenkov prototype for SoLID Simona Malace Prototypes of Cherenkov photodetectors for SoLID were tested in beam in Hall C at Jefferson Lab during 2020. A 4x4 array of maPMTs~ was tested with a CO2 radiator in both low and high rate configurations. A LAPPD from Incom was tested as well with both CO2 and C4F8 radiators in a low rate configuration. I will present preliminary results from these tests and I will discuss the relevance of these results for SoLID. [Preview Abstract] |
Saturday, April 17, 2021 4:57PM - 5:09PM Live |
E11.00007: Accessing weak neutral-current coupling $C_{3q}$ using positron and electron beams at Jefferson Lab Xiaochao Zheng Electroweak neutral-current couplings are important parameters of the Standard Model of particle physics. The product of lepton and quark couplings, $C_{1q}$, $C_{2q}$ and $C_{3q}$, or $g_{AV}^{eq}$, $g_{VA}^{eq}$ and $g_{AA}^{eq}$, can be accessed in lepton scattering off a nucleon or nuclear target. Recent parity violation electron scattering experiments at Jefferson Lab have improved the precision of the $C_{1q,2q}$ couplings. On the other hand, the $C_{3q}$ couplings can only be measured by comparing scattering cross sections between a lepton and an anti-lepton beam, and have been measured only once at CERN. In this talk, we present the definitions and current knowledge of the $C_{1q,2q,3q}$ and how to access them in charged lepton scattering. We found the DIS cross section asymmetry between an electron and a positron beam scattering off an isoscalar target arise purely from $C_{3q}$. We present at the end exploratory calculations for possible measurements of $C_{3q}$ using the planned SoLID spectrometer and a positron beam at Jefferson Lab. [Preview Abstract] |
Saturday, April 17, 2021 5:09PM - 5:21PM Live |
E11.00008: Nucleon structure study using parity violation in deep inelastic scattering with SoLID Yuxiang Zhao Measurements of parity-violating asymmetries in Deep Inelastic Scattering (PVDIS) was used as a powerful tool to establish the Electroweak standard model of particle physics in the 1970's. Recently, it has also been used to search for physics beyond the Standard Model. In this talk, I will present the potential of PVDIS for the nucleon spin structure study with SoLID. In particular, scattering of an unpolarized electron beam off a longitudinally polarized target is parity-violating and will provide us a new series of $\gamma Z$ interference structure functions. These new structure functions have different flavor compositions from the parity conserving spin structure functions. They can be used as a clean method to extract flavor-separated polarized PDFs. [Preview Abstract] |
Saturday, April 17, 2021 5:21PM - 5:33PM Live |
E11.00009: Charged Lepton Flavor Violation with SoLID Yulia Furletova, Alexandre Camsonne A high intensity beam at JLAB in the Continuous Electron Beam Accelerator Facility (CEBAF) allows for a study of Charged Lepton Flavor Violation (CLFV) through a search for the process eN$\to \mu $X. Many Beyond the Standard Model scenarios, including Leptoquark exchange, allow for CLFV rates that are within reach of current or future planned experiment such as SoLID. It would allow to improve by up to two orders of magnitude over existing limits from searches at HERA and would complement the stringent limits obtained from other low energy experiments. [Preview Abstract] |
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