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 G14: Opportunities for Future Hadron Structure Measurements with Large Acceptance at High Luminosity IIILive
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Sponsoring Units: DNP Chair: Alexandre Camsonne, Jlab |
Sunday, April 18, 2021 8:30AM - 8:42AM Live |
G14.00001: Accessing the QCD Van der Waals force with SoLID-J/ψ and beyond Sylvester Joosten, Chao Peng, Zein-Eddine Meziani The future SoLID-$J/\psi$ experiment at Jefferson Lab combines high luminosity with a large acceptance detector to enable a fully differential measurement of near-threshold $J/\psi$ photo- and electroproduction cross-section with high statistical precision. This measurement is sensitive to the non-perturbative gluonic interaction between the $J/\psi$ and the nucleon. This interaction could give rise to a purely gluonic binding force between both color-neutral particles: a QCD Van der Waals force between two color dipoles. I will discuss the impact of SoLID-$J/\psi$ on our understanding of this binding force and further opportunities with nuclear targets. [Preview Abstract] |
Sunday, April 18, 2021 8:42AM - 8:54AM Live |
G14.00002: Study the Origin of Proton Mass with Near Threshold J/$\psi$ Production Chao Peng Nucleons compose almost all visible mass in our universe. Yet, our understanding of nucleon mass, especially the QCD trace anomaly's role, is still limited. Production of $J/\psi$ near its threshold provides a unique probe to the nucleon's gluonic structure, enabling access to the dynamic origin of the nucleon mass. The SoLID-$J/\psi$ experiment (JLab E12-12-006) will measure the near-threshold differential $J/\psi$ production cross-section with high statistical precision and obtain crucial input to determine the trace anomaly contribution to the proton mass. I will discuss the projected impact on the trace anomaly term from the SoLID-$J/\psi$ experiment and the complementarity of SoLID-$J/\psi$ with the future EIC experiments. [Preview Abstract] |
Sunday, April 18, 2021 8:54AM - 9:06AM Live |
G14.00003: Towards counting DAQ for PVDIS with SoLID Hanjie Liu As high precision measurements, parity violating asymmetry experiments require high statistics. To achieve the designed statistical uncertainties, the event rate could be a few hundred kHz up to a hundred GHz. For these ultra high rate parity violating asymmetry measurements, an integrating data acquisition (DAQ) system or scaler-based DAQ is usually used during the main physics measurement, which avoids the necessity for detailed signal information from the detectors. The counting DAQ system, which records all the detailed detector signals, is only used for determining the kinematics, acceptance, and validating background modeling with a low beam current applied. In recent years, with the development of FPGA based modules at Jefferson Lab, using a counting DAQ to read out the detector signals with negligible dead time at a few hundred kHz is achievable, therefore it can be used for the main asymmetry measurement. This is crucial for parity violating asymmetry measurement in deep inelastic scattering (PVDIS) with SoLID to reject the pion background. As part of the SoLID project R\&D, a thorough DAQ testing and optimization is planned, which will help mitigate the risks and costs for the asymmetry experiments. The plans and status of the DAQ R\&D are presented. [Preview Abstract] |
Sunday, April 18, 2021 9:06AM - 9:18AM Live |
G14.00004: Parity Violating Deep Inelastic Scattering with SoLID at JLab Weizhi Xiong The Solenoidal Large Intensity Device (SoLID) has been proposed at Jefferson Lab. The device will provide a large-acceptance and is designed to handle high-luminosity in order to study parity-violating deep inelastic scattering (PVDIS) as well as the QCD structure of the proton. We plan to measure the parity-violating asymmetry with high statistics and large kinematic coverage ($0.3 < x < 0.7$, 2 GeV$^{2}$ $<$ Q$^{2}$ $<$ 12 GeV$^{2}$) using a polarized electron beam. By measuring the PVDIS process from an unpolarized deuterium target, we aim to precisely determine the vector-electron and axial-quark coupling, which provides a unique way to test the Standard Model and search for new physics compared with other parity-violating electron scattering processes. This measurement can also be used to study charge symmetry violation in the PDFs as well as higher-twist effects with quark-quark correlations. In addition, we also plan to measure the asymmetry with a hydrogen target, which allows for an extraction of the $d/u$ PDF ratio without any nuclear correction. In this talk, we will provide a brief review for these physics topics as well as an overview for the PVDIS experiment using SoLID. [Preview Abstract] |
Sunday, April 18, 2021 9:18AM - 9:30AM Live |
G14.00005: High rate bench test of MaPMT and frontend electronics for SoLID Cherenkov detectors Bishnu Karki The proposed Solenoidal Large Intensity Device (SoLID), a large acceptance spectrometer at Jefferson Lab, can handle high luminosities ($10^{37}$ - $10^{39}$ cm$^{-2}$s$^{-1}$) and cover the full 2$\pi$ azimuthal angular range. The raw detector rate in Cherenkov detectors, used for particle identification in SoLID, is estimated to be as high as 4 MHz/PMT. The readout system for the Cherenkov detectors should be compatible with the high rate expected in the SoLID. To check and confirm the expected performance, we have tested Multi-anode PMT (MaPMT) and frontend electronics using lasers and LEDs to such a high rate to mimic the SoLID running conditions. In this talk, I will present our test results and discuss its performance. \footnotetext[1]{This work is supported by the Research Subcontract No. 0F-60069 from Argonne National Laboratory.} \footnotetext[2]{Acknowledgement: the SoLID collaboration, especially Zhiwen Zhao, Benjamin Raydo, Andrew Smith, Alexandre Camsonne, Marco Contalbringo, Jack McKisson, Roberto Malaguti, Jeff Wilson, and Haiyan Gao.} [Preview Abstract] |
Sunday, April 18, 2021 9:30AM - 9:42AM Live |
G14.00006: Electromagnetic calorimeter for SOLID Jixie Zhang The Solenoidal Large Intensity Device (SoLID) was proposed to build at Hall A, Jefferson Lab. SoLID is a general-purpose device designed to handle high luminosity ($10^{37}-10^{39}$~cm$^{-2}$s$^{-1}$), with a wide momentum and a full 2$\pi$ azimuthal angular coverage. The electromagnetic calorimeter (ECal) is part of the key detectors of SoLID. It is a full-absorption calorimeter consisting of preshower and Shashlyk-type shower modules. Several prototype preshower and shashlyk modules of SoLID were built and tested with cosmics. A beam test is being planned using the Fermilab test beam facility (FTBF) in January of 2021. In this talk, we will present the design and the test performance of SoLID ECal. [Preview Abstract] |
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