Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session M17: Hadronic Physics: General |
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Sponsoring Units: GHP Chair: Xuan Li, Los Alamos Natl Lab Room: Marquette VIII - 2nd Floor |
Monday, April 17, 2023 10:45AM - 10:57AM |
M17.00001: Polarized Poistron Experiments at Jefferson Lab Douglas W Higinbotham Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF) has been delivering high polarization and high current electron beams for fixed target nuclear physics experiment for more then two decades. Plans are now being developed to be able to using this same accelerator to provide highly polarized positrons to the experimental halls. This work builds on the succesful Polarized Electrons for Polarized Positrons (PEPPo) project which demonstrated the possibity of using polarized electrons for making a polarized postrion source. This talk will give an overview of the planned polarized positron source as well as an overview of the science that has been proposed to be done with this upgrade to the Jefferfson Lab accelerator. |
Monday, April 17, 2023 10:57AM - 11:09AM |
M17.00002: MUSE - The Muon proton Scattering Experiment Evangeline J Downie MUSE, the Muon proton Scattering Experiment was originally motovated by the proton radius puzzle (PRP). The PRP began in 2010 when the CREMA Collaboration released their measurement of the proton radius (Pohl et. al (2010)) from muonic hydrogen spectroscopy: rp=0.84184(67) fm, This was five standard deviations smaller that the accepted CODATA value at that time (0.8768(69) fm), and sparked an enduring and intriguing puzzle. This puzzle has been addressed in repeated electron scattering measurements seeking to go lower in Q2, such as PRad at Jefferson Lab, and the Mainz Initial State Radiation experiment. There have also been a plethora of new atomic hydrogen spectroscopy experiments, and some more muonic atom spectroscopy. MUSE, the MUon proton Scattering Experiment, was first proposed in 2012 to be the first muon proton elastic scattering experiment with sufficient precision to address the proton radius puzzle. MUSE, measuring in the PiM1 area of the Paul Scherrer Institute, has the capacity to simultaneously measure elastic muon-proton, and electron-proton scattering, and switch polarities to measure with opposite charge states, giving access to cross sections, extracted radii, and two-photon measurements for muons and electrons. As such, MUSE can directly measure the two-photon effect by comparing charge-states, and directly compare muon and electron scattering. This will allow reduction of the systematic uncertainty due to the partial cancellation of uncertainties by simultaneous and / or subsequent measurements within the same apparatus. The motivation for and status of MUSE, which has now begun measurement, will be reviewed. |
Monday, April 17, 2023 11:09AM - 11:21AM |
M17.00003: Are gluon showers inside a QGP strongly or weakly coupled ? a theorist's test Omar Elgedawy, Peter B Arnold, Shahin Iqbal Jets produced from colliding two heavy nuclei play an important role in understanding properties of the Quark Gluon Plasma. During their travel through the medium, high energy partons lose energy through splitting processes like bremsstrahlung and pair production, induced by elastic scatterings with the medium. In the high energy limit, these splitting processes are coherent over large distances and the underlying elastic scatterings can no longer be treated as quantum mechanically independent, leading to a suppression of the splitting rate known as the Landau-Pomeranchuk-Migdal effect. An important question is whether consecutive splittings are themselves quantum mechanically independent or instead overlap significantly. Previously, the overlap of splitting rates has been calculated in the soft bremsstrahlung limit and it was found that such corrections are large but can be absorbed into an effective value of the jet-quenching parameter q^ that characterises properties of the medium. We investigate a measure of overlap effects that cannot be absorbed into an effective value of q^ in the simplest theoretical situation, which includes imagining a very large, static, homogeneous medium and taking the large Ncolor limit. |
Monday, April 17, 2023 11:21AM - 11:33AM |
M17.00004: Charged Pion Multiplicities in SIDIS Electroproduction Hem D Bhatt The experiments E12-09-002 and E12-09-017, which were completed in 2019 at Jefferson Lab Hall C, measured semi-inclusive charged pion electroproduction from hydrogen and deuterium. Our aim is to quantify charge symmetry violation (CSV) in valence quark distributions and also study the transverse momentum dependence of semi-inclusive pion production. In this talk, we will present some preliminary results on charged pion multiplicities and provide updates on the current analysis. |
Monday, April 17, 2023 11:33AM - 11:45AM |
M17.00005: Inclusive electron scattering off the proton with CLAS12 at JLab Valerii Klimenko Electron scattering data off protons from the CLAS12 detector in Hall B at Jefferson Laboratory have become available and cover a wide kinematic range in W up to 2.5 GeV and Q2 up to 9 GeV2, offering new opportunities to explore inclusive, semi-inclusive, and fully exclusive reactions. A study that aims to extract the inclusive electroproduction cross sections from the CLAS12 data collected at a beam energy of 10.6 GeV from an unpolarized liquid-hydrogen target is now almost finished and preliminary results will be presented. Because of the large acceptance of CLAS12, these data offer a unique opportunity to measure inclusive cross sections at W from the meson electroproduction threshold to 2.5 GeV within any given Q2-bin from 2.5 to 9 GeV2. This unique W- coverage at fixed Q2-values is of particular importance for the extension of our knowledge on the nucleon parton distribution function from the data on F2 structure function in the resonance region by employing the existing CLAS results on the γpN* electroexcitation amplitudes. These studies also offer valuable input for the exploration of quark-hadron duality. |
Monday, April 17, 2023 11:45AM - 11:57AM |
M17.00006: The Gas Ring Cherenkov Detector for Jefferson Lab, Hall A Maria T Satnik The Gas Ring Cherenkov Detector (GRINCH) is a new heavy gas Cherenkov threshold detector developed for the Super Bigbite (SBS) program in Hall A in Jefferson Lab. The purpose of the GRINCH is to distinguish between pions and electrons during electromagnetic form factor experiments. Consisting of 510 1-inch photomultipier tubes and filled with C4F8 heavy gas, this novel detector is designed to run in very high background rates. The GRINCH began commissioning with beam during the GMn experimental run in January 2022. This talk will give an overview of the GRINCH detector, analysis of its performance during the commissioning period using cluster finding methods, and its future in Hall A experiments. |
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