Bulletin of the American Physical Society
Fall 2022 Meeting of the APS Division of Nuclear Physics
Volume 67, Number 17
Thursday–Sunday, October 27–30, 2022; Time Zone: Central Daylight Time, USA; New Orleans, Louisiana
Session MC: Hadronic Physics V |
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Chair: Devi Adhikari, Virginia Tech Room: Hyatt Regency Hotel Celestin A |
Sunday, October 30, 2022 8:30AM - 8:42AM |
MC.00001: A TeV Muon-Ion Collider at BNL - the future QCD frontier and a path toward a new high energy frontier Wei Li, Darin Acosta, Emanuela Barberis, Nicholas Hurley, Darien Wood, Xunwu Zuo, Osvaldo Miguel Colin The development of a TeV-scale muon accelerator and storage ring provides enormous scientific potential not only for a mu+mu- collider, but also for deep inelastic scattering in a completely new regime when a TeV muon beam is collided with a hadron beam. For example, if the approved Electron-Ion Collider at BNL were eventually upgraded with a TeV muon beam replacing its low energy electron ring, a $Q^2$ reach of up to $10^{-6}$ GeV$^2$ is accessible and a parton momentum fraction $x$ down to $1.0\times 10^{-5}$ can be probed. This coverage is equivalent to that of the proposed LHeC, although the facility at BNL offers the additional possibilities of polarized beams to study spin dependencies and a large variety of ion beams. We report on studies of the physics potential at such muon-ion colliders that could be realized at the BNL facility as well as at other sites such as the CERN LHC. In particular, we summarize and contrast the kinematics in such high momentum muon-ion collisions with other collider proposals, and discuss the prospects for electroweak and QCD measurements. The sensitivity to very low values of $x$ will allow a careful study of the expected region of gluon saturation in nuclei. We also examine the potential for Higgs boson studies in muon-proton collisions through calculations of the production cross sections for different beam energies and polarizations, as well as show the kinematic distributions of the decay products and of the scattered lepton and parton. Finally, we discuss some detector design considerations and the needed coverage and resolution for measurements. A common feature for the experiments at such a muon-ion collider facility is the need for a forward muon spectrometer. |
Sunday, October 30, 2022 8:42AM - 8:54AM |
MC.00002: Status of the MUonE experiment: An independent measurement of hadronic vacuum polarization Frederick Gray The anomalous magnetic moment of the muon provides a sensitive test of the completeness of the Standard Model, and recent results from the Fermilab g-2 experiment have added to the evidence of a possible discrepancy. The limiting uncertainty in the theoretical prediction for this quantity arises from the hadronic vacuum polarization (HVP) part, for which data-driven evaluations are in tension with new lattice QCD calculations. The MUonE experiment will independently determine this HVP contribution from the running of the effective electromagnetic coupling α with the squared momentum transfer t, by precisely measuring the shape of the differential cross section for muon-electron elastic scattering. A 160 GeV muon beam at CERN will collide with electrons in a set of carbon or beryllium targets, each instrumented with a silicon strip tracking detector to measure the muon and electron track angles, and an electromagnetic calorimeter will resolve ambiguities in particle identification. This talk will discuss the concept, status, and plans for the experiment. |
Sunday, October 30, 2022 8:54AM - 9:06AM |
MC.00003: Timing Analysis in the MUSE Experiment Wan Lin The MUon proton Scattering Experiment (MUSE) at the PiM1 beam line of the Paul Scherrer Institute is simultaneously measuring the elastic scattering of electrons and muons from a liquid hydrogen target to extract the charge radius of the proton. Both beam polarities will be measured over the course of the experiment. By comparing the four scattering cross sections, the experiment will provide unique muon proton scattering data with a precision sufficient to address the proton radius puzzle, and will directly measure two-photon exchange effects for both muons and electrons. In this talk, I will discuss the recent effort on improving the timing analysis at MUSE experiment. Results from time walk corrections and determination of the beam momenta using RF timing will be shown. |
Sunday, October 30, 2022 9:06AM - 9:18AM |
MC.00004: Overview of the Muon Scattering Experiment at PSI Tanvi Patel The proton radius puzzle arose in 2010 from the disagreement between the proton charge radius as measured with electron scattering and atomic hydrogen spectroscopy, and that measured with a new method using muonic hydrogen. Inspired by this puzzle, the MUon Scattering Experiment (MUSE) at the Paul Scherrer Institute (PSI) in Villigen, Switzerland, was introduced to provide new information by simultaneously measuring elastic scattering of electrons and muons of either charge polarity from a liquid hydrogen target. MUSE aims to provide precise cross sections with form factor and radius extraction, while addressing the issues of two photon exchange and lepton universality. An overview of this experiment and current status will be presented. |
Sunday, October 30, 2022 9:18AM - 9:30AM |
MC.00005: Path Length Reconstruction for MUSE Haley R Reid The Muon Scattering Experiment (MUSE) at the Paul Scherrer Institute aims to measure the elastic scattering of muons and electrons from a liquid hydrogen target. MUSE was motivated by the proton radius puzzle, and the experiment is the first high precision muon scattering radius measurement. MUSE measures with both positively and negatively charged leptons, including muons, electrons, and pions. With the mixed lepton beam, it is important to identify and reconstruct events of different types, with the ultimate goal of having clearly defined scattering events of different types. This presentation will discuss the method and process for reconstruction of incoming and scattered particle paths for MUSE in the effort to identify reactions and extract form factors and radii. |
Sunday, October 30, 2022 9:30AM - 9:42AM Withdrawn |
MC.00006: 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 un- |
Sunday, October 30, 2022 9:42AM - 9:54AM |
MC.00007: First Measurement of the Jet Charge in $\sqrt{s} = 200$ GeV $pp$ Collisions at STAR Grant McNamara The total electrical charge in an isolated system is conserved, so the charge of a parton, i.e. quark or gluon, originating from a high-$Q^{2}$ process within a high-energy proton-proton collision, is conserved throughout the parton shower evolution and hadronization process. Consequently, this should be reflected in the overall charge of a measured jet. In this talk, we present the first measurement of the jet charge at RHIC using data from $\sqrt{s} = 200$ GeV $pp$ collisions at STAR. By performing the measurement differentially in jet transverse momentum, the jet energy dependent fractions of quark- and gluon-initiated jets can be studied. On the other hand, in heavy-ion collisions, hard gluons traversing the quark-gluon plasma are expected to lose more energy via gluon bremsstrahlung than quarks due to the increased color factor. Therefore, this reference measurement can also be used as a baseline for a study of the quark and gluon energy loss in the hot medium. |
Sunday, October 30, 2022 9:54AM - 10:06AM |
MC.00008: Studying Color Transparency through u-Channel π0 Electroproduction off a Nuclear Target Garth M Huber, Wenliang B Li, Bernard Pire, Wim Cosyn The recent measurements of exclusive backward-angle meson electroproduction from Jefferson Lab hint at a new domain of applicability of the QCD collinear factorization framework in the special u-channel kinematics regime. As a signature of QCD degrees of freedom in nuclei, and as a co-requisite of reaching the factorization regime, Color Transparency is expected to manifest itself as an increase in nuclear transparency with increasing momentum transfer. With the most recent quasi-elastic C(e,e'p) data ruling out Color Transparency for this process up to Q2=14.2 GeV2, while π electroproduction data in the forward region indicate CT effects, looking for CT in u-channel kinematics, where a fast nucleon is produced, has became a topic of debate. In this presentation, we present an idea that will attempt to test color transparency using a u-channel π0 electroproduction process: A(e,e'p)π0. |
Sunday, October 30, 2022 10:06AM - 10:18AM |
MC.00009: Study of Color Transparency Phenomenon with Meson Production at Jefferson Lab Lamiaa El Fassi Over the last few decades, several experiments have used atomic nuclei as unique laboratories to probe the internal structure of the strongly interacting particles, namely hadrons. Indeed, the nucleus could be used as a revealing medium of the time evolution of elementary configurations of the hadron wave function. One of the ordinary approaches used to probe this picture involves searching for the onset of various phenomena which are naturally predicted by Quantum Chromo-Dynamics (QCD), the theory of strong interactions. One such phenomenon is the Color Transparency (CT) which refers to the production and propagation of a small size hadron-like configuration that, under specific conditions, stays intact in a transparent nuclear medium. In this talk, I will briefly review the status of the experimental search for CT effects and highlight the upcoming Jefferson Lab experiment that will study CT at higher momentum transfer using the CLAS12 spectrometer. |
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