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 PC: Hadronic Physics VI |
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Chair: Ramona Vogt, LLNL/UC Davis Room: Hyatt Regency Hotel Celestin A |
Sunday, October 30, 2022 10:30AM - 10:42AM |
PC.00001: Measurements of Deeply Virtual Exclusive ρ0 Production with CLAS12 Nicholaus L Trotta
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Sunday, October 30, 2022 10:42AM - 10:54AM |
PC.00002: Beam Asymmetry for Photoproduced ω Mesons Off Bound Protons in Deuterons Utsav Shrestha, Olga Cortes Becerra We extracted quasi-free γ d→ω p(n) photon beam asymmetry polarization observable from the photoproduction of ω mesons off the bound proton inside deuterium using a linearly polarized photon beam. The ω meson was identified through its charged decay ω→π+ π- π0 where the π0 subsequently decays in two photons. The data were taken during the E06-103 (g13) experiment with the CLAS detector in Hall B at the Thomas Jefferson National Accelerator Laboratory (JLab). This decay of N* resonances to ω from photoproduction off a proton is of great interest as ω is an isospin filter. The ωN states can only be produced from N* states with isospin I = 1/2 and not by Δ* states with isospin I = 3/2. Furthermore, since its threshold is above the π and η photoproduction thresholds, the ω meson channel can give information on higher mass resonances (i.e., the region where the proton spectrum is less understood). |
Sunday, October 30, 2022 10:54AM - 11:06AM |
PC.00003: Study of the Reaction γp→η'ηp Jason Barlow The motivation behind the GlueX experiment is to search for hybrid mesons. There is evidence for an exotic isovector π1(1600) which has been observed decaying to ηπ and η'π. The π1(1600) should have an isoscalar partner, the η1, that can be observed in the η'η system, and a candidate for this state was recently reported by the BESIII collaboration1. The preliminary analysis presented here considers photoproduction of the final state η'η which decays to 4γπ+π-. The experiment uses a beam of linearly polarized photons with a peak near 9 GeV incident on a hydrogen target that produces these particles. General features of the data including mass spectra and data selection with a focus on removing backgrounds due to photon combinatorics will be shown. |
Sunday, October 30, 2022 11:06AM - 11:18AM |
PC.00004: Resonances in the ωη System at GlueX Edmundo S Barriga The GlueX experiment has produced the world's largest data sample for peripheral photoproduction of mesons with a goal to expand our understanding of the strong interaction and search for hybrid mesons. The data set was obtained at the Thomas Jefferson National Accelerator Facility utilizing the GlueX detector and a tagged linearly polarized photon beam that peaks between 8 - 9 GeV incident on a liquid hydrogen target. We will present the current status of the search for possible intermediate resonances which decay to ωη, such as the known ω(1650) or states with exotic quantum numbers JPC= 0--, 2+-. The ω, in this reaction, is identified via the π+ π- πo decay mode and the η and πo are identified via the decay to 2γ. We demonstrate the amplitude analysis on generated Monte Carlo data and outline our strategy for future studies. |
Sunday, October 30, 2022 11:18AM - 11:30AM |
PC.00005: Glueball Molecules Alexey A Petrov Experimental searches for pure glueball states have proven challenging and so far yielded no results. This is believed to occur because glueballs mix with the ordinary qq-bar states with the same quantum numbers. We will discuss an alternative mechanism, the formation of the glueball-meson molecular states. We will argue that the wave functions of already observed excited meson states may contain a significant part due to such molecular states. We discuss the phenomenology of glueball molecules and comment on a possible charmless component of the XYZ states. |
Sunday, October 30, 2022 11:30AM - 11:42AM |
PC.00006: The decay of the b1(1235)-neutral meson through the ωπ0 channel at GlueX Karthik Suresh, Zisis Papandreou, Justin R Stevens A long-standing goal of hadron physics has been to understand how the quark and gluon degrees of freedom that are present in the fundamental QCD Lagrangian manifest themselves in the spectrum of hadrons. |
Sunday, October 30, 2022 11:42AM - 11:54AM |
PC.00007: Nuclear Modification of J/Psi Production in Fermilab E906 'SeaQuest' Data Noah B Wuerfel It is now well known that the parton distributions of free nucleons and those bound in nuclei are significantly different, having measurable consequences in scattering experiments involving nuclear media. The Fermilab E906, "SeaQuest", experiment took data with a proton beam on hydrogen, deuterium, and various nuclear targets from 2014 to 2017. SeaQuest recently published Drell-Yan dimuon data from the proton and deuterium targets, measuring the ratio of anti-up and anti-down quarks in the parton sea. In addition, the SeaQuest spectrometer measured many dimuons from charmonium production. In this talk, I will present results on the nuclear modification of J/ψ and ψ' production in SeaQuest data. These data will provide insight into the interactions of hadronic final states with cold nuclear matter, which also has implications for the study of quarkonium jets, and complements earlier data from experiments at CERN and Fermilab. |
Sunday, October 30, 2022 11:54AM - 12:06PM |
PC.00008: Di-hadron correlations in $e^-$A DIS with CLAS abstract Sebouh J Paul We present a measurement of the nuclear dependence of di-hadron production in deep inelastic scattering off nuclei using the CLAS detector at Jefferson Lab. We report the first measurement of azimuthal and rapidity correlations in nuclear DIS, which shows a strong suppression for back-to-back pion pairs in nuclei, whereas we observe an enhancement for such pairs where the azimuthal and rapidity separations are both small. This represents a new type of study in electron-nucleus collisions and serves as a pathfinder for future experiments with CLAS12 and the Electron-Ion Collider. |
Sunday, October 30, 2022 12:06PM - 12:18PM |
PC.00009: Extracting neutron polarization observables using the CLAS start counter Mihai Mocanu, Mikhail Bashkanov, Daniel Watts, William D Booth The existence of hexaquark states has far-reaching consequences, such as our understanding of quark structure, and the mechanisms involved inside neutron stars[1]. Predicted in 1964[2], and recently discovered, the simplest non-trivial hexaquark, is the d*(2380), an “excited deuteron” state. The deuteron, comprised of a proton and neutron, can be excited to this state during deuteron photo-disintigration reactions with high photon energies (Eγ ~500-600 MeV). Several other bound/quasibound N-N* dibaryonic states can also be studied in this reaction. However, the world dataset of deuteron photo-disintegration has significant gaps in terms of photon energy coverage, angular coverage, and particularly in measurements of polarization observables. To address this problem, we have utilized experimental data from the CEBAF large acceptance spectrometer (CLAS) in a unique way. |
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