Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session QG: Mini-Symposium: Hadronic Spectroscopy II |
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Chair: Jonathan Zarling, Jlab Room: Copley & Kenmore |
Thursday, October 14, 2021 11:30AM - 11:42AM |
QG.00001: Search for intermediate cascade Ξ state in the reaction ep→ e'K+K+K-(Λ/∑) using CLAS12 Achyut Khanal, Lei Guo, Brian Raue The CLAS12 very strange physics program aims to study the electroproduction of doubly strange cascade hyperons. Which are experimentally underexplored. The reaction ep→ e'K+K+K-(Λ/∑) is being investigated with an electron-beam energy of 10.6 GeV using CLAS12 data. We detect scattered electrons with either the forward detector, covering a polar angle range of 5ο to 35ο to study electroproduction, or with the forward tagger covering a polar angle range of 2.5ο to 4.5ο to study quasi-real photoproduction. Charged kaons are detected with the CLAS12 detector, which covers a solid angle of nearly 4π. Λ/∑ hyperons can be reconstructed using the missing mass technique to explore intermediate double strange hyperons which decays to K- and Λ/∑. In this talk, basic data features and preliminary mass spectra from the study will be presented. |
Thursday, October 14, 2021 11:42AM - 11:54AM |
QG.00002: Photoproduction Cross Sections of Baryon—Antibaryon Pairs at GlueX. HAO LI, Reinhard A Schumacher The reaction mechanisms contributing to baryon—antibaryon photoproduction have not been clearly delineated in the past, in part because almost no data existed before now. At GlueX, total cross-sections and differential cross-sections of the reactions γp→BB̅p (where BB̅ includes p-p̅ and Λ-Λ̅) have been obtained from the reaction thresholds up to a beam photon energy of 11.4 GeV. The data encompass 30 million events from the GlueX Phase-I period (2017 - 2018). Phenomenological Monte Carlo models with physical interpretations have been developed to understand various aspects observed in the data, including the angular distributions of the final state particles and various invariant mass distributions of particle pairs. These include single-Regge mechanisms modeled by a single well-defined t-channel slope and a clustering parameter for the created baryon pairs. In addition, the data strongly suggest double-Regge mechanisms that involve different slopes. Preliminary cross sections results will be presented, including similarities and the differences seen when creating neutral versus charged or strange versus non-strange baryons using photoproduction. |
Thursday, October 14, 2021 11:54AM - 12:06PM |
QG.00003: Survey of the Reaction γp → p π+ π- π0 η Edmundo S Barriga The GlueX experiment has produced the world’s largest statistics for peripheral photoproduction of mesons with a goal to unambiguously identify new and exotic mesons. Here we will present preliminary results on the search for possible intermediate resonances which decay to ωη; such as the known ω(1650), the exotics JPC= 0--,2+-, and the elusive JPC= 2+-. The ω, in this reaction, is identified via the π+ π- π0 decay mode and the η and π0 are identified via the decay to 2γ. 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 around 9.0 GeV incident on a liquid hydrogen target. General features of the data will be presented along with plans for future studies. |
Thursday, October 14, 2021 12:06PM - 12:18PM |
QG.00004: Studying the nature of the $P_c(4312)^+$ pentaquark state using Artificial Neural Networks Lawrence Ng Pentaquark candidates have been seen by LHCb in the $J/\psi$p spectrum. One such candidate is the narrow $P_c(4312)^+$ state whose lineshape might be due to the opening of the $\Sigma^+_c\bar{D}^0$ threshold approximately 5 MeV higher. A recent analysis by the Joint Physics Analysis Center, JPAC, has suggested that the $P_c(4312)^+$ is likely to be a virtual state. |
Thursday, October 14, 2021 12:18PM - 12:30PM |
QG.00005: Status of the search for exotic hybrid mesons in π0η and π0η' systems at GlueX Zachary A Baldwin For several decades, various experiments have studied the spectrum of hadrons. Motivated by Lattice Quantum Chromodynamics (LQCD), “gluonic excitations” would entail several states with quantum numbers not permitted by the constituent quark model. Discovering these proposed exotic hybrid mesons with forbidden JPC values would provide evidence for non quark-antiquark states. The search for exotic hybrid mesons at the GlueX experiment has completed the initial phase of data collection during 2018; large data samples with acceptance for all final states are currently being studied. An emphasis has been placed on the lightest exotic state with JPC = 1-+ predicted by LQCD. Strong interest has been placed on both the π0η and π0η' systems due to compelling evidence for exotic quantum numbers in the past. Preliminary results will be shown for γp→π0η(')→4γπ+π-p utilizing all of the GlueX Phase-1 data as well as a comparison to previous experimental (COMPASS) and theoretical (JPAC) results of the same channels. |
Thursday, October 14, 2021 12:30PM - 12:42PM |
QG.00006: Progress in relativistic three-hadron scattering from lattice QCD Andrew W Jackura Lattice QCD offers a systematic pathway to numerically compute the resonant hadronic spectrum from first principles. A set of integral equations connects the short-distance dynamics computed from lattice QCD to on-shell infinite-volume scattering amplitudes. In this talk, I will discuss recent progress in determining three-hadron scattering amplitudes from lattice QCD, focusing on constructing scattering relations from unitarity and our recent study on numerical solutions of the integral equations. |
Thursday, October 14, 2021 12:42PM - 12:54PM |
QG.00007: Bound states in the three-body scattering formalisms Sebastian M Dawid, Raul A Briceno, Adam P Szczepaniak, Andrew W Jackura, Md Habib E Islam, Connor McCarty Strong interactions produce a rich spectrum of resonances which decay into three or more hadrons. Understanding their phenomenology requires a theoretical framework to extract parameters from experimental data and lattice QCD simulations of hadron scattering. Two classes of relativistic three-body approaches are currently being pursued: the EFT-based and unitarity-based one. We consider a model of relativistic three-body scattering with an S-wave bound state in the two-body sub-channel using both formalisms. We present and discuss numerical solutions for the multi-hadron scattering amplitudes in different kinematical regions, obtained from integral equations of the EFT-based approach. We also show how to generalize the unitarity-based framework to include all relevant open channels, discuss the nonphysical singularities near the physical region, and propose how to eliminate them. |
Thursday, October 14, 2021 12:54PM - 1:06PM |
QG.00008: Search for Excited Ξ* States Brandon Christopher L Sumner Constituent quark models and lattice calculations often predict many more states than have |
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