Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session 1WEA: Exploring Excited Nucleons with Meson, Electron, and Photon Beams IInvited Workshop
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Chair: Philip Cole, Lamar University Room: Hilton Waikoloa Village Queens 4 |
Sunday, November 26, 2023 9:00AM - 9:30AM |
1WEA.00001: Exposing Emergent Hadron Mass in the Structure of Excited Nucleons Invited Speaker: Craig D Roberts Higgs boson couplings into QCD produce only a very small part of a baryon's mass and play little role in determining its structure. Such features are principally expressions of nonperturbative dynamics within the strong interaction sector of the Standard Model. The past decade has revealed the three pillars of this emergent hadron mass (EHM); namely, a nonzero gluon mass-scale, a process-independent effective charge, and dressed-quarks with constituent-like masses. Contemporary theory is now exposing their manifold expressions in hadron observables and highlighting the types of measurements that can be made in order to validate the EHM paradigm. In sketching such developments, this presentation will highlight the role of EHM in forming baryon spectra and structure. |
Sunday, November 26, 2023 9:30AM - 10:00AM |
1WEA.00002: Compositeness of hadrons and its application to baryon resonances Invited Speaker: Tetsuo Hyodo In this talk, we discuss the nature of excited baryons from the viewpoint of compositeness. Compositeness is a quantitative measure of the internal structure of hadrons, originally introduced to demonstrate the composite nature of the deuteron [1,2]. In particular, the compositeness of the near-threshold states can be model-independently determined by the experimental observables [1,3,4]. Inspired by recent findings of exotic hadrons, there has been a renewed interest in compositeness within hadron spectroscopy. For such applications, it is important to characterize the compositeness of an unstable resonance, which is described by the pole of the scattering amplitude [3]. We show a couple of applications of compositeness to baryon resonances in the strangeness S=-1 [5] and S=0 [6] sectors and present future prospects in relation to experiments. |
Sunday, November 26, 2023 10:00AM - 10:30AM |
1WEA.00003: Studies of Nucleon Resonance Electroexcitations Invited Speaker: Patrick Achenbach Nucleons are the most fundamental three-body systems in Nature. During the last decade crucial progress has been achieved in the exploration of the spectrum and the structure of nucleon resonances. Studies of exclusive πN, π+π−p, KΛ, and KΣ electroproduction off protons on the evolution of the electrocouplings with photon virtuality Q2 using the CLAS spectrometer has revealed a complex interplay between an inner core of three dressed quarks surrounded by an external meson-baryon cloud. CLAS12 is the only facility capable of extending these results on the electrocouplings into the unexplored Q2 range, spanning the domain of quark momenta where ≈ 50% of hadron mass is generated. The increase of the CEBAF energy and the upgrade of the CLAS12 spectrometer to measure exclusive electroproduction channels at higher luminosity and photon virtualities will offer a unique opportunity to explore how the dominant part of hadron mass and the bound three-quark structure of the resonant states emerge from QCD. |
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