QCD angular momentum in N → Δ transitions

Kim, June-Young; Won, Ho-Yeon; Goity, Jose L.; Weiss, Christian

doi:10.1016/j.physletb.2023.138083

Title: QCD angular momentum in N → Δ transitions

Journal Article · Fri Sep 01 00:00:00 EDT 2023 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2023.138083· OSTI ID:1993114

Kim, June-Young; Won, Ho-Yeon; Goity, Jose L.; Weiss, Christian

N → Δ transitions offer new possibilities for exploring the isovector component of the QCD quark angular momentum (AM) operator causing the $$J^{u - d}$$ flavor asymmetry in the nucleon. We extend the concept of QCD AM to transitions between baryon states, using light-front densities of the energy-momentum tensor in transversely localized states. We calculate the N → Δ transition AM in the 1/N_c expansion, connect it with the $$J^{u - d}$$ flavor asymmetry in the nucleon, and estimate the values using lattice QCD results. In the same setup we connect the transition AM to the transition GPDs sampled in hard exclusive electroproduction processes with N → Δ transitions, enabling experimental study of the transition AM.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Ministry of Education, Science and Technology, Korea (MEST)

Grant/Contract Number:: AC05-06OR23177; PHY 1913562; 2021R1A2C2093368; 2018R1A5A1025563

OSTI ID:: 1993114

Alternate ID(s):: OSTI ID: 1990015

Report Number(s):: JLAB-THY-23-3795; arXiv:2304.08575; DOE/OR/23177-6037; S0370269323004173; 138083; PII: S0370269323004173

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 844 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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