Target normal single-spin asymmetry in inclusive electron-nucleon scattering in the 1/Nc expansion

Goity, J.  L.; Weiss, C.; Willemyns, C.

doi:10.1103/physrevd.107.094026

Title: Target normal single-spin asymmetry in inclusive electron-nucleon scattering in the 1 / N c expansion

Journal Article · 22 May 2023 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.107.094026 · OSTI ID:1974656

Goity, J. L. ^[1]; Weiss, C. ^[2];

^[3]

Hampton University, Hampton, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Université de Mons (Belgium)

The target normal single-spin asymmetry in inclusive electron-nucleon scattering is studied in the low-energy regime that includes the Δ resonance. The particular interest in the asymmetry resides in that it is driven by two-photon exchange effects. It probes the spin-dependent absorptive part of the two-photon exchange amplitude, which is free of infrared and collinear singularities and represents the most pristine expression of two-photon exchange dynamics. The study presented here uses the 1/N_c expansion of QCD, which combines the N and Δ through the emergent SU(4) spin-flavor symmetry in the baryon sector and allows for a systematic construction of the transition EM currents. The analysis includes the first subleading corrections in the 1/N_c expansion and presents results for elastic and inelastic final states. The asymmetry is found to be in the range 10^-3 - 10^-2. The Δ resonance plays an important role as an intermediate state in the elastic asymmetry and as a final state in the inclusive asymmetry.

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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); Fonds de la Recherche Scientifique (FNRS)

Grant/Contract Number:: AC05-06OR23177; PHY 1913562; 4.45.10.08

OSTI ID:: 1974656

Alternate ID(s):: OSTI ID: 1974541

Report Number(s):: JLAB-THY-23-3783; DOE/OR/23177-5802; TRN: US2313976

Journal Information:: Physical Review. D., Vol. 107, Issue 9; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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