Beam normal spin asymmetry for the ep→eΔ(1232) process

Carlson, Carl E.; Pasquini, Barbara; Pauk, Vladyslav; Vanderhaeghen, Marc

doi:10.1103/PhysRevD.96.113010

Title: Beam normal spin asymmetry for the $e p \to e Δ (1232)$ process

Journal Article · Tue Dec 26 00:00:00 EST 2017 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.96.113010· OSTI ID:1416140

Carlson, Carl E. ^[1]; Pasquini, Barbara ^[2]; Pauk, Vladyslav ^[3]; Vanderhaeghen, Marc ^[4]

College of William and Mary, Williamsburg, VA (United States)
Univ. degli Studie di Pavia, Pavia (Italy); INFN Sezione di Pavia, Pavia (Italy)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Johannes Gutenberg Univ., Mainz (Germany)

Here, we calculate the single spin asymmetry for the $$e p \to e \Delta(1232)$$ process, for an electron beam polarized normal to the scattering plane. Such single spin asymmetries vanish in the one-photon exchange approximation, and are directly proportional to the absorptive part of a two-photon exchange amplitude. As the intermediate state in such two-photon exchange process is on its mass shell, the asymmetry allows one to access for the first time the on-shell $$\Delta \to \Delta$$ as well as $$N^\ast \to \Delta$$ electromagnetic transitions. We present the general formalism to describe the $$e p \to e \Delta$$ beam normal spin asymmetry, and provide a numerical estimate of its value using the nucleon, $$\Delta(1232)$$, $$S_{11}(1535)$$, and $$D_{13}(1520)$$ intermediate states. We compare our results with the first data from the Qweak@JLab experiment and give predictions for the A4@MAMI experiment.

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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)

Grant/Contract Number:: PHY-1516509; AC05-06OR23177; FG02-87ER40365

OSTI ID:: 1416140

Alternate ID(s):: OSTI ID: 1414850

Report Number(s):: JLAB-THY-17-2630; DOE/OR/23177-4301; arXiv:1708.05316; PRVDAQ; TRN: US1800882

Journal Information:: Physical Review D, Vol. 96, Issue 11; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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