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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4]
  1. College of William and Mary, Williamsburg, VA (United States)
  2. Univ. degli Studie di Pavia, Pavia (Italy); INFN Sezione di Pavia, Pavia (Italy)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Johannes Gutenberg Univ., Mainz (Germany)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1416140
Alternate Identifier(s):
OSTI ID: 1414850
Report Number(s):
JLAB-THY-17-2630; DOE/OR/23177-4301; arXiv:1708.05316
Journal ID: ISSN 2470-0010; PRVDAQ; TRN: US1800882
Grant/Contract Number:  
PHY-1516509; AC05-06OR23177; FG02-87ER40365
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Carlson, Carl E., Pasquini, Barbara, Pauk, Vladyslav, and Vanderhaeghen, Marc. Beam normal spin asymmetry for the ep→eΔ(1232) process. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.113010.
Carlson, Carl E., Pasquini, Barbara, Pauk, Vladyslav, & Vanderhaeghen, Marc. Beam normal spin asymmetry for the ep→eΔ(1232) process. United States. doi:10.1103/PhysRevD.96.113010.
Carlson, Carl E., Pasquini, Barbara, Pauk, Vladyslav, and Vanderhaeghen, Marc. Tue . "Beam normal spin asymmetry for the ep→eΔ(1232) process". United States. doi:10.1103/PhysRevD.96.113010. https://www.osti.gov/servlets/purl/1416140.
@article{osti_1416140,
title = {Beam normal spin asymmetry for the ep→eΔ(1232) process},
author = {Carlson, Carl E. and Pasquini, Barbara and Pauk, Vladyslav and Vanderhaeghen, Marc},
abstractNote = {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.},
doi = {10.1103/PhysRevD.96.113010},
journal = {Physical Review D},
number = 11,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 2 works
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Figures / Tables:

Figure-1 Figure-1: The one-photon exchange diagram. The grey blob represents the electromagnetic vertex of the nucleon.

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