Beam normal spin asymmetry for the 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:
-
- 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)
- 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)
- 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. https://doi.org/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. https://doi.org/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 = {Tue Dec 26 00:00:00 EST 2017},
month = {Tue Dec 26 00:00:00 EST 2017}
}
Web of Science
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