期刊
PHYSICAL REVIEW D
卷 96, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.113010
关键词
-
资金
- National Science Foundation (USA) [PHY-1516509]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC05-06OR23177, DE-FG0287ER40365]
We calculate the single spin asymmetry for the ep -> 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 a two-photon exchange process is on its mass shell, the asymmetry allows one to access for the first time the on-shell Delta -> Delta as well as N* -> Delta electromagnetic transitions. We present the general formalism to describe the ep -> e Delta beam normal spin asymmetry, and we 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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