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

被引：17
|
作者：
Carlson, Carl E. [1 ]
Pasquini, Barbara [2 ,3 ]
Pauk, Vladyslav [4 ]
Vanderhaeghen, Marc [5 ,6 ]
机构：
[1] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA
[2] Univ Pavia, Dipartimento Fis, I-27100 Pavia, Italy
[3] INFN, Sez Pavia, I-27100 Pavia, Italy
[4] Jefferson Lab, Newport News, VA 23606 USA
[5] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany
[6] Johannes Gutenberg Univ Mainz, PRISMA Cluster Excellence, D-55099 Mainz, Germany
来源：
PHYSICAL REVIEW D | 2017年 / 96卷 / 11期
基金：
美国国家科学基金会;
关键词：
MAGNETIC DIPOLE-MOMENT; ELECTROMAGNETIC-EXCITATION; FORM-FACTORS; DELTA(+)(1232); SCATTERING; NUCLEON; PHOTOPRODUCTION; PROTONS;
D O I：
10.1103/PhysRevD.96.113010
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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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页数：19
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