Photoproduction of a πρT pair with a large invariant mass and transversity generalized parton distribution

被引：39
|
作者：
El Beiyad, M. [1 ,2 ]
Pire, B. [2 ]
Segond, M. [3 ]
Szymanowski, L. [2 ,4 ]
Wallon, S. [1 ,5 ]
机构：
[1] Univ Orsay, CNRS, LPT, F-91404 Orsay, France
[2] Ecole Polytech, CNRS, Ctr Phys Theor, F-91128 Palaiseau, France
[3] Univ Leipzig, Inst Theoret Phys, D-04009 Leipzig, Germany
[4] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland
[5] Univ Paris 06, Fac Phys, UPMC, F-75252 Paris 05, France
来源：
PHYSICS LETTERS B | 2010年 / 688卷 / 2-3期
关键词：
Transversity; Exclusive reactions; Generalized parton distributions; Quantum chromodynamics; ELECTROPRODUCTION; POLARIZATION; SCATTERING; DENSITIES; QUARKS;
D O I：
10.1016/j.physletb.2010.02.086
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The chiral-odd transversity generalized parton distributions (GPDs) of the nucleon can be accessed experimentally through the exclusive photoproduction process gamma + N -> pi + rho + N', in the kinematics where the meson pair has a large invariant mass and the final nucleon has a small transverse momentum, provided the vector meson is produced in a transversally polarized state. We calculate perturbatively the scattering amplitude at leading order in alpha(s). We build a simple model for the dominant transversity GPD H-T(x, xi, t) based on the concept of double distribution. We estimate the unpolarized differential cross section for this process in the kinematics of the Jlab and Compass experiments. Counting rates show that the experiment looks feasible with the real photon beam characteristics expected at JLab@12 GeV, and with the quasi real photon beam in the Compass experiment. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：154 / 167
页数：14
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