Transverse single spin asymmetries in Drell-Yan processes

被引：75
作者：
Anselmino, M
D'Alesio, U
Murgia, F
机构：
[1] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy
[2] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
[3] Ist Nazl Fis Nucl, Sez Cagliari, I-09042 Monserrato, CA, Italy
[4] Univ Cagliari, Dipartimento Fis, I-09042 Monserrato, CA, Italy
来源：
PHYSICAL REVIEW D | 2003年 / 67卷 / 07期
关键词：
D O I：
10.1103/PhysRevD.67.074010
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recently, it has been shown, contrary to previous beliefs, that the k(perpendicular to) distribution of quarks in a transversely polarized proton can be asymmetric. This "Sivers effect" had already been used to explain transverse single spin asymmetry (SSA) observed in inclusive pion production p(up arrow)p-->piX and (p) over bar (up arrow)p-->piX. In such channels, however, other mechanisms, such as the "Collins effect" (a k(perpendicular to) asymmetric fragmentation of a transversely polarized quark into pions), may generate SSA. The Sivers asymmetry is used here to compute the SSA in Drell-Yan processes; in this case, by considering the differential cross section in the lepton-pair invariant mass, rapidity, and transverse momentum, other mechanisms that may originate SSA cannot contribute. Estimates for BNL RHIC experiments are given.
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页数：10
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