Calculation of Transverse-Momentum-Dependent Evolution for Sivers Transverse Single Spin Asymmetry Measurements

被引：81
|
作者：
Aybat, S. Mert [1 ]
Prokudin, Alexei [2 ]
Rogers, Ted C. [3 ]
机构：
[1] Nikhef Theory Grp, NL-1098 XG Amsterdam, Netherlands
[2] Jefferson Lab, Newport News, VA 23606 USA
[3] SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 24期
基金：
美国国家科学基金会;
关键词：
SCATTERING; DIS;
D O I：
10.1103/PhysRevLett.108.242003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The Sivers transverse single spin asymmetry (TSSA) is calculated and compared at different scales using the transverse-momentum-dependent (TMD) evolution equations applied to previously existing extractions. We apply the Collins-Soper-Sterman (CSS) formalism, using the version recently developed by Collins. Our calculations rely on the universality properties of TMD functions that follow from the TMD-factorization theorem. Accordingly, the nonperturbative input is fixed by earlier experimental measurements, including both polarized semi-inclusive deep inelastic scattering (SIDIS) and unpolarized Drell-Yan (DY) scattering. It is shown that recent preliminary COMPASS measurements are consistent with the suppression prescribed by TMD evolution.
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页数：4
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