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.

引用

页数：4

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