Single Spin Asymmetries from a Single Wilson Loop

被引:52
作者
Boer, Daniel [1 ]
Echevarria, Miguel G. [2 ,3 ]
Mulders, Piet J. [2 ,3 ]
Zhou, Jian [2 ,3 ,4 ,5 ]
机构
[1] Univ Groningen, Van Swinderen Inst Particle Phys & Grav, Nijenborgh 4, NL-9747 AG Groningen, Netherlands
[2] Nikhef, De Boelelaan 1081, NL-1081 HV Amsterdam, Netherlands
[3] Vrije Univ Amsterdam, Dept Phys & Astron, De Boelelaan 1081, NL-1081 HV Amsterdam, Netherlands
[4] Shandong Univ, Sch Phys, Jinan 250100, Shandong, Peoples R China
[5] Shandong Univ, Key Lab Particle Phys & Particle Irradiat MOE, Jinan 250100, Shandong, Peoples R China
关键词
ANALYZING POWER; ODDERON;
D O I
10.1103/PhysRevLett.116.122001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study the leading-power gluon transverse-momentum-dependent distributions (TMDs) of relevance to the study of asymmetries in the scattering off transversely polarized hadrons. Next-to-leading-order perturbative calculations of these TMDs show that at large transverse momentum they have common dynamical origins but that in the limit of a small longitudinal momentum fraction x, only one origin remains. We find that in this limit, only the dipole-type gluon TMDs survive and become identical to each other. At small x, they are all given by the expectation value of a single Wilson loop inside the transversely polarized hadron, the so-called spin-dependent odderon. This universal origin of transverse spin asymmetries at small x is of importance to current and future experimental studies, paving the way to a better understanding of the role of gluons in the three-dimensional structure of spin-polarized protons.
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页数:6
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