Evidence for Polarization of Gluons in the Proton

被引：234

作者：

de Florian, Daniel ^{[1
,2
]}

Sassot, Rodolfo ^{[1
,2
]}

Stratmann, Marco ^{[3
,4
]}

Vogelsang, Werner ^{[3
]}

机构：

[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, RA-1428 Buenos Aires, DF, Argentina

[2] Univ Buenos Aires, Fac Ciencias Exactas & Nat, IFIBA, RA-1428 Buenos Aires, DF, Argentina

[3] Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany

[4] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 01期

关键词：

PARTON DISTRIBUTIONS; SCATTERING;

D O I：

10.1103/PhysRevLett.113.012001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We discuss the impact of recent high-statistics Relativistic Heavy Ion Collider data on the determination of the gluon polarization in the proton in the context of a global QCD analysis of polarized parton distributions. We find evidence for a nonvanishing polarization of gluons in the region of momentum fraction and at the scales mostly probed by the data. Although information from low momentum fractions is presently lacking, this finding is suggestive of a significant contribution of gluon spin to the proton spin, thereby limiting the amount of orbital angular momentum required to balance the proton spin budget.

引用

页数：5

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