Spin asymmetries for vector boson production in polarized p plus p collisions

被引：16

作者：

Huang, Jin ^{[1
]}

Kang, Zhong-Bo ^{[2
]}

Vitev, Ivan ^{[2
]}

Xing, Hongxi ^{[2
]}

机构：

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

[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW D | 2016年 / 93卷 / 01期

关键词：

SINGLE-SPIN; DRELL-YAN; PARTON DISTRIBUTIONS; STATE INTERACTIONS; HARD-SCATTERING; QCD CORRECTIONS;

D O I：

10.1103/PhysRevD.93.014036

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the cross section for vector boson (W-+/-/Z(0)/gamma*) production in polarized nucleon-nucleon collisions for low transverse momentum of the observed vector boson. For the case where one measures the transverse momentum and azimuthal angle of the vector bosons, we present the cross sections and the associated spin asymmetries in terms of transverse momentum dependent parton distribution functions (TMDs) at tree level within the TMD factorization formalism. To assess the feasibility of experimental measurements, we estimate the spin asymmetries for W-+/-/Z(0) boson production in polarized proton-proton collisions at the Relativistic Heavy Ion Collider by using current knowledge of the relevant TMDs. We find that some of these asymmetries can be sizable if the suppression effect from TMD evolution is not too strong. The W program at RHIC can, thus, test and constrain spin theory by providing unique information on the universality properties of TMDs, TMD evolution, and the nucleon structure. For example, the single transverse spin asymmetries could be used to probe the well-known Sivers function f(1T)(perpendicular to q), as well as the transversal helicity distribution g(1T)(q) via the parity-violating nature of W production.

引用

页数：13

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