Constraints on the gluon Sivers distribution via transverse single spin asymmetries at midrapidity in p↑p→π0X processes at BNL RHIC

被引：46

作者：

Anselmino, M. ^{[1
]}

D'Alesio, U.

Melis, S.

Murgia, F.

机构：

[1] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy

[2] Ist Nazl Fis Nucl, Sezione Torino, I-10125 Turin, Italy

[3] Univ Cagliari, Dipartimento Fis, I-09042 Monserrato, CA, Italy

[4] Ist Nazl Fis Nucl, Sezion Cagliari, I-09042 Monserrato, CA, Italy

来源：

PHYSICAL REVIEW D | 2006年 / 74卷 / 09期

关键词：

D O I：

10.1103/PhysRevD.74.094011

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider the recent RHIC data on the transverse single spin asymmetry (SSA) A(N), measured in p(up arrow)p ->pi X-0 processes at midrapidity by the PHENIX Collaboration. The measurement is consistent with a vanishing SSA. We analyze this experimental information within a hard scattering approach based on a generalized QCD factorization scheme, with unintegrated, transverse momentum dependent (TMD), parton distribution and fragmentation functions. It turns out that, in the kinematical region of the data, only the gluon Sivers effect could give a large contribution to A(N); its vanishing value is thus an indication about the possible size of the gluon Sivers function (GSF). Approximate upper limits on its magnitude are derived. Additional constraints obtained combining available parameterizations of the quark Sivers function and the Burkardt sum rule (BSR) for the Sivers distributions are also discussed.

引用

页数：7

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