J / ψ production in polarized and unpolarized ep collision and Sivers and cos 2 ϕ asymmetries

We calculate the Sivers and cos2ϕ azimuthal asymmetries in J/ψ production in the polarized and unpolarized semi-inclusive ep collision, respectively, using the formalism based on the transverse momentum-dependent parton distributions (TMDs). The non-relativistic QCD-based color octet model is employ...

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Bibliographic Details
Published inThe European physical journal. C, Particles and fields Vol. 77; no. 12; pp. 1 - 14
Main Authors Mukherjee, Asmita, Sangem Rajesh
Format Journal Article
LanguageEnglish
Published Heidelberg Springer Nature B.V 01.12.2017
Subjects
Asymmetry
Collision dynamics
Skewed distributions
Transverse momentum
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Summary:We calculate the Sivers and cos2ϕ azimuthal asymmetries in J/ψ production in the polarized and unpolarized semi-inclusive ep collision, respectively, using the formalism based on the transverse momentum-dependent parton distributions (TMDs). The non-relativistic QCD-based color octet model is employed in calculating the J/ψ production rate. The Sivers asymmetry in this process directly probes the gluon Sivers function. The estimated Sivers asymmetry at z=1 is negative, which is in good agreement with the COMPASS data. The effect of TMD evolution on the Sivers asymmetry is also investigated. The cos2ϕ asymmetry is sizable and probes the linearly polarized gluon distribution in an unpolarized proton.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-017-5406-4