production in polarized and unpolarized ep collision and Sivers and [Formula omitted] asymmetries

We calculate the Sivers and [Formula omitted] azimuthal asymmetries in [Formula omitted] 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 c...

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Bibliographic Details
Published inThe European physical journal. C, Particles and fields Vol. 77; no. 12
Main Authors Mukherjee, Asmita, Rajesh, Sangem
Format Journal Article
LanguageEnglish
Published Springer 11.12.2017
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Summary:We calculate the Sivers and [Formula omitted] azimuthal asymmetries in [Formula omitted] 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 [Formula omitted] production rate. The Sivers asymmetry in this process directly probes the gluon Sivers function. The estimated Sivers asymmetry at [Formula omitted] is negative, which is in good agreement with the COMPASS data. The effect of TMD evolution on the Sivers asymmetry is also investigated. The [Formula omitted] 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