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- Title
$$J/\psi $$ production in polarized and unpolarized ep collision and Sivers and $$\cos 2\phi $$ asymmetries.
- Authors
Mukherjee, Asmita; Rajesh, Sangem
- Abstract
We calculate the Sivers and $$\cos 2\phi $$ azimuthal asymmetries in $$J/\psi $$ 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 $$J/\psi $$ 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 $$\cos 2\phi $$ asymmetry is sizable and probes the linearly polarized gluon distribution in an unpolarized proton.
- Subjects
PAIR production; COLLISIONS (Nuclear physics); ASYMMETRY (Chemistry); QUANTUM chromodynamics; OCTET rule
- Publication
European Physical Journal C -- Particles & Fields, 2017, Vol 77, Issue 12, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-017-5406-4