We present estimates of Single Spin Asymmetry (SSA) in the electroproduction of J/ψ taking into account the transverse momentum dependent (TMD) evolution of the gluon Sivers function and using Color Evaporation Model of charmonium production. We estimate SSA for JLab, HERMES, COMPASS and eRHIC energies using recent parameters for the quark Sivers functions which are fitted using an evolution kernel in which the perturbative part is resummed up to next-to-leading logarithms (NLL) accuracy. We find that these SSAs are much smaller as compared to our first estimates obtained using DGLAP evolution but are comparable to our estimates obtained using TMD evolution where we had used approximate analytical solution of the TMD evolution equation for the purpose.
@article{arxiv.1411.3893,
title = {Single Spin Asymmetry in Charmonium Production},
author = {Rohini M. Godbole and Abhiram Kaushik and Anuradha Misra and Vaibhav S. Rawoot},
journal= {arXiv preprint arXiv:1411.3893},
year = {2015}
}
Comments
Conference proceedings of Light Cone 2014 at Raleigh, NC, USA. Talk presented by Prof. Anuradha Misra. arXiv admin note: text overlap with arXiv:1411.0832