We evaluate the light-cone operator product expansion for the unpolarized transverse momentum dependent (TMD) operator in the background-field technique up twist-3 inclusively. The next-to-leading order (NLO) matching coefficient for the Sivers function is derived. The method, as well as many details of the calculation, are presented.
@article{arxiv.1901.04519,
title = {Collinear matching for Sivers function at next-to-leading order},
author = {Ignazio Scimemi and Andrey Tarasov and Alexey Vladimirov},
journal= {arXiv preprint arXiv:1901.04519},
year = {2019}
}
Comments
46 page, 8 figured; ver2: Updated discussions on rapidity divergences and scheme-dependance, many minor changes