Speaker
Artur Avkhadiev
Description
This work presents a determination of the quark Collins-Soper kernel from quasi-TMDs using lattice QCD and LaMET. The kernel is extracted in the range of transverse momentum scales $240\,\mathrm{MeV} <q_T< 1.6\,\mathrm{GeV}$ for hadron momenta $P < 2.2\,\mathrm{GeV}$, using quark masses corresponding to a close-to-physical value of the pion mass. An analysis of LaMET matching, including for the first time next-to-next leading order accuracy and next-to-next leading logarithmic resummations, indicates perturbative convergence for $q_T \lesssim 550\,\mathrm{MeV}$ and increasing sensitivity to the associated power corrections in $q_T$ at larger transverse momenta.
