High Energy / Nuclear Theory / RIKEN Seminars

[NT/RBRC seminar] Single Transverse-Spin Asymmetry and Sivers Function on Lattice

by Dr Feng Yuan (Lawrence Berkeley National Lab)




This is not a lattice talk. Instead, I will present our recent development on how to formulate the quark Sivers function on Lattice based on the so-called large momentum effective theory. In particular, we argue the spin asymmetry defined as the ratio of the quark Sivers function over the spin averaged distribution can be directly calculated in terms of the relevant quasi distributions with the soft functions and perturbative matching kernels cancelling out. We will give explicit results at one-loop order, which reduces to a collinear expansion at twist-three level. This may lead to an alternative way to simulate the quark-gluon-quark correlation function (twist-3 distribution) on lattice. Reference: 2011.13397 [hep-ph]