Finite continuum quasi distributions from lattice QCD

¹ Institute for Nuclear Theory, University of Washington, Seattle, WA 98195-1550, USA
² New High Energy Theory Center and Department of Physics and Astronomy, Rutgers, the State University of New Jersey, 136 Frelinghuysen Road, Piscataway, New Jersey 08854-8019, USA
³ Physics Department, College of William and Mary, Williamsburg, Virginia 23187, USA
⁴ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA

^* Speaker, e-mail: cjm373@uw.edu

Published online: 26 March 2018

Abstract

We present a new approach to extracting continuum quasi distributions from lattice QCD. Quasi distributions are defined by matrix elements of a Wilson-line operator extended in a spatial direction, evaluated between nucleon states at finite momentum. We propose smearing this extended operator with the gradient flow to render the corresponding matrix elements finite in the continuum limit. This procedure provides a nonperturbative method to remove the power-divergence associated with the Wilson line and the resulting matrix elements can be directly matched to light-front distributions via perturbation theory.