Speaker
Xiang Gao
(Argonne National Lab)
Description
We present a lattice QCD determination of the nucleon generalized parton distributions (GPDs) from an analysis of the quasi-GPD matrix element within the leading-twist framework. We preform our study on a Nf=2+1+1 twisted mass fermions ensemble with a clover improvement. The faster and more effective lattice QCD calculations of GPDs using the asymmetric frames was applied so that we can achieve multiple momentum transfers $t$ with reduced computational cost. The quasi-GPD matrix elements are renormalized using ratio scheme and analyzed using the leading-twist Mellin operator product expansion (OPE) at the next-to-leading order. We find a robust result for the first non-vanishing Mellin moments <x> and <x^2> as a function of $t$.
Primary authors
Andreas Metz
(Physics Department, Temple University, Philadelphia)
Fernanda Steffens
(University of Bonn)
Jack Dodson
(Temple University)
Krzysztof Cichy
Martha Constantinou
(Temple University)
Shohini Bhattacharya
(BNL)
Swagato Mukherjee
(Brookhaven National Laboratory)
Yong Zhao
(ANL)
