[Theory-seminars] Theory Seminar, Wednesday, 2PM, Room L102 - Fernanda Steffens

[Alessandro Pilloni]

Dear all, Fernanda Steffens is visiting the Theory Center,
and she kindly accepted to give a seminar before she leaves.

Theory Center Seminar
Wednesday, Nov. 30, 2016
2:00 p.m.
CEBAF Center, Room L102 

Fernanda Steffens (DESY)
Title:   "Direct Calculation of PDFs in Lattice QCD"

Abstract: 
Parton distributions are usually defined as light-cone correlations in the nucleon. Until recently, however, it was not possible to calculate the distributions in lattice QCD because, unlike spatial correlations, one cannot simulate light-cone correlations in a Euclidian lattice. In 2013, Ji proposed a way to circumvent this restriction, through the use of quark quasi-distributions which are defined as purely spatial correlations. Although they are not the physical distributions, the quark quasi-distributions are related to the quark distributions through a perturbative calculation. Within this procedure, a direct calculation of the distributions in lattice QCD became a possibility, and we present here a high statistics analysis of the x-dependence of the bare unpolarized, helicity and transversity iso-vector parton distribution functions (PDFs) from lattice calculations employing (maximally) twist
ed mass fermions. The x-dependence of the calculated PDFs resembles those of the phenomenological parameterizations, a feature that makes this approach promising despite the lack of a full renormalization program for them.

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