XXVIII International Workshop on Deep Inelastic Scattering and Related Subjects

Nucleon valence quark distributions from Lattice QCD using distillation

24 Mar 2020, 11:15

15m

Brooklyn, NY

Contributed Talk Structure Functions and Parton Densities Structure function and parton densities

Speaker

Dr Christos Kallidonis (William & Mary)

Description

We present results on the nucleon valence quark distribution extracted from Lattice QCD simulations, using a gauge ensemble of $N_f=2+1$ Wilson-Clover fermions with a pion mass of $m_{\pi }=350$ MeV and lattice spacing of about $a=0.093$ fm. We obtain reduced Ioffe Time Distributions (rITDs) by computing appropriate matrix elements on the lattice, and elaborate on the extraction of the desired quark distributions from the rITDs following the pseudo-PDF approach. In our evaluation, the so-called “distillation” smearing method is employed, which allows for improved statistical precision over other methods, among other benefits. A number of techniques in order to ensure ground state dominance are further considered. Theoretical and experimental implications of our calculation are discussed.