<x>_{u-d} from lattice QCD at nearly physical quark masses

Gunnar S. Bali; Sara Collins; Mridupawan Deka; Benjamin Glaessle; Meinulf Gockeler; Johannes Najjar; Andrea Nobile; Dirk Pleiter; Andreas Schafer; Andre Sternbeck

doi:10.1103/PhysRevD.86.054504

<x>_{u-d} from lattice QCD at nearly physical quark masses

High Energy Physics - Lattice 2013-05-30 v2 High Energy Physics - Phenomenology

Authors: Gunnar S. Bali , Sara Collins , Mridupawan Deka , Benjamin Glaessle , Meinulf Gockeler , Johannes Najjar , Andrea Nobile , Dirk Pleiter , Andreas Schafer , Andre Sternbeck

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

We determine the second Mellin moment of the isovector quark parton distribution function <x>_{u-d} from lattice QCD with N_f=2 sea quark flavours, employing the non-perturbatively improved Wilson-Sheikholeslami-Wohlert action at a pseudoscalar mass of 157(6) MeV. The result is converted non-perturbatively to the RI'-MOM scheme and then perturbatively to the MSbar scheme at a scale mu = 2 GeV. As the quark mass is reduced we find the lattice prediction to approach the value extracted from experiments.

Keywords

lattice qcd parton distribution function mellin moment wilson-clover action physical quark masses ri'-mom scheme msbar scheme isovector

Cite

@article{arxiv.1207.1110,
  title  = {<x>_{u-d} from lattice QCD at nearly physical quark masses},
  author = {Gunnar S. Bali and Sara Collins and Mridupawan Deka and Benjamin Glaessle and Meinulf Gockeler and Johannes Najjar and Andrea Nobile and Dirk Pleiter and Andreas Schafer and Andre Sternbeck},
  journal= {arXiv preprint arXiv:1207.1110},
  year   = {2013}
}

Comments

4 pages, 3 figures, v2: minor updates including journal refs

<x>_{u-d} from lattice QCD at nearly physical quark masses

Abstract

Keywords

Cite

Comments

Related papers