Flavor decomposition of the nucleon unpolarized, helicity, and transversity parton distribution functions from lattice QCD simulations
Open Access
- 14 September 2021
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 104 (5), 054503
- https://doi.org/10.1103/physrevd.104.054503
Abstract
We present results on the quark unpolarized, helicity and transversity parton distributions functions of the nucleon. We use the quasiparton distribution approach within the lattice QCD framework and perform the computation using an ensemble of twisted mass fermions with the strange and charm quark masses tuned to approximately their physical values and light quark masses giving pion mass of 260 MeV. We use hierarchical probing to evaluate the disconnected quark loops. We discuss identification of ground state dominance, the Fourier transform procedure and convergence with the momentum boost. We find nonzero results for the disconnected isoscalar and strange quark distributions. The determination of the quark parton distribution and in particular the strange quark contributions that are poorly known provide valuable input to the structure of the nucleon.Funding Information
- U.S. Department of Energy (DE-SC0020405, DE-AC05-00OR22725)
- H2020 Marie Skłodowska-Curie Actions (765048)
- Temple University
- National Science Foundation (1625061)
- Army Research Laboratory (W911NF-16-2-0189)
- Office of Science
- Cyprus Research and Innovation foundation (POST-DOC/0718/0100)
- Cyprus Institute
- CINECA (Pra13_3304)
This publication has 111 references indexed in Scilit:
- Extraction of spin-dependent parton densities and their uncertaintiesPhysical Review D, 2009
- Dynamical twisted mass fermions with light quarks: simulation and analysis detailsComputer Physics Communications, 2008
- Impact of CLAS and COMPASS data on polarized parton densities and higher twistPhysical Review D, 2007
- Strange quark asymmetry in the nucleon and the NuTeV anomalyPhysical Review D, 2004
- Perturbative Generation of a Strange-Quark Asymmetry in the NucleonPhysical Review Letters, 2004
- Chirally improving Wilson fermions I. O(a) improvementJournal of High Energy Physics, 2004
- The static approximation of heavy-light quark systems. A detailed lattice studyNuclear Physics B, 1994
- A study of smearing techniques for hadron correlation functionsNuclear Physics B - Proceedings Supplements, 1990
- A lattice study of nucleon structureNuclear Physics B, 1989
- Improved continuum limit lattice action for QCD with wilson fermionsNuclear Physics B, 1985