期刊
PHYSICAL REVIEW D
卷 104, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.054503
关键词
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资金
- U.S. Department of Energy Early Career Award [DE-SC0020405]
- Cyprus Research and Innovation Foundation [POST-DOC/0718/0100]
- Marie Sklodowska-Curie European Joint Doctorate program STIMULATE of the European Commission [765048]
- National Science Foundation [1625061]
- US Army Research Laboratory [W911NF-16-2-0189]
- Office of Science of the U.S. Department of Energy
- Extended Twisted Mass Collaboration on the KNL (A2) Partition of Marconi at Consorzio Interuniversitario per il Calcolo Automatico dell'Italia Nord-orientale (CINECA) [Pra13_3304]
- DOE Office of Science [DE-AC05-00OR22725]
- U.S. Department of Energy (DOE) [DE-SC0020405] Funding Source: U.S. Department of Energy (DOE)
In this study, results on the quark unpolarized, helicity, and transversity parton distributions functions of the nucleon were presented using the quasiparton distribution approach within the lattice QCD framework. Nonzero results for the disconnected isoscalar and strange quark distributions were found, providing valuable input to the understanding of the nucleon structure.
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.
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