期刊
PHYSICAL REVIEW D
卷 102, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.102.014508
关键词
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资金
- Ministry of Science and Technology of China under 973 project Systematic studies on light hadron spectroscopy [2015CB856702]
- DFG [TRR 110, 392578569]
- NSFC [11621131001]
- NSFC of China [11775002]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [642069]
- National Science Centre (Poland) Grant SONATA BIS [2016/22/E/ST2/00013]
- U.S. Department of Energy, Office of Nuclear Physics
- Cyprus Research Promotion foundation [POST-DOC/0718/0100]
- JUWELS at the Juelich Supercomputing Centre [ECY00]
- KNL (A2) Partition of Marconi at CINECA [Pra13_3304]
We perform a first calculation for the unpolarized parton distribution function of the Delta(+) baryon using lattice QCD simulations within the framework of large momentum effective theory. Two ensembles of N-f = 2 + 1 + 1 twisted mass fermions are utilized with a pion mass of 270 and 360 MeV, respectively. The baryon, which is treated as a stable single-particle state, is boosted with momentum P-3 with values {0.42, 0.83, 1.25} GeV, and we utilize momentum smearing to improve the signal. The unpolarized parton distribution function of Delta(+) is obtained using a nonperturbative renormalization and a one-loop formula for the matching, with encouraging precision. In particular, we compute the (d) over bar (x) - (u) over bar (x) asymmetry and compare it with the same quantity in the nucleon, in a first attempt towards resolving the physical mechanism responsible for generating such asymmetry.
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