论文

论文

Proton Mass Decomposition from the QCD Energy Momentum Tensor
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论文题目: Proton Mass Decomposition from the QCD Energy Momentum Tensor
论文题目英文:
作者: Yang, Yi-Bo; Liang, Jian; Bi, Yu-Jiang; Chen, Ying; Draper, Terrence; Liu, Keh-Fei; Liu, Zhaofeng
论文出处:
刊物名称: PHYSICAL REVIEW LETTERS
: 2018
: 121
: 21
: 212001
联系作者: Yang, YB (reprint author)
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摘要: We report results on the proton mass decomposition and also on related quark and glue momentum fractions. The results are based on overlap valence fermions on four ensembles of N-f = 2 + 1 domain wall fermion configurations with three lattice spacings and three volumes, and several pion masses including the physical pion mass. With fully nonperturbative renormalization (and universal normalization on both quark and gluon), we find that the quark energy and glue field energy contribute 32(4)(4)% and 36(5)(4)% respectively in the (MS) over bar (modified minimal substraction) scheme at is mu = 2 GeV. A quarter of the trace anomaly gives a 23(1)(1)% contribution to the proton mass based on the sum rule, given 9(2)(1)% contribution from the u, d, and s quark scalar condensates. The u, d, s, and glue momentum fractions in the (MS) over bar scheme are in good agreement with global analyses at it mu = 2 GeV.
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