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arXiv 1808.08677hep-lathep-phnucl-th
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由QCD能量动量张量分解质子质量

Proton Mass Decomposition from the QCD Energy Momentum Tensor

Yi-Bo Yang, Jian Liang, Yu-Jiang Bi, Ying Chen, Terrence Draper, Keh-Fei Liu, Zhaofeng Liu

摘要:

我们报告的质子质量分解的结果,也对相关的夸克和胶动量分数。结果是基于重叠价费米子上的四个系综的$N_f = 2+1$ π组态与三个晶格间距和三个体积,和几个π质量,包括物理π质量。在完全非微扰重整化(以及夸克和胶子的普适重整化)下,我们发现在$μ= 2$ GeV的$\overline{MS}$方案中夸克能量和胶场能量分别贡献33(4)(4)%和37(5)(4)%.根据求和规则,四分之一的迹线异常对质子质量的贡献为23(1)(1)%,而$u, d,$和$s$夸克标量凝聚的贡献为9(2)(1)%。在$\overline{MS}$方案中的$u,d,s$和胶动量分数在$μ= 2$ GeV与全球分析吻合良好。

英文摘要:

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 $N_f = 2+1$ DWF configurations with three lattice spacings and three volumes, and several pion masses including the physical pion mass. With fully non-perturbative renormalization (and universal normalization on both quark and gluon), we find that the quark energy and glue field energy contribute 33(4)(4)\% and 37(5)(4)\% respectively in the $\overline{MS}$ scheme at $μ= 2$ 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 $\overline{MS}$ scheme are in good agreement with global analyses at $μ= 2$ GeV.

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