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 Nf=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 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 MS scheme are in good agreement with global analyses at μ=2 GeV.
@article{arxiv.1808.08677,
title = {Proton Mass Decomposition from the QCD Energy Momentum Tensor},
author = {Yi-Bo Yang and Jian Liang and Yu-Jiang Bi and Ying Chen and Terrence Draper and Keh-Fei Liu and Zhaofeng Liu},
journal= {arXiv preprint arXiv:1808.08677},
year = {2018}
}