3,863 research outputs found
Diquark mass differences from unquenched lattice QCD
We calculate diquark correlation functions in the Landau gauge on the lattice
using overlap valence quarks and 2+1-flavor domain wall fermion configurations.
Quark masses are extracted from the scalar part of quark propagators in the
Landau gauge. Scalar diquark quark mass difference and axial vector scalar
diquark mass difference are obtained for diquarks composed of two light quarks
and of a strange and a light quark. Light sea quark mass dependence of the
results is examined. Two lattice spacings are used to check the discretization
effects. The coarse and fine lattices are of sizes and
with inverse spacings and , respectively.Comment: 9 figure
Proton Mass Decomposition from the QCD Energy Momentum Tensor
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 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 scheme
at 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 and quark scalar condensates. The and
glue momentum fractions in the scheme are in good agreement
with global analyses at GeV.Comment: 10 pages, 6 figure
RI/MOM and RI/SMOM renormalization of overlap quark bilinears on domain wall fermion configurations
Renormalization constants (RCs) of overlap quark bilinear operators on
2+1-flavor domain wall fermion configurations are calculated by using the
RI/MOM and RI/SMOM schemes. The scale independent RC for the axial vector
current is computed by using a Ward identity. Then the RCs for the quark field
and the vector, tensor, scalar and pseudoscalar operators are calculated in
both the RI/MOM and RI/SMOM schemes. The RCs are converted to the
scheme and we compare the numerical results from using the
two intermediate schemes. The lattice size is and the inverse
spacing .Comment: Minor changes and updates of Figure 10 and 15 to be more clea
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