出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report RBC and RBC/UKQCD lattice QCD numerical calculations of nucleon electroweak
matrix elements with dynamical domain-wall fermions (DWF) quarks. The first, RBC, set of
dynamical DWF ensembles employs two degenerate flavors of DWF quarks and the DBW2 gauge
action. Three sea quark mass values of 0.04, 0.03 and 0.02 in lattice units are used with about 200
gauge configurations each. The lattice cutoff is a−1 ∼ 1.7GeV and the spatial volume is about
(1.9fm)3. Despite the small volume, the ratio of the isovector vector and axial charges gA/gV
and that of structure function moments hxiu−d/hxiDu−Dd are in agreement with experiment, and
show only very mild quark mass dependence. The second, RBC/UK, set of ensembles employs
one strange and two degenerate (up and down) dynamical DWF quarks and Iwasaki gauge action.
The strange quark mass is set at 0.04, and three up/down mass values of 0.03, 0.02 and 0.01
in lattice units are used. The lattice cutoff is a−1 ∼ 1.6GeV and the spatial volume is about
(3.0fm)3. Even with preliminary statistics of 25-30 gauge configurations, the ratios gA/gV and
hxiu−d/hxiDu−Dd are consistent with experiment and show only verymild quarkmass dependence.
Another structure function moment, d1, though yet to be renormalized, appears small in both sets.
