出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We calculate electromagnetic mass difference of mesons using a method proposed by Duncan
et al. The RG-improved gauge action and the non-compact Abelian gauge action are employed
to generate configurations. Quark propagators in the range of mPS=mV = 0:760:51 are obtained
with the meanfield-improved clover quark action. Chiral and continuum extrapolations
are performed and the results are compared with experiments. Finite size effects are also examined.
Quark masses are extracted from the measured spectrum. Our preliminary values for
light quark masses are mMS
u (m = 2 GeV) = 3:03(19) MeV, mMS
d (m = 2 GeV) = 4:44(28) MeV,
mMS
s (m = 2 GeV) = 99:2(52) MeV.
