Light Quark Masses : a Status Report at Dpf 2000
نویسنده
چکیده
Significant progress has been made since 1996 in the determination of the light quark masses from both lattice QCD (LQCD) and QCD sumrules (SR). The evolution in time of the ranges quoted by the Particle Data Group and our best estimates as of DPF2000 are given below. Since the scale dependence between 2 and 1 GeV is very large, we quote all results in the MS scheme at scale μ = 2 GeV. Results at the lower scale 1 GeV may be obtained via mq(1 GeV) = 1.38mq(2 GeV) where the factor 1.38 corresponds to 4-loop running, with αs(m 2 τ ) = 0.334 . In quoting separate values for mu and md we have employed the ratio mu/md = 0.553, obtained from ChPT. The basis for these estimates is outlined briefly below. A more detailed discussion will appear in an extended version of this writeup .
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