TTP07-38 Precise charm and bottom quark masses

New data for the total cross section $\sigma(e^+e^-\to\mbox{hadrons})$ in the charm and bottom threshold region are combined with an improved theoretical analysis, which includes recent four-loop calculations, to determine the short distance MSbar charm and bottom quark masses. The final result for the MSbar-masses, m_c(3 GeV) = 0.986(13) GeV and m_b(10 GeV) = 3.609(25) GeV is consistent with but significantly more precise than a similar previous study.