Determination of the charm-quark mass in the MS ˉ scheme using charm production data from deep-inelastic scattering at HERA

摘要

We determine the charm-quark mass m c ( m c ) in the MS ˉ scheme using measurements of charm production in deep-inelastic ep scattering at HERA in the kinematic range of photon virtuality 5 GeV 2 Q 2 1000 Ge V 2 and Bjorken scaling variable 10 ? 5 x 10 ? 1 . The extraction of m c from this process with space-like kinematics provides complementary information to results from hadronic processes. The QCD analysis of the HERA data yields a value of m c ( m c ) = 1.27 ± 0.05 ( exp ) ? 0.01 + 0.06 ( scale ) GeV at next-to-leading order and of m c ( m c ) = 1.36 ± 0.04 ( exp ) ? 0.00 + 0.04 ( scale ) ± 0.1 ( theory ) GeV at approximate next-to-next-to-leading order. The results are consistent with and of comparable precision as the world average.