Abstract
Combined HERA data on charm production in deep-inelastic scattering have
previously been used to determine the charm-quark running mass \$m\_c(m\_c)\$ in
the MSbar renormalisation scheme. Here, the same data are used as a function of
the photon virtuality \$Q^2\$ to evaluate the charm-quark running mass at
different scales to one-loop order, in the context of a next-to-leading order
QCD analysis. The scale dependence of the mass is found to be consistent with
QCD expectations.
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