Speaker
Achim Geiser
(Deutsches Elektronen-Synchrotron Hamburg and Zeuthen (DE))
Description
The combined HERA data on charm production in deep inelastic scattering have recently
been used to determine the charm quark running mass $m_c(m_c)$ in the $\overline{MS}$ renormalisation
scheme. The same data are used differentially as a function of the photon virtuality
Q² to evaluate the charm quark running mass at different scales to one-loop order. The scale
dependence of the mass is found to be consistent with QCD expectations, and a graphical
representation of the charm mass running, similar to the representation of the beauty mass
running from LEP data, is obtained from data for the first time.
