Heavy flavour mass corrections to the longitudinal and transverse cross sections in e(+)e(-)-collisions

摘要

We present the heavy flavour mass corrections to the order alpha(s) corrected longitudinal(sigma(L)) and transverse (sigma(T)) cross sections in e(+)e(-)-collisions. Its effect on the value of the running coupling constant extracted from the longitudinal cross section is investigated. Furthermore we make a comparison between the size of these mass corrections and the magnitude of the order alpha(s)(2) contribution to sigma(T) and sigma(L) which has been recently calculated for massless quarks. Also studied will be the changes in the above quantities when the fixed pole mass scheme is replaced by the running mass approach. (C) 1998 Elsevier Science B.V. All rights reserved. References: 31