Test of the Flavour Independence of alphas using Next-to-Leading Order Calculations for Heavy Quarks
The OPAL Collaboration, G. Abbiendi et al
Abstract
We present a test of the flavour independence of the strong coupling constant for charm and bottom quarks with respect to light (uds) quarks, based on a hadronic event sample obtained with the OPAL detector at LEP. Five observables related to global event shapes were used to measure alphas in three flavour tagged samples (uds, c and b). The event shape distributions were fitted by Order(alphas**2) calculations of jet production taking into account mass effects for the c and b quarks. We find: = 0.997 +- 0.038(stat.) +- 0.030(syst.) +- 0.012(theory) and = 0.993 +- 0.008(stat.) +- 0.006(syst.) +- 0.011(theory) for the ratios alphas(charm)/alphas(uds) and alphas(b)/alphas(uds) respectively.
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