Test of the flavour independence of $\alpha_s$ using next-to-leading order calculations for heavy quarks

The OPAL Collaboration: G. Abbiendi - et al.

doi:doi:10.1007/s100529900225

EPJ

Test of the flavour independence of $\alpha_s$ using next-to-leading order calculations for heavy quarks

The OPAL Collaboration

G.Abbiendi $^{\rm 2}$ - et al.

² Dipartimento di Fisica dell' Università di Bologna and INFN, 40126 Bologna, Italy

Received: 18 March 1999 / Published online: 14 October 1999

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 $\ensuremath{\alpha_s}$ in three flavour tagged samples (uds, c and b). The event shape distributions were fitted by $\ensuremath{\mathcal{O}(\alpha_s^2)}$ calculations of jet production taking into account mass effects for the c and b quarks. We find:
${\alpha_s^\mathrm{c}/\alpha_s^\mathrm{uds}}= 0.997 \pm 0.038 (stat.) \pm 0.030 (syst.) \pm 0.012 (theory)\quad$ and ${\alpha_s^\mathrm{b}/\alpha_s^\mathrm{uds}}= 0.993 \pm 0.008 (stat.) \pm 0.006 (syst.) \pm 0.011 (theory)$ .

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Test of the flavour independence of using next-to-leading order calculations for heavy quarks

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Test of the flavour independence of $\alpha_s$ using next-to-leading order calculations for heavy quarks