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

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • OPAL Collaboration
<mark>Journal publication date</mark>12/1999
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number4
Number of pages17
Pages (from-to)643-659
Publication StatusPublished
<mark>Original language</mark>English


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 αs in three flavour tagged samples (uds, c and b). The event shape distributions were fitted by O(α2s) calculations of jet production taking into account mass effects for the c and b quarks. We find:
αcs/αuds = 0.997 ± 0.038 (stat.) ± 0.030 (syst.) ± 0.012 (theory) and
αbs/αuds = 0.993 ± 0.008 (stat.) ± 0.006 (syst.) ± 0.011 (theory).