Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-02-02
Phys.Lett. B382 (1996) 157-164
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages for text plus 4 pages for figures which were tar'ed, gzip'ed, uuencoded and put as one package. Original text is in P
Scientific paper
10.1016/0370-2693(96)00570-9
We have applied so-called `optimised' perturbation theory to resolve the renormalisation-scale (mu) ambiguity of exact O(alpha_s^2) QCD calculations of event shape observables in e+e- --> hadrons. We fitted the optimised predictions for 15 observables to hadronic Z0 decay data from the SLD experiment to determine alpha_s(M_Z^2). Comparing with results using the physical scale mu = M_Z we found no reduction in the scatter among alpha_s(M_Z^2) values from the 15 observables, implying that the O(alpha_s^2) predictions with optimised scales are numerically no closer to the exact all-orders results than those with the physical scale.
Burrows P. N.
Masuda Hiroyuki
Muller Daniel
Ohnishi Y.
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