On a possible measurement of alpha_s from B-Bbar correlations in Z^0 decay

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dc.creatorBrandenburg, A.
dc.creatorNason, P.
dc.creatorOleari, C.
dc.date2003-04-29
dc.date.accessioned2026-07-07T11:09:23Z
dc.date.available2026-07-07T11:09:23Z
dc.descriptionMotivated by recent preliminary results from the SLD Collaboration on the measurement of angle-dependent B-Bbar energy correlations in Z^0 -> b bbar events, we propose a class of observables that can be computed as a power expansion in the strong coupling constant alpha_s, of order alpha_s at the Born level and that can be used for a precision measurement of alpha_s(M_Z). We compute their next-to-leading order O(alpha_s^2) corrections in the strong coupling constant, including exactly quark-mass effects. We show that, in the theoretical evaluation of these quantities, large logarithms of the ratio of the mass of the final quark over the centre-of-mass energy cancel out. Thus, these variables have a well-behaved perturbative expansion in alpha_s(M_Z). We study the theoretical uncertainties due to the renormalization-scale dependence and the quark-mass scheme and we address the question of which mass scheme is more appropriate for these variables.
dc.description18 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0304272
dc.identifierhttp://arxiv.org/abs/hep-ph/0304272
dc.identifierNucl.Phys.B667:394-410,2003
dc.identifierdoi:10.1016/S0550-3213(03)00530-3
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190450
dc.subjectHigh Energy Physics - Phenomenology
dc.titleOn a possible measurement of alpha_s from B-Bbar correlations in Z^0 decay
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