Renormalization-mass scale dependence in qcd contributions to semileptonic b → u decay
Ahmady, M.R. Chishtie, F.A. Elias, V. Fariborz, A.H. McKeon, D.G.C. Sherry, T.N. Steele, T.G.
Ahmady, M.R.
Chishtie, F.A.
Elias, V.
Fariborz, A.H.
McKeon, D.G.C.
Sherry, T.N.
Steele, T.G.
Publication Date
2003-02-01
Keywords
Type
Article
Downloads
Citation
Ahmady, M.R. Chishtie, F.A.; Elias, V.; Fariborz, A.H.; McKeon, D.G.C.; Sherry, T.N.; Steele, T.G. (2003). Renormalization-mass scale dependence in qcd contributions to semileptonic b → u decay. Nuclear Physics B - Proceedings Supplements 115 , 85-88
Abstract
QCD contributions to the b --> ul(-)v(l) decay rate, which are known to two-loop order in the MS scheme, exhibit sufficient dependence on the renormalization mass mu to compromise phenomenological predictions for inclusive semileptonic B --> X-u processes. Such scale dependence is ameliorated by the renormalization-group (RG) extraction and summation of all leading and RG-accessible subleading logarithms occurring subsequent to two-loop order in the perturbative series. This optimal RG-improvement of the known portion of the perturbative series virtually eliminates mu-dependence as a source of theoretical uncertainty in the predicted semileptonic B --> X-u inclusive rate.
Funder
Publisher
Elsevier BV
Publisher DOI
Rights
Attribution-NonCommercial-NoDerivs 3.0 Ireland