Reduction of Quark Mass Scheme Dependence in B bar -> Xs gamma at the NNLL Level Page: 1 of 14
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Reduction of Charm Quark Mass Scheme Dependence
in B -* X,7 at the NNLL Level
H.M. Asatriana, C. Greubb, A. Hovhannisyana,
T. Hurthlcd, and V. Poghosyana
a Yerevan Physics Institute, 375036, Yerevan, Armenia
b Institute for Theoretical Physics, University Berne, CH-3012 Berne, Switzerland
Theoretical Physics Division, CERN, CH-1211 Geneva 23, Switzerland
d SLAC, Stanford University, Stanford, CA 94309, USA
The uncertainty of the theoretical prediction of the B - X,- branching ratio at
NLL level is dominated by the charm mass renormalization scheme ambiguity. In
this paper we calculate those NNLL terms which are related to the renormalization
of m,, in order to get an estimate of the corresponding uncertainty at the NNLL
level. We find that these terms significantly reduce (by typically a factor of two) the
error on BR(B -* Xy) induced by the definition of m,. Taking into account the
experimental accuracy of around 10% and the future prospects of the B factories, we
conclude that a NNLL calculation would increase the sensitivity of the observable
B -* X,- to possible new degrees of freedom beyond the SM significantly.
Work supported in part by Department of Energy contract DE-AC02-76SF00515
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Asatrian, H.M.; Inst., /Yerevan Phys.; Greub, C.; U., /Bern; Hovhannisyan, A.; Inst., /Yerevan Phys. et al. Reduction of Quark Mass Scheme Dependence in B bar -> Xs gamma at the NNLL Level, article, June 20, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc874863/m1/1/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.