2005/05/31 by H. M. Asatrian, C. Greub, A. Hovhannisyan +3 · 21 citations
Physics and Astronomy · #Bar (unit) #Charm (quantum number) #Charm quark #High-Energy Particle Collisions Research #Mathematical physics #Observable #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Renormalization #hep-ph
paper · pdf · open access · doi:10.1016/j.physletb.2005.05.080
published in Physics Letters B 619(3-4), 322-332 (Elsevier BV) · 13 pages including 3 figures
arxiv created 2005/06/14 · openalex publication_date 2005/06/21 · arxiv updated 2011/01/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The uncertainty of the theoretical prediction of the B ¯ → X s γ branching ratio at NLL level is dominated by the charm mass renormalization scheme ambiguity. In this Letter we calculate those NNLL terms which are related to the renormalization of m c , 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 ¯ → X s γ ) induced by the definition of m c . 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 s γ to possible new degrees of freedom beyond the SM significantly.