2004/03/31 by S. Descotes-Genon, Sébastien Descotes–Genon, C. T. Sachrajda +1 · 4 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/j.nuclphysb.2004.06.018
published as Nucl.Phys.B693:103-133,2004 · 40 pages, 18 figures
arxiv created 2004/04/05 · openalex publication_date 2004/07/06 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the radiative decays B -> V gamma (where V=rho, K^*) in the framework of QCD factorisation, and in particular the hard-spectator contributions to the decay amplitudes. For the phenomenologically significant chromomagnetic operator, we show by an explicit next-to-leading-order computation that the spectator interactions factorise in the heavy-quark limit, i.e. that they can be written as the convolution of a hard-scattering kernel, computable in perturbation theory, and of the light-cone distribution amplitudes for the B and V mesons which contain the soft physics. The presence of an intermediate scale of order sqrtLambdaQCD MB leads to the presence of Sudakov logarithms. We indicate how the proof of factorisation can be extended to other (four-quark) operators.