Spectator interactions in B -> V gamma decays and QCD factorisation

Descotes-Genon, S. and Sachrajda, C.T. (2004) Spectator interactions in B -> V gamma decays and QCD factorisation. Nuclear Physics B, 693, (1-3), 103-133. (doi:10.1016/j.nuclphysb.2004.06.018).


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We study the radiative decays B→Vγ (where V=ρ,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 O(MBΛQCD) leads to the presence of Sudakov logarithms. We indicate how the demonstration of factorisation can be extended to other (four-quark) operators.

Item Type: Article
ISSNs: 0550-3213 (print)
Related URLs:
Subjects: Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Physics and Astronomy
ePrint ID: 57169
Date Deposited: 14 Aug 2008
Last Modified: 06 Aug 2015 02:46
URI: http://eprints.soton.ac.uk/id/eprint/57169

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