2006/12/31 by Patricia Ball, Gareth W. Jones, Roman Zwicky · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.75.054004
published as Phys.Rev.D75:054004,2007 · 49 pages, version to appear in PRD
arxiv created 2007/02/09 · openalex publication_date 2007/03/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We calculate the main observables in Bu,d\ensuremath→(\ensuremathρ,\ensuremathω,K*)\ensuremathγ and Bs\ensuremath→(K*,\ensuremathφ)\ensuremathγ decays, i.e. branching ratios and CP and isospin asymmetries. We include QCD factorization results and also the dominant contributions beyond QCD factorization, namely, long-distance photon emission and soft-gluon emission from quark loops. All contributions beyond QCD factorization are estimated from light-cone sum rules. We devise, in particular, a method for calculating soft-gluon emission, building on earlier ideas developed for analogous contributions in nonleptonic decays. Our results are relevant for new-physics searches at the B factories, CERN LHC and a future superflavor factory. Using current experimental data, we also extract |Vtd/Vts| and the angle \ensuremathγ of the unitarity triangle. We give detailed tables of theoretical uncertainties of the relevant quantities which facilitates future determinations of these Cabibbo-Kobayashi-Maskawa parameters from updated experimental results.