B->pi,K,eta Decay Formfactors from Light-Cone Sum Rules

Details B->pi,K,eta Decay Formfactors from Light-Cone Sum Rules B->pi,K,eta Decay Formfactors from Light-Cone Sum Rules

2004-06-23

arxiv.org/abs/hep-ph/0406261v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages; talk given at Continuous Advances in QCD 2004, Minneapolis, May 2004

Scientific paper

We present an improved calculation of all B -> light pseudoscalar formfactors from light-cone sum rules, including one-loop radiative corrections to twist-2 and twist-3 contributions, and leading order twist-4 corrections. The total theoretical uncertainty of our results at zero momentum transfer is 10 to 13%. The dependence of the formfactors on the momentum transfer q^2 is parametrized in a simple way that is consistent with their analytical properties and is valid for all physical q^2. The uncertainty of the extrapolation in q^2 on the semileptonic decay rate Gamma(B -> pi e nu) is estimated to be 5%.

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