Form Factors for B -> pi l nu-bar_l and B -> K* gamma Decays on the Lattice

Details Form Factors for B -> pi l nu-bar_l and B -> K* gamma Decays on the Lattice Form Factors for B -> pi l nu-bar_l and B -> K* gamma Decays on the Lattice

1995-03-02

arxiv.org/abs/hep-lat/9503002v1

Nucl.Phys.B447:425-440,1995

Physics

High Energy Physics

High Energy Physics - Lattice

13 pages, uuencoded compressed postscript file (including five figures). Also available from http://wwwhep.phys.soton.ac.uk/

Scientific paper

10.1016/0550-3213(95)00223-F

We present a unified method for analysing form factors in B -> pi l nu-bar_l and B -> K* gamma decays. The analysis provides consistency checks on the q^2 and 1/M extrapolations necessary to obtain the physical decay rates. For the first time the q^2 dependence of the form factors is obtained at the B scale. In the B -> pi l nu-bar_l case, we show that pole fits to f^+ may not be consistent with the q^2 behaviour of f^0, leading to a possible factor of two uncertainty in the decay rate and hence in the value of |V_{ub}|^2 deduced from it. For B -> K* gamma, from the combined analysis of form factors T_1 and T_2, we find the hadronisation ratio R_{K^*} of the exclusive B -> K* gamma to the inclusive b -> s gamma rates is of order 35% or 15% for constant and pole-type behaviour of T_2 respectively.

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