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

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

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Burford, D.R.; Duong, H.D.; Flynn, Jonathan M.; Gough, B.J.; Hazel, Nick; Nieves Pamplona, Juan Miguel; Shanahan, Hugh P.

Aquest document és un/a article, creat/da en: 1995

We present a unified method for analysing form factors in B --> pi l ($) over bar nu(l) and B --> K*gamma decays. The analysis provides consistency checks on the q(2) and 1/M extrapolations necessary to obtain the physical decay rates. For the first time the q(2) dependence of the form factors is obtained at the B scale. In the B --> pi l ($) over bar nu(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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