QCD Calculation of the $B\to \pi ,K$ Form Factors

Abstract

We calculate the form factors for the heavy-to-light transitions $B\to \pi ,K$ by means of QCD sum rules using $\pi$ and $K$ light-cone wave functions. Higher twist contributions as well as gluonic corrections are taken into account. The sensitivity to the shape of the leading-twist wave functions and effects of SU(3)-breaking are discussed. The results are compared with quark model predictions and with the results from QCD sum rules for three-point correlators.

Comments: 13 pages +5 figures available upon request , LaTeX , CERN-TH.6880/93, MPI-Ph/93-32, LMU-07/93