Download or read book Semileptonic Form-factors from B to K*[gamma] Decays in the Large Energy Limit written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Making use of the measurement of the B 2!K*[gamma] branching ratio together with the relations following from the limit of high recoil energy, we obtain stringent constraints on the values of the form-factors entering in heavy-to-light B 2!Vll' processes such as B 2!K*ll−, B 2!K*[nu]{bar [nu]} and B 2![rho]l{nu} decays. They show that the symmetry predictions, when combined with the experimental information on radiative decays, specify a severely restricted set of values for the vector and axial-vector form-factors evaluated at zero momentum transfer, q2 = 0. These constraints can be used to test model calculations and to improve our understanding of the q2-dependence of semileptonic form-factors. We stress that the constraints remain stringent even when corrections are taken into account.