Al-Haydari, A. and Ali Khan, A. and Braun, Vladimir M. and Collins, Sara and Göckeler, Meinulf and Lacagnina, G. N. and Panero, M. and Schäfer, Andreas and Schierholz, Gerrit (2010) Semileptonic form factors D →π, K and B →π, K from a fine lattice. The European Physical Journal A - Hadrons and Nuclei 43 (1), pp. 107-120.
We extract the form factors relevant for semileptonic decays of D and B mesons from a relativistic computation on a fine lattice in the quenched approximation. The lattice spacing is a=0.04 fm (corresponding to a^=4.97 GeV), which allows us to run very close to the physical B meson mass, and to reduce the systematic errors associated with the extrapolation in terms of a heavy quark expansion. For decays of D and D_s mesons, our results for the physical form factors at q^2=0 are as follows: f_+^(0)= 0.74(6)(4), f_+^(0)= 0.78(5)(4) and f_+^(0)=0.68(4)(3). Similarly, for B and B_s we find: f_+^(0)=0.27(7)(5), f_+^(0)=0.32(6)(6) and f_+^(0)=0.23(5)(4). We compare our results with other quenched and unquenched lattice calculations, as well as with light-cone sum rule predictions, finding good agreement.
|Institutions:||Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||15 Mar 2010 13:15|
|Last Modified:||20 Jul 2011 22:23|