| Autor: |
Al-Haydari, A., Ali Khan, A., Braun, Vladimir M., Collins, Sara, Göckeler, Meinulf, Lacagnina, G. N., Panero, M., Schäfer, Andreas, Schierholz, Gerrit |
| Rok vydání: |
2010 |
| Předmět: |
|
| DOI: |
10.5283/epub.13547 |
| Popis: |
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^{-1}=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_+^{D to pi}(0)= 0.74(6)(4), f_+^{D to K}(0)= 0.78(5)(4) and f_+^{D_s to K}(0)=0.68(4)(3). Similarly, for B and B_s we find: f_+^{B to pi}(0)=0.27(7)(5), f_+^{B to K}(0)=0.32(6)(6) and f_+^{B_s to K}(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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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