Kinetic corrections to B -> X_c l nu at one loop
| Autor: | Becher, Thomas, Boos, Heike, Lunghi, Enrico |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | JHEP 0712:062,2007 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1126-6708/2007/12/062 |
| Popis: | We evaluate the one-loop corrections to the Wilson coefficient of the kinetic operator in the operator product expansion of the differential B -> X_c l nu decay rate. With a moderate cut on the lepton energy, the one-loop terms change the kinetic operator contributions to spectral moments by about 20%. This amounts to a small correction for leptonic and hadronic moments, except for those which vanish at the lowest order, where the effect can be sizable. Together with a two-loop calculation of the leading-power rate and an evaluation of the one-loop corrections to the Wilson coefficient of the chromo-magnetic operator, our results will allow for a high-precision determination of |V_cb| and the b- and c-quark masses. Comment: 18 pages, 2 figures |
| Databáze: | arXiv |
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