Abstract
The precise determination of the CKM matrix element |Vcb| is important to test the unitarity of the CKM matrix and to search for loop-level new physics effects. We present a new method for the determination of |Vcb| using q2 moments from B ? Xcl?¯l decays. With new experimental input it will be possible to determine the non-perturbative hadronic matrix elements entering the total semileptonic B ? Xcl?¯l rate in the heavy-quark expansion. Exploiting reparametrization invariance, the number of these parameters can be reduced to 8 at O(1/m4b). This method allows for the simultaneous determination of these parameters and |Vcb|, taking into account also the theoretical uncertainties from missing higher order contributions in the heavy quark expansion and corrections from the strong interaction.
| Original language | English |
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| Title of host publication | Proceedings of the 55th Rencontres de Moriond - 2021 Electroweak Interactions and Unified Theories, EW 2021 |
| Editors | Etienne Auge, Jacques Dumarchez, Jean Tran Thanh Van |
| Publisher | Association of IOC Recognised International Sport Federations |
| Pages | 417-420 |
| Number of pages | 4 |
| ISBN (Electronic) | 9791096879137 |
| Publication status | Published - 1 Jan 2021 |
| Event | 55th Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2021 - Online Duration: 21 Mar 2021 → 27 Mar 2021 Conference number: 55 https://cds.cern.ch/record/2753732 |
Conference
| Conference | 55th Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2021 |
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| Abbreviated title | Moriond EW 2021 |
| Period | 21/03/21 → 27/03/21 |
| Internet address |