$��_b \to ��_c ��\bar��_��$ Decay in the Standard Model and with New Physics
| Autor: | Shivashankara, Shanmuka, Wu, Wanwei, Datta, Alakabha |
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| Rok vydání: | 2015 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1502.07230 |
| Popis: | Recently hints of lepton flavor non-universality emerged when the BaBar Collaboration observed deviations from the standard model predictions in $R(D^{(*)}) \equiv {\cal B}({\bar B} \to D^{(*)+} ��^- {\bar��}_��) / {\cal B}({\bar B} \to D^{(*)+} \ell^- {\bar��}_\ell)$ ($\ell =e,��$). Another test of this non-universality can be in the semi leptonic $��_{b}\to��_{c}��\bar��_��$ decay. In this work we present predictions for this decay in the standard model and in the presence of new-physics operators with different Lorentz structures. We present the most general four-fold angular distribution for this decay including new physics. For phenomenology, we focus on predictions for the decay rate and the differential distribution in the momentum transfer squared $q^2$. In particular, we calculate $R_{��_{b}} = \frac{BR[��_b \to ��_c ��\bar��_��]}{BR[��_b \to ��_c \ell \bar��_{\ell}]}$ where $\ell$ represents $��$ or $e$, and find the standard model prediction to be around $0.3$ while the new physics operators can increase or slightly decrease this value. 15 pages, 4 figures, 3 table. Accepted for publication in Physical review D |
| Databáze: | OpenAIRE |
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