Simultaneous Explanation of the $R_K$ and $R(D^{(*)})$ Puzzles
| Autor: | Bhattacharya, Bhubanjyoti, Datta, Alakabha, London, David, Shivashankara, Shanmuka |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Phys. Lett. B, 742 (2015) 370-374 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physletb.2015.02.011 |
| Popis: | At present, there are several hints of lepton flavor non-universality. The LHCb Collaboration has measured $R_K\equiv{\cal B}(B^+ \to K^+ \mu^+ \mu^-)/{\cal B}(B^+ \to K^+ e^+ e^-)$, and the BaBar Collaboration has measured $R(D^{(*)}) \equiv {\cal B}({\bar B} \to D^{(*)+} \tau^- {\bar\nu}_\tau) / {\cal B}({\bar B} \to D^{(*)+} \ell^- {\bar\nu}_\ell)$ ($\ell = e,\mu$). In all cases, the experimental results differ from the standard model predictions by 2-3$\sigma$. Recently, an explanation of the $R_K$ puzzle was proposed in which new physics (NP) generates a neutral-current operator involving only third-generation particles. Now, assuming the scale of NP is much larger than the weak scale, this NP operator must be made invariant under the full $SU(3)_C \times SU(2)_L \times U(1)_Y$ gauge group. In this Letter, we note that, when this is done, a new charged-current operator can appear, and this can explain the $R(D^{(*)})$ puzzle. A more precise measurement of the double ratio $R(D)/R(D^*)$ can rule out this model. Comment: 11 pages, text and citations added, version published in Phys. Lett. B |
| Databáze: | arXiv |
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