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- Title
Revisiting the new-physics interpretation of the b → cτν data.
- Authors
Shi, Rui-Xiang; Geng, Li-Sheng; Grinstein, Benjamín; Jäger, Sebastian; Camalich, Jorge Martin
- Abstract
We revisit the status of the new-physics interpretations of the anomalies in semileptonic B decays in light of the new data reported by Belle on the lepton-universality ratios RD(*) using the semileptonic tag and on the longitudinal polarization of the D* in B → D*τν, F L D ∗ . The preferred solutions involve new left-handed currents or tensor contributions. Interpretations with pure right-handed currents are disfavored by the LHC data, while pure scalar models are disfavored by the upper limits derived either from the LHC or from the Bc lifetime. The observable F L D ∗ also gives an important constraint leading to the exclusion of large regions of parameter space. Finally, we investigate the sensitivity of different observables to the various scenarios and conclude that a measurement of the tau polarization in the decay mode B → Dτν would effectively discriminate among them.
- Subjects
DATA; QUARKS; POLARIZATION (Nuclear physics)
- Publication
Journal of High Energy Physics, 2019, Vol 2019, Issue 12, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP12(2019)065