2019/09/06 by Suman Kumbhakar, Ashutosh Kumar Alok, Dinesh Kumar +1 · 1 citation
Physics and Astronomy · #hep-ph
published as PoS EPS-HEP2019 (2020) 272 · 5 pages, Based on arXiv:1903.10486, Contribution to proceedings of EPS-HEP 2019, July 10-17, 2019, Ghent, Belgium
arxiv created 2019/09/06 · arxiv updated 2021/01/07
At Moriond 2019, Belle collaboration announced their new measurements on RD and RD^* which are in agreement with their Standard Model (SM) predictions within 1.2σ. After inclusion of these measurements, the discrepancy between the world averages and the SM predictions of RD-RD^* comes down from 4.1σ to 3.1σ. Here we do a global fit by taking all measurements in b→ cτν transition. We find that there are seven allowed new physics solutions, each with different Lorentz structure. Further we show that it is possible to distinguish between them by means of the five observables: the τ polarization fraction in the decay B → D τν, the precision measurement of RD, the forward-backward asymmetries in the decays B → (D,D^*) τν and the branching ratio of Bc→ τν.