2020/01/15 by Suman Kumbhakar, Ashutosh Kumar Alok, Dinesh Kumar +1
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1007/978-981-15-6292-1_53
published as Springer Proc.Phys. 248 (2020) 417-423 · 6 pages, 1 figure, Contribution to proceedings of Workshop on Frontiers in High Energy Physics 2019 (FHEP 2019), 14-17 Oct 2019, Hyderabad, Telangana, India. arXiv admin note: text overlap with arXiv:1909.02840
arxiv created 2020/01/15 · arxiv updated 2021/01/07
At Moriond 2019, Belle collaboration has announced new measurements on the flavour ratios RD - RD^* which are consistent with their Standard Model predictions within 1.2σ. After inclusion of these measurements, the global tension in RD - RD^* has reduced from 4.1σ to 3.1σ which is still significant. The measurements of these ratios indicate towards the violation of lepton flavor universality in b→ c l ν decay. Assuming new physics in b→ c τ ν transition, we have done a global fit to all available data in this sector to identify the allowed new physics solutions. We find that there are seven allowed new physics solutions which can account for all measurements in b→ c τ ν transition. We show that a simultaneous measurement of the τ polarization fraction and forward-backward asymmetry in B→ D τ ν, the zero crossing point of forward backward asymmetry in B→ D^*τν and the branching ratio of Bc→ τ ν decay can distinguish these seven new physics solutions if they can be measured with a required precision.