New physics solutions for b→ cτν Anomalies After Moriond 2019

Abstract

At Moriond 2019, Belle collaboration has announced new measurements on the flavour ratios (formula presented) which are consistent with their Standard Model predictions within (formula presented). After inclusion of these measurements, the global tension in (formula presented) has reduced from (formula presented) which is still significant. The measurements of these ratios indicate towards the violation of lepton flavor universality in (formula presented) decay. Assuming new physics in (formula presented) 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 (formula presented) transition. We show that a simultaneous measurement of the (formula presented) polarization fraction and forward-backward asymmetry in (formula presented)(formula presented), the zero crossing point of forward backward asymmetry in (formula presented) and the branching ratio of (formula presented) decay can distinguish these seven new physics solutions if they can be measured with a required precision.