Srimoy Bhattacharya (Indian Institute of Technology) - Looking for possible new physics in b → cτ ντ in light of recent data

Thursday, 5 July 2018 from to (Europe/Rome)
at Dipartimento di Matematica e Fisica ( Aula A )
via della Vasca Navale 84
Description
The semitaunic decays B    D(∗)τ ντ  have  drawn a lot of attention in    recent years as sensitive probes of New Physics (NP). The measured values of  R(D) and R(D∗) from different experimental collaborations show significant deviations from their theoretical Standard Model (SM) predictions. There are several NP models capable of describing these observed deviations and one is thus confronted with the problem of model selection. We have done a model independent  analysis of the  NP affecting the  b    cτ ντ  decay  modes in light    of the available data from BABAR, Belle and LHCb. Considering all possible combinations of the lowest dimensional effective operators in b  cτ ντ  decays  and using the Akaike Information Criterion,  we  find out the scenarios which  can best explain the available data on these channels.  In the selected scenarios, best-fit values and correlations of the new parameters are extracted. Using these results, predictions are made on various observables in the exclusive and inclusive semitaunic b c decays. The graphical correlations between these observables are shown, which are found to be useful in discriminating various new physics scenarios.


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