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2017

Exploring $R_D$, $R_{D^{\ast}}$ and $R_{J/\Psi}$ anomalies

Dutta, Rupak

Understand

Deviations from the standard model predictions have been reported in various observables concerned with the lepton flavor universality.

At present, the deviation of the measured values of $R_D$ and $R_{D^{\ast}}$ from the standard model expectation is exceeded by $2.3\sigma$ and $3.4\sigma$, respectively.
Very recently LHCb has measured the ratio of branching ratio $R_{J/\Psi} = \mathcal B(B_c \to J/\Psi\tau\nu)/\mathcal B(B_c \to J/\Psi\,l\,\nu)$, where $l \in (e,\,\mu)$, to be $0.71\pm0.17\pm 0.18$ which is at more than $2\sigma$ away from the standard model prediction.
We investigate the anomalies in $R_D$, $R_{D^{\ast}}$, and $R_{J/\Psi}$ using a model independent framework with minimal number of new physics couplings.