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Resolution of $R_D$/$R_{D^*}$ puzzle · Around

2018

Resolution of $R_D$/$R_{D^*}$ puzzle

Alok, Ashutosh Kumar, Kumar, Dinesh, Kumbhakar, Suman et al.

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One of the exciting results in flavor physics in recent times is the $R_D$/$R_{D^*}$ puzzle.

The measurements of these flavor ratios performed by the B-factory experiments, BaBar and Belle, and the LHCb experiment are about $4\sigma$ away from the Standard Model expectation.
These measurements indicate that the mechanism of $b\rightarrow c\tau\bar{\nu}$ decay is not identical to that of $b\rightarrow c(\mu/e)\bar{\nu}$.
This charge lepton universality violation is particularly intriguing because these decays occur at tree level in the Standard Model.

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