Abstract
The current world averages of the ratios \(R_{D^{(*)}}\) are about \(4\sigma \) away from their Standard Model prediction. These measurements indicate towards the violation of lepton flavor universality in \(b\rightarrow c\,l\,\bar{\nu }\) decay. The different new physics operators, which can explain the \(R_{D^{(*)}}\) measurements, have been identified previously. We show that a simultaneous measurement of the polarization fractions of \(\tau \) and \(D^*\) and the angular asymmetries \(A_\mathrm{FB}\) and \(A_\mathrm{LT}\) in \(B\rightarrow D^*\tau \bar{\nu }\) decay can distinguish all the new physics amplitudes and hence uniquely identify the Lorentz structure of new physics.
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Kumbhakar, S., Kumar Alok, A., Kumar, D., Sankar, S.U. (2019). Resolving \(R_D\) and \(R_{D^*}\) Anomalies. In: Giri, A., Mohanta, R. (eds) 16th Conference on Flavor Physics and CP Violation. FPCP 2018. Springer Proceedings in Physics, vol 234. Springer, Cham. https://doi.org/10.1007/978-3-030-29622-3_65
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DOI: https://doi.org/10.1007/978-3-030-29622-3_65
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