$D^*$ polarization as a probe to discriminate new physics in $\bar{B} \to D^* \tau \bar{\nu}$
S. Uma Sankar*,
A. Kumar Alok,
D. Kumar and
S. Kubhakar*: corresponding author
Pre-published on:
January 29, 2018
Published on:
March 20, 2018
Abstract
We study methods of distinguishing the new physics operators which
provide a good fit to the excess measured value of $R_{D^*}$. Among the
angular observables, we find that the $D^*$ polarization fraction
$f_L(q^2)$ is a good discriminant of scalar and tensor new physics operators.
The change in $\langle f_L (q^2) \rangle$, induced by scalar and tensor
operators, is about three times larger than the expected uncertainty in
the upcoming Belle measurement.
DOI: https://doi.org/10.22323/1.314.0675
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