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- W2617083367 abstract "The measurement of $R_D$ ($R_{D^*}$), the ratio of the branching fraction of $overline{B} to D tau bar{nu}_tau (overline{B} to D^* tau bar{nu}_tau)$ to that of $overline{B} to D l bar{nu}_l (overline{B} to D^* l bar{nu}_l)$, shows $1.9 sigma$ $(3.3 sigma)$ deviation from its Standard Model (SM) prediction. The combined deviation is at the level of $4 sigma$ according to the Heavy Flavour Averaging Group (HFAG). We perform an effective field theory analysis (at the dimension 6 level) of these potential New Physics (NP) signals assuming $ SU(3)_{C} times SU(2)_{L} times U(1)_{Y}$ gauge invariance. We first show that, in general, $R_D$ and $R_{D^*}$ are theoretically independent observables and hence, their theoretical predictions are not correlated. We identify the operators that can explain the experimental measurements of $R_D$ and $R_{D^*}$ individually and also together. Motivated by the recent measurement of the $tau$ polarisation in $overline{B} to D^* tau bar{nu}_tau$ decay, $P_tau^{D^*}$ by the {sc Belle} collaboration, we study the impact of a more precise measurement of $P_tau^{D^*}$ (and a measurement of $P_tau^D$) on the various possible NP explanations. Furthermore, we show that the measurement of $R_{D^*}$ in bins of $q^2$, the square of the invariant mass of the lepton neutrino system, along with the information on $tau$ polarisation, can completely distinguish the various operator structures." @default.
- W2617083367 created "2017-06-05" @default.
- W2617083367 creator A5072247551 @default.
- W2617083367 date "2017-05-21" @default.
- W2617083367 modified "2023-09-26" @default.
- W2617083367 title "A Closer Look at $R_D$ and $R_{D^ast}$" @default.
- W2617083367 hasPublicationYear "2017" @default.
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