Abstract
We study possible new physics (NP) effects on Bc→J/ψτν¯, which has been recently measured at LHCb as the ratio of RJ/ψ=B(Bc→J/ψτν¯)/B(Bc→J/ψμν¯). Combining it with the long-standing RD(⁎) measurements, in which the discrepancy with the prediction of the standard model is present, we find possible solutions to the anomaly by several NP types. Then, we see that adding the RJ/ψ measurement does not improve NP fit to data, but the NP scenarios still give better χ2 than the SM. We also investigate indirect NP constraints from the lifetime of Bc and NP predictions on the τ longitudinal polarization in B¯→D⁎τν¯.
Highlights
On recent years, discrepancies with the predictions of the Standard Model (SM) have started to emerge in semitauonic decays of B meson, B → D(∗)τ ν
When we start with the low-energy effective field theory, new physics (NP) effects are described by the four fermion operators of:
We have studied possible NP effects on Bc → J/ψτ νin terms of the effective field theory
Summary
Discrepancies with the predictions of the Standard Model (SM) have started to emerge in semitauonic decays of B meson, B → D(∗)τ ν. NP contributions with nonzero CX from single operators in (2) are possible solutions to the RD(∗) anomaly except for CS1 1, according to the previous studies, e.g., as in Refs. [41, 48, 51].) The V2 scenario requires CV2 to be pure imaginary and Some leptoquark the S2 scenario needs a (LQ) models contribute large to Bnegative CS2 , to → D(∗)τ νwith address the RD(∗) anomaly [13, scalar-tensor operators so that. Has been obtained with dataset of run 1 (3 fb−1) [59, 60] This new measurement enables us to develop explanations for the anomaly with the above NP scenarios, which will be shown in this paper.
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