Lepton Flavor Violating $B\to K^*_2(1430)\mu^{\pm}\tau^{\mp}$ Decays

TL;DR

This paper investigates lepton flavor violating B meson decays involving $K_2^*(1430)$ and muon-tau pairs, calculating angular distributions and branching ratios within a new physics framework motivated by current anomalies.

Contribution

It provides the first detailed analysis of $B o K_2^*(1430) au o ext{muon} ext{-tau}$ decays including angular distributions and branching ratios in a vector leptoquark model.

Findings

Upper limits on branching ratios: $ ot{B}(B o K_2^* au ext{-} ext{muon})$ are established.

Angular distributions and asymmetries are computed in the presence of new physics.

The vector leptoquark model can accommodate current $B$ anomalies.

Abstract

A number of measurements in decays induced by the semileptonic $b\to s$ and $b\to c$ transitions hint towards a possible role of new physics in both sectors. Motivated by these anomalies, we investigate the lepton flavor violating $B\to K^*_2 (1430)\mu^{\pm}\tau^{\mp}$ decays. We calculate the two-fold angular distribution of $B\to K^*_2\ell_1\ell_2$ decay in presence of vector, axial-vector, scalar and pseudo-scalar new physics interactions. We then compute the branching fraction and lepton forward-backward asymmetry in the framework of $U^{2/3}_1$ vector leptoquark which is a viable solution to the current $B$ anomalies. We find that the upper limits are $\mathcal{B}(B\to K^*_2\mu^-\tau^+)\leq 1.64\times 10^{-7}$ and $\mathcal{B}(B\to K^*_2\mu^+\tau^-)\leq 0.60\times 10^{-7}$ at $90\%$ C.L.