Leptoquark effects on $b\to s\nu \bar{\nu }$ and $B\to K{l}^{+}{l}^{-}$ decay processes

Abstract

We study the rare semileptonic decays of $B$ mesons induced by $b\to s\nu \bar{\nu }$ as well as $b\to s{l}^{+}{l}^{-}$ transitions in the scalar leptoquark model where the leptoquarks transform as $(3,2,7/6)$ and $(3,2,1/6)$ under the standard model gauge group. The leptoquark parameter space is constrained using the most recent experimental results on $\mathrm{Br}(B_s\to {\mu }^{+}{\mu }^{-})$ and $\mathrm{Br}(B_d\to X_s{\mu }^{+}{\mu }^{-})$ processes. Considering only the baryon number conserving leptoquark interactions, we estimate the branching ratios for the exclusive $\bar{B}\to {\bar{K}}^{(\ast )}\nu \bar{\nu }$ and inclusive $B\to X_s\nu \bar{\nu }$ decay processes by using the constraint parameters. We also obtain the low recoil (large lepton invariant mass, i.e., $q^2\sim m_b^2$) predictions for the angular distribution of $\bar{B}\to \bar{K}{l}^{+}{l}^{-}$ process and several other observables including the flat term and lepton flavour non-universality factor in this model.

24 pages, 10 figures, version to appear in New J. Phys

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Cited by in corpus (20)

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