Semileptonic neutral current decays of ${\Xi }_b$ with dileptons or dineutrinos in the final state

Abstract

We perform a detailed analysis of semileptonic ${\Xi }_b$ decays mediated by flavor-changing neutral currents ($b\to s$ and $b\to d$) with dilepton or dineutrino final states within the perturbative QCD framework. All independent form factors including vector, axial-vector, tensor, and pseudotensor currents are calculated and are used to analyze the decay branching fractions and angular distributions. Our numerical results for the branching fractions of ${\Xi }_b\to \Xi {\ell }^{+}{\ell }^{-}$ decays suggest they are within measurable reach for the LHCb experiment in the near future. Furthermore, we show that a measurement of the ratio $\mathcal{B}({\Xi }_b^{-}\to {\Sigma }^{-}{\mu }^{+}{\mu }^{-})/\mathcal{B}({\Xi }_b^{-}\to {\Xi }^{-}{\mu }^{+}{\mu }^{-})$ will allow for an independent determination of $|V_{td}/V_{ts}|$. For the case of unpolarized ${\Xi }_b$ baryons, we derive several angular observables, which can provide new and complementary constraints on Wilson coefficients in semileptonic FCNC transitions compared to those from mesonic decays. Finally, we present a combined analysis of dilepton and dineutrino channels, comparing various observables in detail. Our results offer further insights into the long-standing anomalies observed in $B$ meson decays.

Matches the version published in Physical Review D

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Cited by in corpus (1)

• ${\Xi }_b\to \Xi$ form factors from lattice QCD and Standard-Model predictions for ${\Xi }_b\to \Xi {\mu }^{+}{\mu }^{-}$ and ${\Xi }_b\to \Xi \gamma$ decays