Collider signature of $V_2$ Leptoquark with $b\to s$ flavour observables

Abstract

The Leptoquark model has been instrumental in explaining the observed lepton flavour universality violating charged ($b\to c$) and neutral ($b\to s$) current anomalies that have been the cause for substantial excitement in particle physics recently. In this article we have studied the role of one (designated as $V_2^{\frac{4}{3}}$) of the components of {\boldmath$V_2$} Vector Leptoquark doublet with electromagnetic charge $\frac{4}{3}$ in explaining the neutral current ($b\to s$) anomalies $R_{K^{(\ast )}}$ and $B_s\to {\mu }^{+}{\mu }^{-}$. Moreover, we have performed a thorough collider search for this $V_2^{\frac{4}{3}}$ Leptoquark using $b\bar{b}{\ell }^{+}{\ell }^{-}$ ($\ell \equiv e,\mu$) final state at the Large Hadron Collider. From our collider analysis we maximally exclude the mass of the $V_2^{\frac{4}{3}}$ Leptoquark up to 2340 GeV at 95\% confidence level for the 13 TeV Large Hadron Collider for an integrated luminosity of 3000 ${\mathrm{fb}}^{-1}$. Furthermore, a significant portion of the allowed parameter space that is consistent with the neutral current ($b\to s$) observables is excluded by collider analysis.

Comments: 17 pages, 3 figures, 1 table, some clarifications added, version accepted in Letters in High Energy Physics