Search for opposite sign muon-tau pair and a b-jet at LHC in the context of flavor anomalies

Abstract

Extant anomalies in several semileptonic $B$-meson decays argue for physics beyond the Standard Model. Measurements of both neutral-current decays (such as $R_K$, $R_{K^{\ast }}$ and $B_s\to \varphi \mu \mu$) as well as charged-current ones- $R(D)$ and $R(D^{\ast })$ -provide strong hints for the violation of lepton flavor universality. Recent studies have shown that a class of effective field theory (EFT) models may explain such anomalies in terms of only a few parameters which can be determined phenomenologically. In this literature, we examine such resolutions in the context of the requisite $(\bar{s}$ $b$)($\bar{\tau }\tau )$ operator, and look for its signals at the 13 TeV LHC, with a final state of one $b$-jet, and an oppositely charged $\mu$-$\tau$ pair, with the muon coming from the decay of one of the $\tau$ leptons. We obtain discovery and exclusion limits on the model parameters as a function of luminosity at the 13 TeV LHC.

Comments: 19 pages, 19 figures, References added, Figures are changed