Topping-up multilepton plus b-jets anomalies at the LHC with a Z′ boson

During the last years ATLAS and CMS have reported a number of slight to mild discrepancies in signatures multileptons plus $b$-jets analyses such as $t\bar t H$, W^\pm$, Z$ t\bar t$. Among them, recent result on H$ production has also an excess charge asymmetry same-sign dilepton channel with two or more $b$-tagged jets. Motivated by these tantalizing discrepancies, we study phenomenological New Physics model consisting $Z'$ boson that couples up-type quarks via right-handed currents: $t_R\gamma^\mu \bar t_R$, c_R$, $t_R \gamma^\mu u_R$. The latter vertex allows translate at LHC initial state protons final top which, decaying positive lepton $b$-jet, provides crucial contribution some observed discrepancies. Through analysis detector level, select region parameter space our best reproduces data aforementioned study, t$ search. We find better fit experimental than Standard Model for scale approximately $\sim$500 GeV, hierarchical coupling favours quark presence FCNC currents. In order estimate sensitivity this signal, design broadband search featuring many kinematic regions different signal-to-background ratio, perform global analysis. define signal-enhanced observables could further distinguish signal from background. fits analysed be probed significance exceeding 3 standard deviations just full Run-2 dataset.