Flavor changing heavy Higgs interactions with leptons at hadron colliders

In a general two Higgs doublet model, we study flavor changing neutral Higgs (FCNH) decays into leptons at hadron colliders, pp→?0→τ?μ±+X, where ?0 could be a CP-even scalar (h0, H0) or a CP-odd pseudoscalar (A0). The light Higgs boson h0 is found to resemble closely the Standard Model Higgs boson at the Large Hadron Collider. In the alignment limit of cos?(β?α)?0 for h0–H0 mixing, FCNH couplings of h0 are naturally suppressed, but such couplings of the heavier H0,A0 are sustained by sin?(β?α)?1. We evaluate physics backgrounds from dominant processes with realistic acceptance cuts and tagging efficiencies. We find promising results for s=14 TeV, which we extend further to s=27 TeV and 100 TeV future pp colliders. ? 2019 The Authors