2018-06-14  P7F

Flavor Changing Neutral Higgs Interactions with Top and Tau at Hadron Colliders

Chung Kao

A general two Higgs doublet model (2HDM) is adopted to study the signature of flavor changing neutral Higgs (FCNH) decays $phi^0 o tc$  and $phi^0 o aumu$ as well as FCNH top decay as well as the FCNH top decay $t o ch^0$, where $phi^0$ could be a CP-even scalar ($H^0$) or a CP-odd pseudoscalar ($A^0$). Measurement of the light 125 GeV neutral Higgs boson ($h^0$) couplings at the Large Hadron Collider (LHC) favor the decoupling limit or the alignment limit of a 2HDM, in which gauge boson and diagonal fermion couplings of the light Higgs boson ($h^0$) approach Standard Model values. In this limit, FCNH couplings of $h^0$ are naturally suppressed by a small mixing parameter $cos(eta-alpha)$, while the off-diagonal couplings of heavier neutral scalars $phi^0$ are sustained by $sin(eta-alpha) sim 1$. We study the FCNH discovery potential with physics background from dominant processes with realistic acceptance cuts and tagging efficiencies. Promising results are found for the LHC running at 13 and 14 TeV collision energies as well as future pp colliders at 27 TeV and 100 TeV.