### Speaker

### Description

A general two Higgs doublet model (2HDM) is adopted to study the signature of

flavor changing neutral Higgs (FCNH) decay

$\phi^0 \to t\bar{c}+\bar{t}c$ and $\phi^0 \to \tau\mu$, where

$\phi^0$ could be a CP-even scalar ($H^0$) or a CP-odd pseudoscalar ($A^0$)

as well as $t \to c h^0$.

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 $h^0$

approach Standard Model values.

In such limit, FCNH couplings of $h^0$ are naturally

suppressed by a small mixing parameter $\cos(\beta-\alpha)$, while the

off-diagonal couplings of heavier neutral scalars $\phi^0$ are sustained by

$\sin(\beta-\alpha) \sim 1$.

We study physics background from dominant processes with realistic acceptance

cuts and tagging efficiencies. Promising results are found for the LHC running

at 13 or 14 TeV collision energies as well as future pp colliders

at 27 TeV, or 100 TeV.