# Flavor Changing Heavy Higgs Interactions with Leptons at Hadron Colliders

## TL;DR

This paper investigates flavor-changing neutral Higgs decays into leptons at hadron colliders within a two Higgs doublet model, highlighting potential signals of heavy Higgs bosons at current and future collider energies.

## Contribution

It analyzes flavor-changing Higgs interactions with leptons in a general two Higgs doublet model, focusing on collider signatures and background suppression at various energies.

## Key findings

- Promising detection prospects at 14 TeV collider.
- Extended analysis to 27 TeV and 100 TeV colliders.
- Suppressed FCNH couplings for light Higgs, enhanced for heavy Higgs.

## Abstract

In a general two Higgs doublet model, we study flavor changing neutral Higgs (FCNH) decays into leptons at hadron colliders, $pp \to \phi^0 \to \tau^\mp\mu^\pm +X$, where $\phi^0$ could be a CP-even scalar ($h^0$, $H^0$) or a CP-odd pseudoscalar ($A^0$). The light Higgs boson $h^0$ is found to resemble closely the Standard Model Higgs boson at the Large Hadron Collider. In the alignment limit of $\cos(\beta-\alpha) \cong 0$ for $h^0$--$H^0$ mixing, FCNH couplings of $h^0$ are naturally suppressed, but such couplings of the heavier $H^0, A^0$ are sustained by $\sin(\beta-\alpha) \simeq 1$. We evaluate physics backgrounds from dominant processes with realistic acceptance cuts and tagging efficiencies. We find promising results for $\sqrt{s} = 14$ TeV, which we extend further to $\sqrt{s} = 27$ TeV and 100 TeV future pp colliders.