Abstract
We investigate the prospects for discovering a top quark decaying into one light Higgs boson ($h^0$) along with a charm quark ($c$) in top quark pair production at the CERN Large Hadron Collider (LHC) and future hadron colliers. A general two Higgs doublet model is adopted to study the signature of flavor changing neutral Higgs (FCNH) interactions with $t \to c h^0$, followed by $h^0 \to WW^* \to \ell^+ \ell^- +\notE_T$, where $h^0$ is the CP-even Higgs boson and $\notE_T$ stands for missing transverse energy from neutrinos. We study the discovery potential for this FCNH signal and physics background from dominant processes with realistic acceptance cuts as well as tagging and mistagging efficiencies. Promising results are found for the LHC running at 13 TeV and 14 TeV center-of-mass energy as well as future pp colliders at 27 TeV and 100 TeV.
Highlights
The Standard Model has been very successful in explaining almost all experimental data to date, culminating in the discovery of the long-awaited standard Higgs boson at the CERN LHC [1,2]
A general two Higgs doublet model (2HDM) usually contains flavor changing neutral Higgs (FCNH) interactions if there is no discrete symmetry to turn off tree-level flavor changing neutral currents (FCNCs) [6,7]
We focus on the discovery potential of the LHC in the search for the FCNH top decay t → ch0 followed by h0 → WWÃ → lþl−νν
Summary
The Standard Model has been very successful in explaining almost all experimental data to date, culminating in the discovery of the long-awaited standard Higgs boson at the CERN LHC [1,2]. The most important experimental goals of the LHC, future high-energy hadron colliders, and the International Linear Collider are to study the Higgs properties and to search for new physics beyond the Standard Model (SM) including additional Higgs bosons and flavor changing neutral Higgs (FCNH) interactions. In the Standard Model, there is one Higgs doublet, which generates masses for both vector bosons and fermions. A general two Higgs doublet model (2HDM) usually contains FCNH interactions if there is no discrete symmetry to turn off tree-level FCNCs [6,7]. The ATLAS Collaboration has placed tight limits on the FCNH branching fraction for t → ch0 and the Yukawa coupling λtch with the Higgs boson decaying into multileptons [34].
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