Abstract
We study the discovery potential of the $cg \to tA\to tZH$ process at the LHC, where $A$ and $H$ are CP-odd and even exotic scalars, respectively. The context is the general Two Higgs Doublet Model, where $cg \to tA$ is induced by the flavor changing neutral Higgs coupling $\rho_{tc}$. We find that the process $cg \to tA\to tZH$ can be discovered for $m_A \sim 400$ GeV, but would likely require high luminosity running of the LHC. Such a discovery would shed light on the mechanism behind the observed Baryon Asymmetry of the Universe. We also study $cg \to tA\to tZh$, where $h$ is the observed 125 GeV scalar, but find it out of reach at the LHC.
Highlights
The discovery of the Higgs boson [1] hð125Þ at the Large Hadron Collider (LHC) confirms the standard model (SM) as the correct theory at the electroweak scale
The Z2 symmetry enforces the up- and downtype quarks to couple to just one scalar doublet, thereby ensuring natural flavor conservation (NFC) [4] and forbids all flavor changing neutral Higgs couplings
We have studied the discovery potential of cg → tA → tZH, tZh processes at the LHC
Summary
The discovery of the Higgs boson [1] hð125Þ at the Large Hadron Collider (LHC) confirms the standard model (SM) as the correct theory at the electroweak scale. The Z2 symmetry enforces the up- and downtype quarks to couple to just one scalar doublet, thereby ensuring natural flavor conservation (NFC) [4] and forbids all flavor changing neutral Higgs couplings This removes the possibility of any additional Yukawa coupling. If ρtt is tiny, gg → A vanishes, and the tZH process is a unique probe of the strongly first order EWPT mechanism, as well as the ρtc driven EWBG scenario. The process can be searched for via pp → tA þ X → tZh þ X, with t → blþνl, Z → lþl−, and h → bb , which we call the tZh process It provides another complementary probe of the ρtc driven EWBG scenario, as well as the cγ mixing angle if ρtt is rather small.
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