Kai-Feng Chen, Wei-Shu Hou, Chung Kao, Masaya Kohda
The Higgs boson h^0 and the top quark t are the two most massive and newest particles ever discovered. If t --> ch^0 occurs at the level of a percent or so, the observed ZZ^* and \gamma\gamma signal events may have accompanying cbW activity coming from t\bar{t} feeddown. A general two Higgs doublet model brings in new ct, cc and tt couplings that modify properties of the light Higgs h^0, and t --> ch^0 can be searched for via h^0 --> ZZ^*, \gamma\gamma, WW^* and b\bar{b} (even \tau^+\tau^-) modes in t\bar{t} events. Existing data might be able to show some clues for t --> ch^0 signature, or should provide important information for B(t --> ch^0) down to below the percent level.
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http://arxiv.org/abs/1304.8037
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