LHC Signatures of Two-Higgs-Doublets with Fourth Family

Abstract

On-going Higgs searches in the light mass window are of vital importance for testing the Higgs mechanism and probing new physics beyond the standard model (SM). The latest ATLAS and CMS searches for the SM Higgs boson at the LHC (7TeV) found some intriguing excesses of events in the γγ/VV^* channels (V=Z,W) around the mass-range of 124-126 GeV. We explore a possible explanation of the γγand VV^* signals from the light CP-odd Higgs A^0 or CP-even Higgs h^0 from the general two-Higgs-doublet model with fourth-family fermions. We demonstrate that by including invisible decays of the Higgs boson A^0 or h^0 to fourth-family neutrinos, the predicted γγand VV^* signals can explain the observed new signatures at the LHC, and will be further probed by the forthcoming LHC runs in 2012.

22pp, 10 Figs, JHEP published version, references added

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• Little Higgs theory confronted with the LHC Higgs data
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• Search for single production of the heavy vectorlike $T$ quark with $T\to th$ and $h\to \gamma \gamma$ at the high-luminosity LHC
• Search for single production of a top quark partner via the $T\to th$ and $h\to W{W}^{\ast }$ channels at the LHC
• Implications on the Heavy CP-even Higgs Boson from Current Higgs Data
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• Search for the Anomalous Interactions of Up-Type Heavy Quarks in $\gamma \gamma$ Collision at the LHC
• Constraints on the quark mixing matrix with vector-like quarks
• The Two Scales of New Physics in Higgs Couplings
• Pair production of the singlet vector-like B quark at the CLIC
• Searching for single production of vectorlike quarks decaying into Wb at a future muon-proton collider