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.

arXiv comment22pp, 10 Figs, JHEP published version, references added

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