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arXiv · 1109.1277

Hidden Higgs Boson at the LHC and Light Dark Matter Searches

Xiao-Gang He·Jusak Tandean
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Abstract

Recent LHC searches have not found a clear signal of the Higgs boson h of the standard model (SM) with three or four families in the mass range m_h = 120-600 GeV. If the Higgs had an unexpectedly large invisible branching ratio, the excluded m_h regions would shrink. This can be realized in the simplest weakly interacting massive particle dark matter (DM) model, which is the SM plus a real gauge-singlet scalar field D as the DM, via the invisible mode h -> DD. Current data allow this decay to occur for D-mass values near, but below, m_h/2 and those compatible with the light DM hypothesis. For such D masses, h -> DD can dominate the Higgs width depending on m_h, and thus sizable portions of the m_h exclusion zones in the SM with three or four families may be recovered. Increased luminosity at the LHC may even reveal a Higgs having SM-like visible decays still hiding in the presently disallowed regions. The model also accommodates well the new possible DM hints from CRESST-II and will be further tested by improved data from future DM direct searches.

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Xiao-Gang He, Jusak Tandean. 2011-10-27. Hidden Higgs Boson at the LHC and Light Dark Matter Searches. https://doi.org/10.1103/physrevd.84.075018

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