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Hidden Higgs Boson at the LHC and Light Dark Matter Searches · Around

2011

Hidden Higgs Boson at the LHC and Light Dark Matter Searches

He, Xiao-Gang, Tandean, Jusak

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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.

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The implications of the invisible Higgs decay in the darkon model or its variants for Higgs searches were discussed before in [ 14 , 26 ] ; M.C. Bento, O. Bertolami, and R. Rosenfeld, Phys. Lett. B 518
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