Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-03-30
Phys.Lett. B518 (2001) 276-281
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 2 figures, Revtex style, changed content
Scientific paper
10.1016/S0370-2693(01)01078-4
Working in the context of a proposal for collisional dark matter, we derive bounds on the Higgs boson coupling $g^{\prime}$ to a stable light scalar particle, which we refer to as phion ($\phi$), required to solve problems with small scale structure formation which arise in collisionless dark matter models. We discuss the behaviour of the phion in the early universe for different ranges of its mass. We find that a phion in the mass range of 100 MeV is excluded and that a phion in the mass range of 1 GeV requires a large coupling constant, $g^{\prime} \gsim 2$, and $m_h \lsim 130$ GeV in order to avoid overabundance, in which case the invisible decay mode of the Higgs boson would be dominant.
Bento Maria Conceição
Bertolami Orfeu
Rosenfeld Randall
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