Volume 77, Number 5, March 2007
|Number of page(s)||5|
|Section||The Physics of Elementary Particles and Fields|
|Published online||19 February 2007|
A seesaw mechanism in the Higgs sector
Service de Physique Théorique - CP 225, Boulevard du Triomphe, B-1050 Brussels, Belgium
Accepted: 7 January 2007
In this paper we revisit the seesaw Higgs mechanism. We show how a seesaw mechanism in a two Higgs doublets model can trigger the electroweak symmetry breaking if at least one of the eigenvalues of the squared-mass matrix is negative. We then consider two special cases of interest. In the decoupling scenario, there is only one scalar degree of freedom in the low-energy regime. In the degenerate scenario, all five degrees of freedom are in the low-energy regime and will lead to observables effects at the LHC. Furthermore, in that scenario, it is possible to impose a discrete symmetry between the doublets that makes the extra neutral degrees of freedom stable. These are thus viable dark-matter candidates. We find an interesting relation between the electroweak-symmetry-breaking mechanism and dark matter.
PACS: 11.15.Ex – Spontaneous breaking of gauge symmetries / 12.60.Fr – Extensions of electroweak Higgs sector / 95.35.+d – Dark matter (stellar, interstellar, galactic, and cosmological)
© Europhysics Letters Association, 2007
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