Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-28
JHEP 1010:111,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, 2 figures; version as published in JHEP, title changed, discussion about annihilation in three body final states add
Scientific paper
10.1007/JHEP10(2010)111
Despite being very successful in explaining the wide range of precision experimental results obtained so far, the Standard Model (SM) of elementary particles fails to address two of the greatest observations of the recent decades: tiny but nonzero neutrino masses and the well-known problem of missing mass in the Universe. Typically the new models beyond the SM explain only one of these observations. Instead, in the present article, we take the view that they both point towards the same new extension of the Standard Model. The new particles introduced are responsible simultaneously for neutrino masses and for the dark matter of the Universe. The stability of dark matter and the smallness of neutrino masses are guaranteed by a U(1) global symmetry, broken to a remnant Z_2. The canonical seesaw mechanism is forbidden and neutrino masses emerge at the loop level being further suppressed by the small explicit breaking of the U(1) symmetry. The new particles and interactions are invoked at the electroweak scale and lead to rich phenomenology in colliders, in lepton flavour violating rare decays and in direct and indirect dark matter searches, making the model testable in the coming future.
Farzan Yasaman
Pascoli Silvia
Schmidt Michael A.
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