Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-28
Phys.Rev. D73 (2006) 056001
Physics
High Energy Physics
High Energy Physics - Phenomenology
Corresponds to published version: added subsection VI-D about order-of-magnitude estimates
Scientific paper
10.1103/PhysRevD.73.056001
Following previous work, we identify a symmetry S_nat that generalizes the concept of custodial symmetry, keeping under control deviations from the Standard Model (SM). To realize S_nat linearly, the space of gauge fields has to be extended. Covariant constraints formulated in terms of spurions reduce S_nat back to SU(2)_L x U(1)_Y. This allows for a covariant introduction of explicit S_nat-breaking parameters. We assume that S_nat is at play in a theory of electroweak symmetry-breaking without a light Higgs particle. We describe some consequences of this assumption, using a non-decoupling effective theory in which the loop expansion procedure is based on both momentum and spurion power counting, as in Chiral Perturbation Theory. A hierarchy of lepton-number violating effects follows. Leading corrections to the SM are non-oblique. The effective theory includes stable light right-handed neutrinos, with an unbroken Z_2 symmetry forbidding neutrino Dirac masses. nu_R contribution to dark matter places bounds on their masses.
Hirn Johannes
Stern Jan
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