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2008

Conformal Neutrinos: an Alternative to the See-saw Mechanism

von Gersdorff, Gero, Quiros, Mariano

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We analyze a scenario where the right-handed neutrinos make part of a strongly coupled conformal field theory and acquire an anomalous dimension \gamma<1 at a large scale \Lambda.

Their Yukawa couplings to the Higgs become irrelevant at the fixed point and they are suppressed at low scales giving rise naturally to a small (sub-meV) Dirac neutrino mass which breaks the conformal invariance.
We derive an upper bound on \gamma from loop-induced flavor changing neutral currents.
Neutrino Yukawa couplings can be sizable at electroweak scales and therefore the invisible decay of the Higgs in the neutrino channel can be comparable to the c\bar c and \tau\bar\tau modes and predict interesting Higgs phenomenology.

Conformal Neutrinos: an Alternative to the See-saw Mechanism · Around

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