Constraints on Large Extra Dimensions with Bulk Neutrinos

Details Constraints on Large Extra Dimensions with Bulk Neutrinos Constraints on Large Extra Dimensions with Bulk Neutrinos

2003-12-24

arxiv.org/abs/hep-ph/0312339v2

Phys.Rev. D69 (2004) 115003

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 4 figures, revtex4. v2: Minor typos corrected, references added

Scientific paper

10.1103/PhysRevD.69.115003

We consider right-handed neutrinos propagating in $\delta$ (large) extra dimensions, whose only coupling to Standard Model fields is the Yukawa coupling to the left-handed neutrino and the Higgs boson. These theories are attractive as they can explain the smallness of the neutrino mass, as has already been shown. We show that if $\delta$ is bigger than two, there are strong constraints on the radius of the extra dimensions, resulting from the experimental limit on the probability of an active state to mix into the large number of sterile Kaluza-Klein states of the bulk neutrino. We also calculate the bounds on the radius resulting from requiring that perturbative unitarity be valid in the theory, in an imagined Higgs-Higgs scattering channel.

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