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Large Mixing of Light and Heavy Neutrinos in Seesaw Models and the LHC · Around

2009

Large Mixing of Light and Heavy Neutrinos in Seesaw Models and the LHC

He, Xiao-Gang, Oh, Sechul, Tandean, Jusak et al.

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In the type-I seesaw model the size of mixing between light and heavy neutrinos, nu and N, respectively, is of order the square root of their mass ratio, (m_nu/m_N)^(1/2), with only one generation of the neutrinos.

Since the light-neutrino mass must be less than an eV or so, the mixing would be very small, even for a heavy-neutrino mass of order a few hundred GeV.
This would make it unlikely to test the model directly at the LHC, as the amplitude for producing the heavy neutrino is proportional to the mixing size.
However, it has been realized for some time that, with more than one generation of light and heavy neutrinos, the mixing can be significantly larger in certain situations.

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