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2014

Heavy Neutrinos and the Kinematics of Tau Decays

Kobach, Andrew, Dobbs, Sean

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Searches for heavy neutrinos often rely on the possibility that the heavy neutrinos will decay to detectable particles.

Interpreting the results of such searches requires a particular model for the heavy-neutrino decay.
We present a method for placing limits on the probability that a tau can couple to a heavy neutrino, |U_tau4|^2, using only the kinematics of semi-leptonic tau decays, instead of a specific model.
Our study suggests that B factories with large datasets, such a Belle and BaBar, may be able to place stringent limits on |U_tau4|^2 as low as O(10^-7 - 10^-3) when 100 MeV < m_4 < 1.2 GeV, utilizing minimal assumptions regarding the decay modes of heavy neutrinos.

Heavy Neutrinos and the Kinematics of Tau Decays · Around

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