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, |Uτ4|2, using only the kinematics of semileptonic tau decays, instead of a specific model. Our study suggests that B factories with large data sets, such a Belle and BABAR, may be able to place stringent limits on |Uτ4|2 as low as O(10-7-10-3) when 100MeV≲m4≲1.2GeV, utilizing minimal assumptions regarding the decay modes of heavy neutrinos.
|Original language||English (US)|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Mar 12 2015|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)