Search for a Heavy Neutrino in τ Decays at Belle

Le résumé fourni par la source

We report on a search for a heavy Majorana neutrino in the decaysThe results are obtained using the full data sample of 988 fb -1 collected with the Belle detector at the KEKB asymmetric energy e þ e -collider, which contains 912 × 10 6 ττ pairs.We observe no significant signal and set 95% CL upper limits on the couplings of the heavy right-handed neutrinos to the conventional standard model left-handed neutrinos in the mass range 0.2-1.6GeV=c 2 .This is the first study of a mixed couplings of heavy neutrinos to τ leptons and light-flavor leptons.

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