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Limits on the Mixing of Tau Neutrino to Heavy Neutrinos

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arxiv hep-ph/0208075 v1 pith:FJF4HVCH submitted 2002-08-07 hep-ph

classification hep-ph
keywords neutrinolimitsheavymixingwerebeamcharmcollaboration
verification ladder T0 review T1 audit T2 compute T3 formal

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Limits at 90 % c.l. on the square of the mixing strength |U_tau4|^2 between nu_tau and a mostly isosinglet heavy neutrino with mass in the range 10-290 MeV/c^2 are reported. The results were derived using the negative result of a search for neutral particles decaying into two electrons conducted by the CHARM collaboration in a neutrino beam dump experiment. Upper limits ~10^-4 were obtained for neutrino masses larger than 160 MeV/c^2.

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