Search For Excited Neutrinos In Z Decay

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PHYSICS LETTERS B（1990）

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摘要

Excited neutrinos decaying into a neutrino and a photon are searched for in the ALEPH detector at LEP. No evidence is found for Z decay into v̄v ∗ or v̄ ∗ v ∗ final states. Upper limits are derived on excited neutrino couplings up to excited neutrino masses close to the Z mass. Lower limits on the v ∗ mass, independent of the v ∗ decay modes, are deduced from the total Z width.

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