Search for excited neutrinos in Z decay

, ALEPH Collaboration (1990) Search for excited neutrinos in Z decay. Physics Letters B, 250 (1-2). pp. 172-182. ISSN 0370-2693

Abstract

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.