Abstract
We report on a search for the first generation heavy neutrino that is an isosinglet under the standard SU(2)_L gauge group. The data collected with the L3 detector at center-of-mass energies between 130 GeV and 208 GeV are used.The decay channel N_e --> eW is investigated and no evidence is found for a heavy neutrino, N_e, in a mass range between 80 GeV and 205 GeV. Upper limits on the mixing parameter between the heavy and light neutrino are derived.
Highlights
In the Standard Model of electroweak interactions [1], neutrinos are the only fundamental fermions which do not have a right-handed component that transforms as an isosinglet under the SU(2)L gauge group
Additional heavy isosinglet neutrinos occur in various models that attempt to unify the presently known interactions into a single gauge scheme, such as Grand Unified Theories or Superstring inspired models [2]
Heavy isosinglet neutrinos can couple to the W and Z bosons through their mixing with the light neutrinos
Summary
In the Standard Model of electroweak interactions [1], neutrinos are the only fundamental fermions which do not have a right-handed component that transforms as an isosinglet under the SU(2)L gauge group. Heavy neutrinos were searched for in leptonic decays of mesons and in neutrino beam experiments [4], resulting in stringent upper limits on the square of their mixing amplitude to ordinary neutrinos, |U |2, down to 10−7 in the mass region below 3 GeV.
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