A search for the radiative decay of excited charged leptons, L*, and for radiative and weak decays of excited electron neutrinos, ν*e, is performed, using the 5.8 pb-1 of data collected by ALEPH at 130-140 GeV. No evidence for a signal is found in single or pair production. Excluded mass limits from pair production are close to 65 GeV/c2 for all excited lepton species. Limits on the couplings, λ/mL*, of excited leptons are derived from single production. For an excited lepton mass of 130GeV/c2, these limits are 0.04 GeV-1 for μ* and τ*, and 0.0007 GeV-1 for e*. For ν*e, the limit is at the level of 0.03 GeV-1 for a mass of 120 GeV/c2, independent of the decay branching ratios.
Search for excited leptons at 130–140 GeV
GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
1996-01-01
Abstract
A search for the radiative decay of excited charged leptons, L*, and for radiative and weak decays of excited electron neutrinos, ν*e, is performed, using the 5.8 pb-1 of data collected by ALEPH at 130-140 GeV. No evidence for a signal is found in single or pair production. Excluded mass limits from pair production are close to 65 GeV/c2 for all excited lepton species. Limits on the couplings, λ/mL*, of excited leptons are derived from single production. For an excited lepton mass of 130GeV/c2, these limits are 0.04 GeV-1 for μ* and τ*, and 0.0007 GeV-1 for e*. For ν*e, the limit is at the level of 0.03 GeV-1 for a mass of 120 GeV/c2, independent of the decay branching ratios.Pubblicazioni consigliate
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