Journal article
Search for unstable heavy and excited leptons in e e- collisions at √s = 170-172 GeV
K Ackerstaff, G Alexander, J Allison, N Altekamp, KJ Anderson, S Anderson, S Arcelli, S Asai, D Axen, G Azuelos, AH Ball, E Barberio, RJ Barlow, R Bartoldus, JR Batley, S Baumann, J Bechtluft, C Beeston, T Behnke, AN Bell Show all
European Physical Journal C | Published : 1998
DOI: 10.1007/BF01245797
Abstract
We have searched for unstable neutral and charged heavy leptons, N and L± and for excited states of neutral and charged leptons, ν*, e*, μ*, and τ*, in e+e- collisions at centre-of-mass energies of 170 and 172 GeV using the OPAL detector at LEP. No evidence for their existence was found From the analysis of charged-current decays of pair-produced unstable heavy leptons, and of charged-current and photonic decays of pair-produced excited leptons, lower limits on their masses are derived From the analysis of charged-current and photonic decays of singly-produced excited leptons, upper limits on the ratio of the coupling to the compositeness scale, f/Λ, are determined for masses up to the kinem..
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