ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract. We have searched for unstable neutral and charged heavy leptons, N and ${\rm L^\pm}$ , and for excited states of neutral and charged leptons, $\nu^*$ , ${\rm e}^*$ , $\mu^*$ and $\tau^*$ , in ${\rm e^+e^-}$ 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, $f/\Lambda$ , are determined for masses up to the kinematic limit.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01245797
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