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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 1 Issue 1/2 (1998) pp 45-64
experimental physics:
Search for unstable heavy and excited leptons in e$^+$e$^-$ collisions at $\sqrt{s} =$ 170-172 GeV
OPAL Collaboration
, K. Ackerstaff et al. (8)
(8) CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland
Received: 9 September 1997
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.
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Online publication: December 11, 1997
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