Search for unstable heavy and excited leptons in e+ e- collisions at S**(1/2) = 170-GeV - 172-GeV
Collaboration
42 pages
Published in:
- Eur.Phys.J.C 1 (1998) 45-64
e-Print:
- hep-ex/9709027 [hep-ex]
Report number:
- CERN-PPE-97-123
Experiments:
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Abstract:
We have searched for unstable neutral and charged heavy leptons, N and L^+/-, and for excited states of neutral and charged leptons, nu*, e*, mu* and tau*, 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/Lambda, are determined for masses up to the kinematic limit.- electron positron: colliding beams
- electron positron: annihilation
- new particle: search for
- heavy lepton: pair production
- heavy lepton: excited state
- heavy lepton: decay
- excited state: decay
- charged current
- excited state: radiative decay
- mass: lower limit
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