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Search for composite and exotic fermions at LEP 2
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Journal Article
Search for composite and exotic fermions at LEP 2
1999
Overview
A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminosity of about 48 pb\\(^{-1}\\) at an \\(\\rm e^+e^-\\) centre-of-mass energy of 183 GeV and about 20 pb\\(^{-1}\\) equally shared between the centre-of-mass energies of 172 GeV and 161 GeV. The search for pair-produced new leptons establishes 95% confidence level mass limits in the region between 70 GeV/\\(c^2\\) and 90 GeV/\\(c^2\\), depending on the channel. The search for singly produced excited leptons and quarks establishes upper limits on the ratio of the coupling of the excited fermion to its mass (\\(\\lambda/m_{f^*}\\)) as a function of the mass.
Publisher
Springer Nature B.V,Springer Verlag (Germany)
Subject
