Search for excited spin-3/2 and spin-1/2 leptons at linear colliders

Abstract

We study the single production of excited spin-3/2 and spin-1/2 leptons in future high energy $e^{+}{e}^{-}$ collisions. We calculate the production cross section and decay widths of excited spin-3/2 and spin-1/2 leptons according to their effective currents. We show that these possible new excited states can be probed up to the mass $m^{\ast }$ ~ $\sqrt{s}$ depending on their couplings to leptons and gauge bosons. We present the angular distributions of final state particles as a measure to discriminate between an excited spin-3/2 and spin-1/2 lepton signal. The signals and the corresponding backgrounds are studied in detail to obtain attainable limits on masses and couplings of excited leptons at future linear colliders

Comments: 20 pages, 8 figures, 5 tables