Excited Leptonic States in Polarized e^-γand e^+ e^- Collisions

Abstract

We analyze the capability of the next generation of linear electron--positron colliders to unravel the spin and couplings of excited leptons predicted by composite models. Assuming that these machines will be able to operate both in the $e^{+}{e}^{-}$ and $e^{-}\gamma$ modes, we study the effects of the excited electrons of spin $\frac{1}{2}$ and $\frac{3}{2}$ in the reactions $e^{-}\gamma \to e^{-}\gamma$ and $e^{+}{e}^{-}\to \gamma \gamma$. We show how the use of polarized beams is able not only to increase the reach of these machines, but also to determine the spin and couplings of the excited states.

22 pages, RevTeX, 8 figures

References in corpus (1)

• Constraints on spin-3/2 and excited spin-1/2 fermions coming from the leptonic Z0-partial width

Cited by in corpus (9)

• Exclusive excited leptons search in two lepton final states at the CERN-LHC
• Excited muon searches at the FCC based muon-hadron colliders
• Production and decay of single heavy spin-3/2 leptons in high energy electron-positron collisions
• Search for excited electrons through $\gamma \gamma$ scattering
• Higher-spin particles at high-energy colliders
• Bounds on the electromagnetic interactions of excited spin-3/2 leptons
• Discriminating New Physics Scenarios at NLC: The Role of Polarization
• Excited Fermion Contribution to Z Physics at One Loop
• Effect of the excited and fourth generation leptons in lepton flavor violating μ^{-} \to e^{-}2γdecay