Effective-Lagrangian approach to gamma gamma --> WW; I: Couplings and amplitudes

Abstract

We consider the gauge-boson sector of a locally SU(2) x U(1) invariant effective Lagrangian with ten dimension-six operators added to the Lagrangian of the Standard Model. These operators induce anomalous three- and four-gauge-boson couplings and an anomalous gamma gamma H coupling. In the framework of this effective Lagrangian we calculate the helicity amplitudes and differential and total cross sections for the process gamma gamma --> WW at a photon collider. We give relations between different parts of the amplitudes that show which linear combinations of anomalous couplings are measurable in this reaction. The transformation properties of the differential cross section under CP are discussed. We find that three linear combinations of CP conserving and of CP violating couplings can be measured independently of the photon polarisation in gamma gamma --> WW.

arXiv comment29 pages, 11 figures, references added; to appear in EPJC

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Cited by in corpus (5)

• QCD diffractive mechanism of exclusive $W^{+}{W}^{-}$ pair production at high energies
• Lorentz-violating effects on pair production of W bosons in photon collisions
• A FORTRAN code for $\gamma \gamma \to ZZ$ in SM and MSSM
• Production of $W^{+}{W}^{-}$ pairs via ${\gamma }^{\ast }{\gamma }^{\ast }\to W^{+}{W}^{-}$ subprocess with photon transverse momenta
• Effective-Lagrangian approach to gamma gamma --> WW; II: Results and comparison with e+e- --> WW