Effective-Lagrangian approach to γγ → WW I: Couplings and amplitudes

  • O. NachtmannEmail author
  • F. Nagel
  • M. Pospischil
  • A. Utermann
Theoretical Physics


We consider the gauge-boson sector of a locally SU(2) × 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 γγH coupling. In the framework of this effective Lagrangian we calculate the helicity amplitudes and differential and total cross sections for the process γγ → 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 polarization in γγ → WW.


Field Theory Linear Combination Elementary Particle Quantum Field Theory Total Cross Section 
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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • O. Nachtmann
    • 1
    Email author
  • F. Nagel
    • 1
  • M. Pospischil
    • 1
  • A. Utermann
    • 1
  1. 1.Institut für Theoretische PhysikUniversität HeidelbergHeidelbergGermany

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