Effective-Lagrangian approach to γγ → WW I: Couplings and amplitudes
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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.
KeywordsField Theory Linear Combination Elementary Particle Quantum Field Theory Total Cross Section
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- 1.TESLA Technical Design Report Part I: Executive Summary, edited by F. Richard, J.R. Schneider, D. Trines, A. Wagner, DESY, Hamburg, 2001 [hep-ph/0106314]; TESLA Technical Design Report Part III: Physics at an e + e − Linear Collider, edited by R.-D. Heuer, D. Miller, F. Richard, P.M. Zerwas, DESY, Hamburg, 2001 [hep-ph/0106315]Google Scholar
- 2.J.R. Ellis, E. Keil, G. Rolandi, Options for Future Colliders at CERN, CERN-EP-98-03; J.P. Delahaye et al. , CLIC - a Two-Beam Multi-TeV e + e − Linear Collider, in Proceedings of the 20th International Linac Conference LINAC 2000, edited by Alexander W. Chao, eConf C000821, MO201 (2000) [physics/0008064]; CLIC Physics Working Group et al. , Physics at the CLIC Multi-TeV Linear Collider, CERN, Geneva, 2004 [hep-ph/0412251]Google Scholar
- 3.TESLA Technical Design Report, Part VI, Chapter 1: Photon Collider at TESLA, B. Badelek et al. , DESY, Hamburg, 2001 [hep-ex/0108012]Google Scholar
- 4.H. Burkhardt, V. Telnov, CLIC 3-TeV Photon Collider Option, CERN-SL-2002-013-APGoogle Scholar
- 14.W. Menges, A study of charged current triple gauge couplings at TESLA, LC-PHSM-2001-022Google Scholar
- 15.T. Abe et al. [American Linear Collider Working Group Collaboration], in Proceedings of the APS/DPF/DPB Summer Study on the Future of Particle Physics (Snowmass 2001), edited by N. Graf, SLAC-R-570 Resource book for Snowmass 2001, 30 June-21 July 2001, Snowmass, ColoradoGoogle Scholar
- 17.I. Božović-Jelisavčić, K. Mönig, J. Šekarić, Measurement of trilinear gauge couplings at a γγ and eγ collider, hep-ph/0210308; K. Mönig, Electroweak Gauge Theories and Alternative Theories at a Future Linear e + e − Collider, hep-ph/0309021Google Scholar
- 20.I.B. Marfin, V.A. Mossolov, T.V. Shishkina, Anomalous quartic boson couplings via γγ → W + W – and γγ → W + W – Z at the TESLA kinematics, hep-ph/0304250Google Scholar
- 24.A. Bredenstein, S. Dittmaier, M. Roth, Four-fermion production at gamma gamma colliders. II: Radiative corrections in double-pole approximation, hep-ph/0506005Google Scholar
- 28.O. Nachtmann, F. Nagel, M. Pospischil, A. Utermann, Effective-Lagrangian approach to γγ → WW; II: Results and comparison with e + e –, hep-ph/0508133Google Scholar
- 31.O. Nachtmann, Elementary particle physics: Concepts and phenomena (Springer Verlag, Berlin 1990)Google Scholar