Measurement of the \(e^ + e^- \rightarrow W^ + W^-\gamma\) cross-section and limits on anomalous quartic gauge couplings with DELPHI

  • The DELPHI Collaboration
experimental physics


\(W^ + W^-\gamma\) production at LEP2 is studied using data collected with the DELPHI detector at centre-of-mass energies between 189 GeV and 209 GeV, corresponding to an integrated luminosity of about 600 pb-1. Cross-sections are measured for the production of W + W- with a hard, central and isolated photon in the final state, and are found to be compatible with the Standard Model prediction. The photon energy spectra are used to derive limits on anomalous contributions to the \(W^ + W^-Z^0\gamma\) and \(W^ + W^-\gamma\gamma\) vertices.


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  1. 1.
    ALEPH, DELPHI, L3 and OPAL Collaborations, the LEP Electroweak Working Group and the SLD Heavy Flavour Group, “A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model”, CERN EP/2002-091, hep-ex/0212036 (2002).Google Scholar
  2. 2.
    G. Bélanger and F. Boudjema, Phys. Lett. B 288, 210 (1992)CrossRefGoogle Scholar
  3. 3.
    A. Denner, S. Dittmaier, M. Roth and D.Wackeroth, Eur. Phys. J. C 20, 201 (2001).Google Scholar
  4. 4.
    L3 Collaboration, P. Achard, Phys. Lett. B 527, 29 (2002).CrossRefGoogle Scholar
  5. 5.
    OPAL Collaboration, G. Abbiendi, Phys. Lett. B 471, 293 (1999).CrossRefGoogle Scholar
  6. 6.
    DELPHI Collaboration, P. Aarnio, Nucl. Instr. and Meth. A 303, 233 (1991).Google Scholar
  7. 7.
    DELPHI Collaboration, P. Abreu, Nucl. Instr. and Meth. A 378, 57 (1996).Google Scholar
  8. 8.
    DELPHI Silicon Tracker group, P. Chochula, Nucl. Instr. and Meth. A 412, 304 (1998).Google Scholar
  9. 9.
    A. Ballestrero, R. Chierici, F. Cossutti and E. Migliore, Comp. Phys. Comm. 152, 175 (2003).CrossRefGoogle Scholar
  10. 10.
    E. Accomando and A. Ballestrero, Comp. Phys. Comm. 99, 270 (1997)CrossRefGoogle Scholar
  11. 11.
    S. Jadach, Comp. Phys. Comm. 140, 432 (2001).MATHGoogle Scholar
  12. 12.
    T. Sjöstrand, Comp. Phys. Comm. 135, 238 (2001).CrossRefGoogle Scholar
  13. 13.
    S. Jadach el al., Comp. Phys. Comm. 76, 361 (1993).CrossRefGoogle Scholar
  14. 14.
    E. Barberio and Z. Was, Comp. Phys. Comm. 79, 291 (1994).CrossRefGoogle Scholar
  15. 15.
    S. Jadach, B.F.L. Ward and Z.Was, Comp. Phys. Comm. 130, 260 (2000).CrossRefMATHGoogle Scholar
  16. 16.
    DELPHI Coll., P. Abreu, Zeit. Phys. C 73, 11 (1996).CrossRefGoogle Scholar
  17. 17.
    W.J. Stirling and A. Werthenbach, Eur. Phys.J. C 14, 103 (2000).CrossRefGoogle Scholar
  18. 18.
    F.A. Berends, R. Pittau and R. Kleiss, Nucl. Phys. B 426, 344 (1994).CrossRefGoogle Scholar
  19. 19.
    W. Beenakker, WW cross-section and distributions, Physics at LEP2, eds. G. Altarelli, T. Sjöstrand and F. Zwirner, CERN 96-01 (1996) Vol 1, 79.Google Scholar
  20. 20.
    DELPHI Collaboration, “Measurement of the W-pair production cross-section and W Branching Ratios in \(e^+e^-\) collisions at \(\sqrt{s}= 161-209\) GeV”, to be submitted to EPJC.Google Scholar
  21. 21.
    The LEP Energy Working Group, A. Blondel, Eur. Phys. J. C 11, 573 (1999).CrossRefGoogle Scholar
  22. 22.
    DELPHI Collaboration, P. Abreu, Phys. Lett. B 491, 67 (2000).CrossRefGoogle Scholar
  23. 23.
    M.W. Grünewald, “LEP2 Monte Carlo Workshop: Report of the Working Groups on Precision Calculations for LEP2 Physics”, CERN 2000-009 (2000), hep-ph/0005309.Google Scholar

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© Springer-Verlag Berlin/Heidelberg 2003

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  • The DELPHI Collaboration

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