Study of double-tagged γγ events at LEPII

  • The DELPHI Collaboration
Experimental Physics


Double-tagged interactions of photons with virtualities Q2 between 10 GeV2 and 200 GeV2 are studied with the data collected by DELPHI at LEPII from 1998 to 2000, corresponding to an integrated luminosity of 550 pb-1. The γ*γ*→μ+μ- data agree with QED predictions. The cross-section of the reaction γ*γ*hadrons is measured and compared to the LO and NLO BFKL calculations.


Field Theory Elementary Particle Quantum Field Theory BFKL Calculation 
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  1. 1.
    DELPHI Collab., P. Aarnio et al., Nucl. Instrum. Methods A 303, 233 (1991); DELPHI Collab., P. Abreu et al., Nucl. Instrum. Methods A 378, 57 (1996)CrossRefADSGoogle Scholar
  2. 2.
    H.G. Dosch, T. Gousset, H.J. Pirner, Phys. Rev. D 57, 1666 (1998)CrossRefADSGoogle Scholar
  3. 3.
    E.A. Kuraev, L.N. Lipatov, V.S. Fadin, Sov. Phys. JETP 45, 199 (1977); Y.Y. Balitski, L.N. Lipatov, Sov. J. Nucl. Phys. 28, 822 (1978)MathSciNetGoogle Scholar
  4. 4.
    DELPHI STIC Collab., S.J. Alvsvaag et al., Nucl. Instrum. Methods A 425, 106 (1999)CrossRefGoogle Scholar
  5. 5.
    DELPHI Trigger Group, A. Augustinus et al., Nucl. Instrum. Methods A 515, 782 (2003)CrossRefGoogle Scholar
  6. 6.
    F. Berends, P. Daverveldt, R. Kleiss, Comput. Phys. Commun. 40, 271, 285, 309 (1986)CrossRefADSGoogle Scholar
  7. 7.
    TWOGAM event generator, T. Alderweireld et al., CERN Report 2000-009, edited by G. Passarino, R. Pittau, S. Jadach, (2000), p. 219Google Scholar
  8. 8.
    T. Sjöstrand, Comput. Phys. Commun. 82, 74 (1994)CrossRefADSGoogle Scholar
  9. 9.
    S. Jadach, B.F.L. Ward, Z. Was, Comput. Phys. Commun. 130, 260 (2000)zbMATHCrossRefADSGoogle Scholar
  10. 10.
    V.M. Budnev, I.F. Ginzburg, G.V. Meledin, V.G. Serbo, Phys. Rep. 15, 181 (1975)CrossRefADSGoogle Scholar
  11. 11.
    S.J. Brodsky, F. Hautmann, D.E. Soper, Phys. Rev. D 56, 6957 (1997)CrossRefADSGoogle Scholar
  12. 12.
    J. Bartels, C. Ewerz, R. Staritzbichler, Phys. Lett. B 492, 56 (2000); C. Ewerz, private communicationCrossRefADSGoogle Scholar
  13. 13.
    V.T. Kim, L.N. Lipatov, G.B. Pivovarov, The next-to-leading BFKL pomeron with optimal renormalization. In: Proceeding of the International Conference on elastic and diffractive scattering 1999, Protvino, Russia, edited by V.A. Petrov, A.V. Prokudin, World Sci., Singapore (2000), p. 237, [hep-p/9911228]; V. Kim, private communicationGoogle Scholar
  14. 14.
    ALEPH Collab., A. Heister et al., CERN-EP/2003-025; hep-ex0305107; L3 Collab., P. Achard et al., Phys. Lett. B 531, 39 (2002); OPAL Collab., G. Abbiendi et al., Eur. Phys. J. C 24, 17 (2002)CrossRefGoogle Scholar

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© Springer-Verlag 2006

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  • The DELPHI Collaboration

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