Di-jet production in γ γ collisions at LEP2


The production of two high-p T jets in the interactions of quasi-real photons in e + e collisions at \(\sqrt{s_{ee}}\) from 189 GeV to 209 GeV is studied with data corresponding to an integrated e + e luminosity of 550 pb−1. The jets reconstructed by the k -cluster algorithm are defined within the pseudo-rapidity range −1<η<1 and with jet transverse momentum, p T , above 3 GeV/c. The differential di-jet cross-section is measured as a function of the mean transverse momentum \(\overline{p_{T}}\) of the jets and is compared to perturbative QCD calculations.


  1. 1.

    M. Klasen, G. Kramer, Phys. Lett. B 366, 385 (1996)

    Article  ADS  Google Scholar 

  2. 2.

    M. Klasen, Private communication

  3. 3.

    OPAL Collab., G. Abbiendi et al., Eur. Phys. J. C 31, 307 (2003)

    Article  Google Scholar 

  4. 4.

    L3 Collab., P. Achard et al., Phys. Lett. B 602, 157 (2004)

    Article  ADS  Google Scholar 

  5. 5.

    S.D. Ellis, D.E. Soper, Phys. Rev. D 48, 3160 (1993)

    Article  ADS  Google Scholar 

  6. 6.

    S. Catani et al., Nucl. Phys. B 406, 187 (1993)

    Article  ADS  Google Scholar 

  7. 7.

    M. Seymour, Code source http://hepwww.rl.ac.uk/theory/seymour/ktclus

  8. 8.

    L. Lönnblad, M. Seymour (conveners), Section ‘γ γ event generators’, in Physics at LEP2, ed. by G. Altarelli, T. Sjöstrand, F. Zwirner. CERN 96-01 (1996), vol. 2, p. 204

  9. 9.

    DELPHI Collab., P. Aarnio et al., Nucl. Instrum. Methods A 303, 233 (1991)

    Article  Google Scholar 

  10. 10.

    DELPHI Collab., P. Abreu et al., Nucl. Instrum. Methods A 378, 57 (1996)

    Article  ADS  Google Scholar 

  11. 11.

    DELPHI Trigger Group, A. Augustinus et al., Nucl. Instrum. Methods A 515, 782 (2003)

    Article  ADS  Google Scholar 

  12. 12.

    T. Sjöstrand, Comput. Phys. Commun. 82, 74 (1994)

    Article  ADS  Google Scholar 

  13. 13.

    H. Plothow-Besch, Int. J. Mod. Phys. A 10, 2901 (1995)

    Article  ADS  Google Scholar 

  14. 14.

    G.A. Schuler, T. Sjöstrand, Z. Phys. C 68, 607 (1995)

    Article  ADS  Google Scholar 

  15. 15.

    S. Jadach, B.F.L. Ward, Z. Was, Comput. Phys. Commun. 130, 260 (2000)

    MATH  Article  ADS  Google Scholar 

  16. 16.

    F. Berends, P. Daverveldt, R. Kleiss, Comput. Phys. Commun. 40, 271 (1986). Also 285 and 309

    Article  ADS  Google Scholar 

  17. 17.

    H1 Collab., S. Aid et al., Z. Phys. C 70, 17 (1996)

    Article  Google Scholar 

Download references

Author information




Corresponding author

Correspondence to J. Timmermans.

Additional information


Rights and permissions

Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License ( https://creativecommons.org/licenses/by-nc/2.0 ), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Reprints and Permissions

About this article

Cite this article

Abdallah, J., Abreu, P., Adam, W. et al. Di-jet production in γ γ collisions at LEP2. Eur. Phys. J. C 58, 531–541 (2008). https://doi.org/10.1140/epjc/s10052-008-0777-1

Download citation


  • Transverse Momentum
  • Lead Order
  • Multiple Parton Interaction
  • Parton Density Function
  • Hadronisation Correction