The European Physical Journal C

, Volume 52, Issue 1, pp 113–119 | Cite as

String effects on Fermi–Dirac correlation measurements

  • R.M. Durán Delgado
  • G. Gustafson
  • L. LönnbladEmail author
Regular Article - Theoretical Physics


We investigate some recent measurements of Fermi–Dirac correlations by the LEP collaborations indicating surprisingly small source radii for the production of baryons in e+e- annihilation at the Z0 peak. In hadronization models there is besides the Fermi–Dirac correlation effect also a strong dynamical (anti-) correlation. We demonstrate that the extraction of the pure FD effect is highly dependent on a realistic Monte Carlo event generator, both for separation of those dynamical correlations that are not related to Fermi–Dirac statistics, and for corrections of the data and background subtractions. Although the model can be tuned to well reproduce single particle distributions, there are large model uncertainties when it comes to correlations between identical baryons. We therefore, unfortunately, have to conclude that it is at present not possible to draw any firm conclusion about the source radii relevant for baryon production at LEP.


Monte Carlo Gluon Radiation Aleph Collaboration DELPHI Collaboration Hadronization Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    R. Hanbury-Brown, R.Q. Twiss, Nature 178, 1046 (1956)CrossRefADSGoogle Scholar
  2. 2.
    G. Goldhaber, S. Goldhaber, W.-Y. Lee, A. Pais, Phys. Rev. 120, 300 (1960)CrossRefADSGoogle Scholar
  3. 3.
    B. Andersson, W. Hofmann, Phys. Lett. B 169, 364 (1986)CrossRefADSGoogle Scholar
  4. 4.
    B. Andersson, M. Ringner, Nucl. Phys. B 513, 627 (1998) [arXiv:hep-ph/9704383]CrossRefADSGoogle Scholar
  5. 5.
    B. Andersson, G. Gustafson, B. Soderberg, Z. Phys. C 20, 317 (1983)CrossRefGoogle Scholar
  6. 6.
    S. Mohanty, private communicationGoogle Scholar
  7. 7.
    T. Sjöstrand, L. Lönnblad, S. Mrenna, P. Skands, arXiv:hep-ph/0308153Google Scholar
  8. 8.
    T. Sjöstrand, S. Mrenna, P. Skands, JHEP 05, 26 (2006) [arXiv:hep-ph/0603175]CrossRefADSGoogle Scholar
  9. 9.
    K. Hamacher, M. Weierstall, arXiv:hep-ex/9511011Google Scholar
  10. 10.
    OPAL Collaboration, OPAL note PN486 (2001)Google Scholar
  11. 11.
    ALEPH Collaboration, S. Schael et al., Phys. Lett. B 611, 66 (2005)CrossRefADSGoogle Scholar
  12. 12.
    DELPHI Collaboration, M. Kucharczyk, H. Palka, DELPHI note 2004-038 CONF-713 (2004)Google Scholar
  13. 13.
    DELPHI Collaboration, M. Kucharczyk, H. Palka, DELPHI note 2005-010 CONF-730 (2004)Google Scholar
  14. 14.
    ALEPH Collaboration, R. Barate et al., Phys. Lett. B 475, 395 (2000)CrossRefADSGoogle Scholar
  15. 15.
    OPAL Collaboration, G. Alexander et al., Phys. Lett. B 384, 377 (1996)CrossRefADSGoogle Scholar
  16. 16.
    DELPHI Collaboration, T. Lesiak, H. Palka, Prepared for 29th International Conference on High-Energy Physics (ICHEP 98), Vancouver, British Columbia, Canada, 23–29 Jul 1998Google Scholar
  17. 17.
    OPAL Collaboration, G. Abbiendi et al., Eur. Phys. J. C 13, 185 (2000)ADSGoogle Scholar
  18. 18.
    B. Andersson, G. Gustafson, Z. Phys. C 3, 223 (1980)CrossRefGoogle Scholar
  19. 19.
    B. Andersson, G. Gustafson, T. Sjöstrand, Z. Phys. C 6, 235 (1980)CrossRefGoogle Scholar
  20. 20.
    JADE Collaboration, W. Bartel et al., Phys. Lett. B 101, 129 (1981)CrossRefADSGoogle Scholar
  21. 21.
    T. Sjöstrand, Nucl. Phys. B 248, 469 (1984)CrossRefADSGoogle Scholar
  22. 22.
    B. Andersson, G. Gustafson, T. Sjöstrand, Phys. Scripta 32, 574 (1985)CrossRefADSGoogle Scholar
  23. 23.
    P. Eden, G. Gustafson, Z. Phys. C 75, 41 (1997)CrossRefGoogle Scholar
  24. 24.
    T. Sjöstrand, in: R.C. Hwa, G. Pancheri, Y. Srivastava, (eds.), Multiparticle production. Proceedings, Workshop, Perugia, Italy, June 21–28, 1988 (World Scientific, Singapore, 1989), p. 327Google Scholar
  25. 25.
    L. Lönnblad, T. Sjöstrand, Phys. Lett. B 351, 293 (1995)CrossRefADSGoogle Scholar
  26. 26.
    E.A. De Wolf, in: Santiago de Compostela 1992, Proceedings, Multiparticle dynamics, ed. by C. Pajares (World Scientific, Singapore, 1993), pp. 263–274 and Brussels Interuniv. Inst. High Energy – IIHE-92-04 (92/11) 11 p. 303571 (see Conference Index).Google Scholar
  27. 27.
    B. Andersson, G. Gustafson, J. Samuelsson, Z. Phys. C 64, 653 (1994)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag / Società Italiana di Fisica 2007

Authors and Affiliations

  • R.M. Durán Delgado
    • 1
  • G. Gustafson
    • 1
  • L. Lönnblad
    • 1
    Email author
  1. 1.Departement of Theoretical PhysicsLundSweden

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