Advertisement

New NLO parameterizations of the parton distributionsin real photons

  • P. Aurenche
  • M. Fontannaz
  • J. Ph. Guillet
Theoretical Physics

Abstract.

We present new next-to-leading-order (NLO) sets of parton distributions in real photons based on a scheme-invariant definition of the non-perturbative input. We compare the theoretical predictions with LEP data and a best fit allows us to constrain the parameters of the distributions. The shape of the gluon distribution is poorly constrained and we consider the possibility to measure it in photoproduction experiments. Three parameterizations that aim to take into account the scattering of the LEP data are proposed and compared to other NLO parameterizations.

Keywords

Field Theory Elementary Particle Quantum Field Theory Theoretical Prediction Particle Acceleration 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    E. Witten, Nucl. Phys. B 120, 189 (1977)CrossRefGoogle Scholar
  2. 2.
    H. Kolanoski, Springer Tract in Modern Physics 105, 187 (1984); Ch. Berger, W. Wagner, Phys. Rep. C 146, 1 (1987)Google Scholar
  3. 3.
    R. Nisius, Phys. Rep. 332, 165 (2000)CrossRefGoogle Scholar
  4. 4.
    M. Krawczyk, M. Staszel, A. Zembrzuski, Phys. Rep. 345, 265 (2001)CrossRefGoogle Scholar
  5. 5.
    M. Klasen, Rev. Mod. Phys. 74, 1221 (2002)CrossRefGoogle Scholar
  6. 6.
    P. Aurenche, M. Fontannaz, J.Ph. Guillet, Z. Phys. C 64, 621 (1994)CrossRefGoogle Scholar
  7. 7.
    M. Fontannaz, G. Heinrich, Eur. Phys. J. C 34, 191 (2004)CrossRefGoogle Scholar
  8. 8.
    H1 Collaboration, C. Adloff et al. , hep-ex/0302034Google Scholar
  9. 9.
    P. Aurenche et al. , Phys. Lett. B 233, 517 (1989)CrossRefGoogle Scholar
  10. 10.
    M. Glück, E. Reya, I. Schienbein, Phys. Rev. D 60, 054019 (1999), Erratum-ibid. D 62, 019902 (2000); Phys. Rev. D 64, 01750 (2001)CrossRefGoogle Scholar
  11. 11.
    F. Cornet, P. Jankowski, M. Krawczyk, Phys. Rev. D 70, 093004 (2004)CrossRefGoogle Scholar
  12. 12.
    R. De Witt et al. , Phys. Rev. D 19, 2046 (1979); E 20, 1751 (1979)CrossRefGoogle Scholar
  13. 13.
    E.G. Floratos, D.A. Ross, C.T. Sachrajda, Nucl. Phys. B 129, 66 (1977); E B 139, 545 (1978); Nucl. Phys. B 152, 493 (1979)CrossRefGoogle Scholar
  14. 14.
    G. Curci, W. Furmanski, R. Petronzio, Nucl. Phys. B 175, 27 (1980); W. Furmanski, R. Petronzio, Phys. Lett. B 97, 437 (1980)CrossRefGoogle Scholar
  15. 15.
    M. Fontannaz, E. Pilon, Phys. Rev. D 45, 382 (1992)CrossRefGoogle Scholar
  16. 16.
    M. Glück, E. Reya and A. Vogt, Phys. Rev. D 45, 3986 (1992)CrossRefGoogle Scholar
  17. 17.
    NLO FORTRAN codes for large-pT photoproduction reactions can be downloaded from http:/www.lapp.in2p3.frlapthPHOX\_FAMILYmain.htmlGoogle Scholar
  18. 18.
    E.B. Zijlstra, W.L. van Neerven, Nucl. Phys. B 383, 525 (1992)CrossRefGoogle Scholar
  19. 19.
    S. Moch, J.A.M. Vermaseren, A. Vogt, Nucl. Phys. B 621, 413 (2002)CrossRefGoogle Scholar
  20. 20.
    S. Moch, J.A.M. Vermaseren, A. Vogt, Nucl. Phys. B 688, 101 (2004); A. Vogt, S. Moch, J.A.M. Vermaseren, Nucl. Phys. B 691, 129 (2004)CrossRefGoogle Scholar
  21. 21.
    W.A. Bardeen, A.J. Buras, D.W. Duke, T. Muta, Phys. Rev. D 18, 3998 (1978); G. Altarelli, R.K. Ellis, G. Martinelli, Nucl. Phys. B 157, 461 (1979)CrossRefGoogle Scholar
  22. 22.
    W.A. Bardeen, A.J. Buras, Phys. Rev. D 20, 166 (1979); D 21, 2041 (1980)ECrossRefGoogle Scholar
  23. 23.
    M. Glück, E. Reya and A. Vogt, Phys. Rev. D 46, 1973 (1992)CrossRefGoogle Scholar
  24. 24.
    E. Witten, Nucl. Phys. B 104, 445 (1976); C.T. Hill, G.C. Ross, Nucl. Phys. B 148, 373 (1979); M. Glück, E. Reya, Phys. Lett. B 83, 98 (1979)CrossRefGoogle Scholar
  25. 25.
    S. Albino, M. Klasen, S. Söldner-Rembold, Phys. Rev. Lett. 89, 122004 (2002)CrossRefPubMedGoogle Scholar
  26. 26.
    ALEPH Collaboration, A. Heister et al. , Eur. Phys. J. C 30, 145 (2003) CrossRefGoogle Scholar
  27. 27.
    DELPHI Collaboration, preprint DELPHI 2003-025 CONF 645, contributed paper for EPS 2003 (Aachen) and LP 2003 (FNAL)Google Scholar
  28. 28.
    L3 Collaboration, M. Acciarri et al. , Phys. Lett. B 447, 147 (1999)CrossRefGoogle Scholar
  29. 29.
    OPAL Collaboration, G. Abbienchi et al. , Eur. Phys. J. C 18, 15 (2000)CrossRefGoogle Scholar
  30. 30.
    PLUTO Collaboration, Ch. Berger et al. , Phys. Lett. B 142, 111 (1984)CrossRefGoogle Scholar
  31. 31.
    L3 Collaboration, M. Acciarri et al. , Phys. Lett. B 436, 403 (1998)CrossRefGoogle Scholar
  32. 32.
    TPC-2\(\gamma\) Collaboration, H. Aihara et al. , Z. Phys. C 34, 1 (1987)CrossRefGoogle Scholar
  33. 33.
    L3 Collaboration, M. Acciarri et al. , Phys. Lett. B 483, 373 (2000)CrossRefGoogle Scholar
  34. 34.
    AMY Collaboration, Sasaki et al. , Phys. Lett. B 252, 491 (1990)CrossRefGoogle Scholar
  35. 35.
    AMY Collaboration, Sahu et al. , Phys. Lett. B 346, 208 (1995)CrossRefGoogle Scholar
  36. 36.
    AMY Collaboration, Kojima et al. , Phys. Lett. B 400, 395 (1997)CrossRefGoogle Scholar
  37. 37.
    DELPHI Collaboration, Abreu et al. , Zeit. Phys. C 69, 223 (1996)CrossRefGoogle Scholar
  38. 38.
    JADE Collaboration, Bartel et al. , Zeit. Phys. C 24, 231 (1984); Phys. Lett. B 121, 203 (1983)CrossRefGoogle Scholar
  39. 39.
    OPAL Collaboration, Akers et al. , Zeit. Phys. C 61, 199 (1994)CrossRefGoogle Scholar
  40. 40.
    OPAL Collaboration, Ackerstaff et al. , Zeit. Phys. C 74, 33 (1997)CrossRefGoogle Scholar
  41. 41.
    OPAL Collaboration, Ackerstaff et al. , Phys. Lett. B 411, 387 (1997)CrossRefGoogle Scholar
  42. 42.
    OPAL Collaboration, Ackerstaff et al. , Phys. Lett. B 412, 225 (1997)CrossRefGoogle Scholar
  43. 43.
    OPAL Collaboration, Abbiendi et al. , Phys. Lett. B 533, 207 (2002)Google Scholar
  44. 44.
    PLUTO Collaboration, Ch. Berger et al. , Nucl. Phys. B 281, 365 (1987)CrossRefGoogle Scholar
  45. 45.
    TASSO Collaboration, Althoff et al. , Zeit. Phys. C 31, 527 (1986)CrossRefGoogle Scholar
  46. 46.
    TOPAZ Collaboration, Muramatsu et al. , Phys. Lett. B 332, 477 (1994)CrossRefGoogle Scholar
  47. 47.
    M. Fontannaz, J.Ph. Guillet, G. Heinrich, Eur. Phys. J. C 26, 209 (2002)CrossRefGoogle Scholar
  48. 48.
    V. Barone, C. Pascaud, F. Zomer, Eur. Phys. J. C 12, 243 (2000)CrossRefGoogle Scholar
  49. 49.
    CTEQ Collaboration, J. Pumplin et al. , JHEP 0207, 012 (2002)Google Scholar
  50. 50.
    MRST Collaboration, A.D. Martin et al. , Eur. Phys. J C 23, 73 (2002.Google Scholar
  51. 51.
    P. Aurenche, L. Bourhis, M. Fontannaz, J.Ph. Guillet, Eur. Phys. J. C 17, 413 (2000)CrossRefGoogle Scholar
  52. 52.
    OPAL Collaboration, G. Abbiendi et al. , Eur. Phys. J. C 31, 307 (2003)CrossRefGoogle Scholar
  53. 53.
    M. Fontannaz, Eur. Phys. J. C 38, 297 (2004)Google Scholar
  54. 54.
    T. Uematsu and T.F. Walsh, Nucl. Phys. B 199, 93 (1982)CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin/Heidelberg 2005

Authors and Affiliations

  • P. Aurenche
    • 1
  • M. Fontannaz
    • 2
  • J. Ph. Guillet
    • 1
  1. 1.LAPTHUMR 5108 du CNRS associée á l'Université de SavoieAnnecy-le-Vieux CedexFrance
  2. 2.Laboratoire de Physique ThéoriqueUMR 8627 CNRS, Université Paris XIOrsay CedexFrance

Personalised recommendations