Inclusive J/ψ photoproduction and polarization at HERA in the k T -factorization approach

Regular Article - Theoretical Physics

Abstract

We investigate the inclusive photoproduction of J/ψ mesons at HERA within the framework of the k T -factorization QCD approach. Our study is based on the color singlet model supplemented with the relevant off-shell matrix elements and the CCFM and KMR unintegrated gluon densities in a proton and in a photon. Both the direct and resolved photon contributions are taken into account. Our predictions are compared with the recent experimental data taken by the H1 and ZEUS collaborations. Special attention is put on the J/ψ polarization parameters λ and ν, which are sensitive to the production dynamics.

Keywords

Transverse Momentum Polarization Parameter Gluon Density ZEUS Collaboration Color Singlet 

References

  1. 1.
    M. Krämer, Prog. Part. Nucl. Phys. 47, 141 (2001) ADSCrossRefGoogle Scholar
  2. 2.
    J.P. Lansberg, Int. J. Mod. Phys. A 21, 3857 (2006) ADSCrossRefGoogle Scholar
  3. 3.
    N. Brambilla et al., CERN-2005-005. arXiv:hep-ph/0412158
  4. 4.
    C.-H. Chang, Nucl. Phys. B 172, 425 (1980) ADSCrossRefGoogle Scholar
  5. 5.
    E.L. Berger, D.L. Jones, Phys. Rev. D 23, 1521 (1981) ADSCrossRefGoogle Scholar
  6. 6.
    R. Baier, R. Rückl, Phys. Lett. B 102, 364 (1981) ADSCrossRefGoogle Scholar
  7. 7.
    S.S. Gershtein, A.K. Likhoded, S.R. Slabospitsky, Sov. J. Nucl. Phys. 34, 128 (1981) Google Scholar
  8. 8.
    E. Braaten, S. Fleming, Phys. Rev. Lett. 74, 3327 (1995) ADSCrossRefGoogle Scholar
  9. 9.
    G. Bodwin, E. Braaten, G. Lepage, Phys. Rev. D 51, 1125 (1995) ADSCrossRefGoogle Scholar
  10. 10.
    G. Bodwin, E. Braaten, G. Lepage, Phys. Rev. D 55, 5853 (1997) ADSCrossRefGoogle Scholar
  11. 11.
    P. Cho, A.K. Leibovich, Phys. Rev. D 53, 150 (1996) ADSCrossRefGoogle Scholar
  12. 12.
    P. Cho, A.K. Leibovich, Phys. Rev. D 53, 6203 (1996) ADSCrossRefGoogle Scholar
  13. 13.
    P. Artoisenet, J. Campbell, J.P. Lansberg, F. Maltoni, F. Tramontano, Phys. Rev. Lett. 101, 152001 (2008) ADSCrossRefGoogle Scholar
  14. 14.
    B. Gong, J.-X. Wang, Phys. Rev. Lett. 100, 232001 (2008) ADSCrossRefGoogle Scholar
  15. 15.
    B. Gong, J.-X. Wang, Phys. Rev. D 78, 074011 (2008) ADSCrossRefGoogle Scholar
  16. 16.
    J.M. Campbell, F. Maltoni, F. Tramontano, Phys. Rev. Lett. 98, 252002 (2007) ADSCrossRefGoogle Scholar
  17. 17.
    P. Artoisenet, J. Campbell, F. Maltoni, F. Tramontano, Phys. Rev. Lett. 102, 142001 (2009) ADSCrossRefGoogle Scholar
  18. 18.
    M. Butenschön, B.A. Kniehl, DESY 10-101. arXiv:1009.5662 [hep-ph]
  19. 19.
    Y.-Q. Ma, K. Wang, K.T. Chao, arXiv:1009.3655 [hep-ph]
  20. 20.
    D. Acosta et al. (CDF Collaboration), Phys. Rev. Lett. 88, 161802 (2002) ADSCrossRefGoogle Scholar
  21. 21.
    V.M. Abazov et al. (D0 Collaboration), Phys. Rev. Lett. 101, 182004 (2008) ADSCrossRefGoogle Scholar
  22. 22.
    L.V. Gribov, E.M. Levin, M.G. Ryskin, Phys. Rep. 100, 1 (1983) ADSCrossRefGoogle Scholar
  23. 23.
    E.M. Levin, M.G. Ryskin, Yu.M. Shabelsky, A.G. Shuvaev, Sov. J. Nucl. Phys. 53, 657 (1991) Google Scholar
  24. 24.
    S. Catani, M. Ciafoloni, F. Hautmann, Nucl. Phys. B 366, 135 (1991) ADSCrossRefGoogle Scholar
  25. 25.
    J.C. Collins, R.K. Ellis, Nucl. Phys. B 360, 3 (1991) ADSCrossRefGoogle Scholar
  26. 26.
    E.A. Kuraev, L.N. Lipatov, V.S. Fadin, Sov. Phys. JETP 44, 443 (1976) ADSGoogle Scholar
  27. 27.
    E.A. Kuraev, L.N. Lipatov, V.S. Fadin, Sov. Phys. JETP 45, 199 (1977) ADSMathSciNetGoogle Scholar
  28. 28.
    I.I. Balitsky, L.N. Lipatov, Sov. J. Nucl. Phys. 28, 822 (1978) Google Scholar
  29. 29.
    M. Ciafaloni, Nucl. Phys. B 296, 49 (1988) ADSCrossRefGoogle Scholar
  30. 30.
    S. Catani, F. Fiorani, G. Marchesini, Phys. Lett. B 234, 339 (1990) ADSCrossRefGoogle Scholar
  31. 31.
    S. Catani, F. Fiorani, G. Marchesini, Nucl. Phys. B 336, 18 (1990) ADSCrossRefGoogle Scholar
  32. 32.
    G. Marchesini, Nucl. Phys. B 445, 49 (1995) ADSCrossRefMathSciNetGoogle Scholar
  33. 33.
    B. Andersson et al. (Small-x Collaboration), Eur. Phys. J. C 25, 77 (2002) ADSCrossRefGoogle Scholar
  34. 34.
    J. Andersen et al. (Small-x Collaboration), Eur. Phys. J. C 35, 67 (2004) ADSCrossRefGoogle Scholar
  35. 35.
    J. Andersen et al. (Small-x Collaboration), Eur. Phys. J. C 48, 53 (2006) ADSCrossRefGoogle Scholar
  36. 36.
    A.V. Lipatov, N.P. Zotov, Eur. Phys. J. C 27, 87 (2003) ADSCrossRefGoogle Scholar
  37. 37.
    S.P. Baranov, N.P. Zotov, J. Phys. G 29, 1395 (2003) ADSCrossRefGoogle Scholar
  38. 38.
    S.P. Baranov, Yad. Fiz. 73, 1 (2010) MathSciNetGoogle Scholar
  39. 39.
    S.P. Baranov, A. Szczurek, Phys. Rev. D 77, 054016 (2008) ADSCrossRefGoogle Scholar
  40. 40.
    S.P. Baranov, Phys. Rev. D 66, 114003 (2002) ADSCrossRefGoogle Scholar
  41. 41.
    S.P. Baranov, Phys. Lett. B 428, 377 (1998) ADSCrossRefGoogle Scholar
  42. 42.
    S. Chekanov et al. (ZEUS Collaboration), J. High Energy Phys. 0912, 007 (2009) Google Scholar
  43. 43.
    F.D. Aaron et al. (H1 Collaboration), DESY 09-225 Google Scholar
  44. 44.
    C. Adloff et al. (H1 Collaboration), Eur. Phys. J. C 25, 25 (2002) ADSCrossRefGoogle Scholar
  45. 45.
    S. Chekanov et al. (ZEUS Collaboration), Eur. Phys. J. C 27, 173 (2003) ADSCrossRefGoogle Scholar
  46. 46.
    M.A. Kimber, A.D. Martin, M.G. Ryskin, Phys. Rev. D 63, 114027 (2001) ADSCrossRefGoogle Scholar
  47. 47.
    G. Watt, A.D. Martin, M.G. Ryskin, Eur. Phys. J. C 31, 73 (2003) ADSCrossRefGoogle Scholar
  48. 48.
    C. Amsler et al. (PDG Collaboration), Phys. Lett. B 667, 1 (2008) CrossRefGoogle Scholar
  49. 49.
  50. 50.
    M. Hansson, H. Jung, L. Jönsson, arXiv:hep-ph/0402019
  51. 51.
    M. Glück, E. Reya, A. Vogt, Phys. Rev. D 46, 1973 (1992) ADSCrossRefGoogle Scholar
  52. 52.
    M. Glück, E. Reya, A. Vogt, Z. Phys. C 67, 433 (1995) ADSCrossRefGoogle Scholar
  53. 53.
    G.P. Lepage, J. Comput. Phys. 27, 192 (1978) ADSMATHCrossRefGoogle Scholar
  54. 54.
    H. Jung, Comput. Phys. Commun. 143, 100 (2002) ADSMATHCrossRefGoogle Scholar
  55. 55.
    H. Jung et al., DESY 10-107 Google Scholar
  56. 56.
    M. Beneke, M. Krämer, M. Vänttinen, Phys. Rev. D 57, 4258 (1998) ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag / Società Italiana di Fisica 2011

Authors and Affiliations

  1. 1.P.N. Lebedev Physics InstituteMoscowRussia
  2. 2.D.V. Skobeltsyn Institute of Nuclear PhysicsM.V. Lomonosov Moscow State UniversityMoscowRussia

Personalised recommendations