Advertisement

The European Physical Journal C

, Volume 52, Issue 3, pp 571–579 | Cite as

x-dependence of the quark distribution functions in the χCQMconfig

  • H. Dahiya
  • M. Gupta
Regular Article - Theoretical Physics

Abstract

Chiral constituent quark model with configuration mixing (χCQMconfig) is known to provide a satisfactory explanation of the “proton spin problem” and related issues. In order to enlarge the scope of χCQMconfig, we have attempted to phenomenologically incorporate x-dependence in the quark distribution functions. In particular, apart from calculating valence and sea quark distributions qval(x) and q̄(x), we have carried out a detailed analysis to estimate the sea quark asymmetries d̄(x)-ū(x), d̄(x)/ū(x) and \(\frac{\overline{d}(x)-\overline{u}(x)}{u(x)-d(x)}\) as well as spin independent structure functions F2 p(x)-F2 n(x) and F2 n(x)/F2 p(x) as functions of x. We are able to achieve a satisfactory fit for all the above mentioned quantities simultaneously. The inclusion of effects due to configuration mixing have also been examined in the case F2 p(x)-F2 n(x) and F2 n(x)/F2 p(x) where the valence quark distributions dominate and it is found that it leads to considerable improvement in the results. Further, the valence quark structure has also be tested by extrapolating the predictions of our model in the limit x→1 where data is not available.

Keywords

Valence Quark Quark Distribution E866 Data Quark Distribution Function Valence Structure 
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.
    S. Weinberg, Physica A 96, 327 (1979)CrossRefADSGoogle Scholar
  2. 2.
    A. Manohar, H. Georgi, Nucl. Phys. B 234, 189 (1984)CrossRefADSGoogle Scholar
  3. 3.
    EMC Collaboration, J. Ashman et al., Phys. Lett. B 206, 364 (1988)CrossRefADSGoogle Scholar
  4. 4.
    EMC Collaboration, J. Ashman et al., Nucl. Phys. B 328, 1 (1989)CrossRefADSGoogle Scholar
  5. 5.
    SMC Collaboration, B. Adeva et al., Phys. Lett. B 302, 533 (1993)CrossRefADSGoogle Scholar
  6. 6.
    P. Adams et al., Phys. Rev. D 56, 5330 (1997)CrossRefADSGoogle Scholar
  7. 7.
    E142 Collaboration, P.L. Anthony et al., Phys. Rev. Lett. 71, 959 (1993)CrossRefADSGoogle Scholar
  8. 8.
    E143 Collaboration, K. Abe et al., Phys. Rev. Lett. 75, 391 (1995)Google Scholar
  9. 9.
    New Muon Collaboration, P. Amaudruz et al., Phys. Rev. Lett. 66, 2712 (1991)CrossRefADSGoogle Scholar
  10. 10.
    M. Arneodo et al., Phys. Rev. D 50, R1 (1994)CrossRefADSGoogle Scholar
  11. 11.
    E866/NuSea Collaboration, E.A. Hawker et al., Phys. Rev. Lett. 80, 3715 (1998)CrossRefADSGoogle Scholar
  12. 12.
    J.C. Peng et al., Phys. Rev. D 58, 092004 (1998)CrossRefADSGoogle Scholar
  13. 13.
    R.S. Towell et al., Phys. Rev. D 64, 052002 (2001)CrossRefADSGoogle Scholar
  14. 14.
    K. Gottfried, Phys. Rev. Lett. 18, 1174 (1967)CrossRefADSGoogle Scholar
  15. 15.
    E.J. Eichten, I. Hinchliffe, C. Quigg, Phys. Rev. D 45, 2269 (1992)CrossRefADSGoogle Scholar
  16. 16.
    T.P. Cheng, L.F. Li, Phys. Rev. Lett. 74, 2872 (1995)CrossRefADSGoogle Scholar
  17. 17.
    T.P. Cheng, L.F. Li, hep-ph/9709293Google Scholar
  18. 18.
    T.P. Cheng, L.F. Li, Phys. Rev. D 57, 344 (1998)CrossRefADSGoogle Scholar
  19. 19.
    X. Song, J.S. McCarthy, H.J. Weber, Phys. Rev. D 55, 2624 (1997)CrossRefADSGoogle Scholar
  20. 20.
    X. Song, Phys. Rev. D 57, 4114 (1998)CrossRefADSGoogle Scholar
  21. 21.
    J. Linde, T. Ohlsson, H. Snellman, Phys. Rev. D 57, 452 (1998)CrossRefADSGoogle Scholar
  22. 22.
    T. Ohlsson, H. Snellman, Eur. Phys. J. C 7, 501 (1999)ADSGoogle Scholar
  23. 23.
    H. Dahiya, M. Gupta, Phys. Rev. D 64, 014013 (2001)CrossRefADSGoogle Scholar
  24. 24.
    H. Dahiya, M. Gupta, Phys. Rev. D 66, 051501 (2002)CrossRefADSGoogle Scholar
  25. 25.
    H. Dahiya, M. Gupta, Phys. Rev. D 67, 074001 (2003)CrossRefADSGoogle Scholar
  26. 26.
    H. Dahiya, M. Gupta, Phys. Rev. 67, 114015 (2003)Google Scholar
  27. 27.
    NA51 Collaboration, A. Baldit et al., Phys. Lett. B 253, 252 (1994)Google Scholar
  28. 28.
    HERMES Collaboration, K. Ackerstaff et al., Phys. Rev. Lett. 81, 5519 (1998)CrossRefADSGoogle Scholar
  29. 29.
    J.J. Aubert et al., Nucl. Phys. B 293, 740 (1987)CrossRefADSGoogle Scholar
  30. 30.
    M. Arneodo et al., Phys. Rev. D 50, R1 (1994)CrossRefADSGoogle Scholar
  31. 31.
    A. De Rujula, H. Georgi, S.L. Glashow, Phys. Rev. D 12, 147 (1975)CrossRefADSGoogle Scholar
  32. 32.
    N. Isgur, G. Karl, R. Koniuk, Phys. Rev. Lett. 41, 1269 (1978)CrossRefADSGoogle Scholar
  33. 33.
    N. Isgur, G. Karl, Phys. Rev. D 21, 3175 (1980)CrossRefADSGoogle Scholar
  34. 34.
    N. Isgur et al., Phys. Rev. D 35, 1665 (1987)CrossRefADSGoogle Scholar
  35. 35.
    P. Geiger, N. Isgur, Phys. Rev. D 55, 299 (1997)CrossRefADSGoogle Scholar
  36. 36.
    N. Isgur, Phys. Rev. D 59, 034013 (1999)CrossRefADSGoogle Scholar
  37. 37.
    A. Le Yaouanc, L. Oliver, O. Pene, J.C. Raynal, Phys. Rev. D 12, 2137 (1975)CrossRefADSGoogle Scholar
  38. 38.
    A. Le Yaouanc, L. Oliver, O. Pene, J.C. Raynal, Phys. Rev. D 15, 844 (1977)CrossRefADSGoogle Scholar
  39. 39.
    M. Gupta, A.N. Mitra, Phys. Rev. D 18, 1585 (1978)CrossRefADSGoogle Scholar
  40. 40.
    CDHS Collaboration, H. Abramowicz et al., Z. Phys. C 17, 283 (1983)CrossRefADSGoogle Scholar
  41. 41.
    Costa et al., Nucl. Phys. B 297, 244 (1988)Google Scholar
  42. 42.
    M. Glück, E. Reya, A. Vogt, Z. Phys. C 67, 433 (1995)CrossRefADSGoogle Scholar
  43. 43.
    M. Glück, E. Reya, M. Stratmann, W. Vogelsang, Phys. Rev. D 53, 4775 (1996)CrossRefADSGoogle Scholar
  44. 44.
    H. Weigel, Phys. Rev. D 55, 6910 (1997)CrossRefADSGoogle Scholar
  45. 45.
    M. Wakamatsu, Phys. Rev. D 67, 034005 (2003)CrossRefADSGoogle Scholar
  46. 46.
    A.I. Signal, A.W. Thomas, Phys. Rev. D 40, 2832 (1989)CrossRefADSGoogle Scholar
  47. 47.
    J. Alwall, G. Ingelman, Phys. Rev. D 71, 094015 (2005)CrossRefADSGoogle Scholar
  48. 48.
    L.A. Trevisan, T. Frederico, L. Tomio, Eur. Phys. J. C 11, 351 (1999)ADSGoogle Scholar
  49. 49.
    P.N. Pandit, M.P. Khanna, M. Gupta, J. Phys. G 11, 683 (1985)CrossRefADSGoogle Scholar
  50. 50.
    M. Gupta, N. Kaur, Phys. Rev. D 28, 534 (1983)CrossRefADSGoogle Scholar
  51. 51.
    M. Gupta, J. Phys. G: Nucl. Part. Phys. 16, L213 (1990)CrossRefADSGoogle Scholar
  52. 52.
    A. Le Yaouanc et al., Hadron Transitions in the Quark Model (Gordon and Breach, New York, 1988)Google Scholar
  53. 53.
    J. Grasser, H. Leutwyler, M.E. Saino, Phys. Lett. B 253, 252 (1991)CrossRefADSGoogle Scholar
  54. 54.
    A.O. Bazarko et al., Z. Phys. C 65, 189 (1995)CrossRefADSGoogle Scholar
  55. 55.
    S.J. Dong, J.F. Lagae, K.F. Liu, Phys. Rev. Lett. 75, 2096 (1995)CrossRefADSGoogle Scholar
  56. 56.
    M. Goncharov et al., Phys. Rev. D 64, 112006 (2001)CrossRefADSGoogle Scholar
  57. 57.
    J.D. Bjorken, Phys. Rev. 148, 1467 (1966)CrossRefADSGoogle Scholar
  58. 58.
    J.D. Bjorken, Phys. Rev. D 1, 1376 (1970)CrossRefADSGoogle Scholar
  59. 59.
    J. Ellis, R.L. Jaffe, Phys. Rev. D 9, 1444 (1974)CrossRefADSGoogle Scholar
  60. 60.
    J. Ellis, R.L. Jaffe, Phys. Rev. 10, 1669 (1974)ADSGoogle Scholar
  61. 61.
    M. Gupta, A.N. Mitra, Phys. Rev. D 18, 1585 (1978)CrossRefADSGoogle Scholar
  62. 62.
    N. Isgur, G. Karl, D.W.L. Sprung, Phys. Rev. 23, 163 (1981)ADSGoogle Scholar
  63. 63.
    H. Dahiya, M. Gupta, J.M.S. Rana, Int. J. Mod. Phys. A 21, 4255 (2006)CrossRefADSGoogle Scholar
  64. 64.
    W.-M. Yao et al., J. Phys. G 33, 1 (2006)CrossRefADSGoogle Scholar

Copyright information

© Springer-Verlag / Società Italiana di Fisica 2007

Authors and Affiliations

  1. 1.Department of Physics, Centre of Advanced Study in PhysicsPanjab UniversityChandigarhIndia

Personalised recommendations