Skip to main content

Advertisement

Log in

Tests of QCD factorisation in the diffractive production of dijets in deep-inelastic scattering and photoproduction at HERA

  • Regular Article - Experimental Physics
  • Published:
The European Physical Journal C Aims and scope Submit manuscript

Abstract

Measurements are presented of differential dijet cross sections in diffractive photoproduction (Q2<0.01 GeV2) and deep-inelastic scattering processes (DIS, 4<Q2<80 GeV2). The event topology is given by ep→eXY, in which the system X, containing at least two jets, is separated from a leading low-mass baryonic system Y by a large rapidity gap. The dijet cross sections are compared with NLO QCD predictions based on diffractive parton densities previously obtained from a QCD analysis of inclusive diffractive DIS cross sections by H1. In DIS, the dijet data are well described, supporting the validity of QCD factorisation. The diffractive DIS dijet data are more sensitive to the diffractive gluon density at high fractional parton momentum than the measurements of inclusive diffractive DIS. In photoproduction, the predicted dijet cross section has to be multiplied by a factor of approximately 0.5 for both direct and resolved photon interactions to describe the measurements. The ratio of measured dijet cross section to NLO prediction in photoproduction is a factor 0.5±0.1 smaller than the same ratio in DIS. This suppression is the first clear observation of QCD hard scattering factorisation breaking at HERA. The measurements are also compared to the two soft colour neutralisation models SCI and GAL. The SCI model describes diffractive dijet production in DIS but not in photoproduction. The GAL model fails in both kinematic regions.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. J. Collins, Phys. Rev. D 57, 3051 (1998) [Erratum ibid. Phys. Rev. D 61, 019902 (2000)] [hep-ph/9709499]

    Article  ADS  Google Scholar 

  2. H1 Collaboration, C. Adloff et al., Z. Phys. C 76, 613 (1997) [hep-ex/9708016]

    Article  Google Scholar 

  3. H1 Collaboration, A. Aktas et al., Eur. Phys. J. C 48, 715 (2006) [hep-ex/0606004]

    Article  ADS  Google Scholar 

  4. H1 Collaboration, C. Adloff et al., Eur. Phys. J. C 6, 421 (1999) [hep-ex/9808013]

    Article  ADS  Google Scholar 

  5. H1 Collaboration, C. Adloff et al., Eur. Phys. J. C 20, 29 (2001) [hep-ex/0012051]

    ADS  Google Scholar 

  6. CDF Collaboration, T. Affolder et al., Phys. Rev. Lett. 84, 5043 (2000)

    Article  ADS  Google Scholar 

  7. J.D. Bjorken, Phys. Rev. D 47, 101 (1993)

    Article  ADS  Google Scholar 

  8. E. Gotsman, E. Levin, U. Maor, Phys. Lett. B 309, 199 (1993) [hep-ph/9302248]

    Article  ADS  Google Scholar 

  9. E. Gotsman, E. Levin, U. Maor, Phys. Lett. B 438, 229 (1998) [hep-ph/9804404]

    Article  ADS  Google Scholar 

  10. B. Cox, J. Forshaw, L. Lönnblad, JHEP 10, 23 (1999) [hep-ph/9908464]

    Article  ADS  Google Scholar 

  11. A. Kaidalov et al., Phys. Lett. B 567, 61 (2003) [hep-ph/0306134]

    Article  ADS  Google Scholar 

  12. A. Edin, G. Ingelman, J. Rathsman, Phys. Lett. B 366, 371 (1996) [hep-ph/9508386]

    Article  ADS  Google Scholar 

  13. A. Edin, G. Ingelman, J. Rathsman, Z. Phys. C 75, 57 (1997) [hep-ph/9605281]

    Article  Google Scholar 

  14. R. Enberg, G. Ingelman, N. Timneanu, Phys. Rev. D 64, 114015 (2001) [hep-ph/0106246]

    Article  ADS  Google Scholar 

  15. CDF Collaboration, F. Abe et al., Phys. Rev. Lett. 78, 2698 (1997) [hep-ex/9703010]

    Article  ADS  Google Scholar 

  16. CDF Collaboration, T. Affolder et al., Phys. Rev. Lett. 84, 232 (2000)

    Article  ADS  Google Scholar 

  17. CDF Collaboration, F. Abe et al., Phys. Rev. Lett. 79, 2636 (1997)

    Article  ADS  Google Scholar 

  18. D0 Collaboration, B. Abbott et al., Phys. Lett. B 531, 52 (2002) [hep-ex/9912061]

    Article  Google Scholar 

  19. CDF Collaboration, T. Affolder et al., Phys. Rev. Lett. 85, 4215 (2000)

    Article  ADS  Google Scholar 

  20. H1 Collaboration, C. Adloff et al., Phys. Lett. B 520, 191 (2001) [hep-ex/0108047]

    Article  ADS  Google Scholar 

  21. ZEUS Collaboration, S. Chekanov et al., Phys. Lett. B 545, 244 (2002) [hep-ex/0206020]

    Article  ADS  Google Scholar 

  22. ZEUS Collaboration, S. Chekanov et al., Nucl. Phys. B 672, 3 (2003) [hep-ex/0307068]

    Article  ADS  Google Scholar 

  23. H1 Collaboration, A. Aktas et al., Eur. Phys. J. C 50, 1 (2007) [hep-ex/0610076]

    Article  ADS  Google Scholar 

  24. S. Ellis, D. Soper, Phys. Rev. D 48, 3160 (1993) [hep-ph/9305266]

    Article  ADS  Google Scholar 

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

    Article  ADS  Google Scholar 

  26. B. Pötter, Comput. Phys. Commun. 133, 105 (2000) [hep-ph/9911221]

    Article  MATH  ADS  Google Scholar 

  27. M. Klasen, G. Kramer, Phys. Lett. B 366, 385 (1996) [hep-ph/9508337]

    Article  ADS  Google Scholar 

  28. S. Frixione, G. Ridolfi, Nucl. Phys. B 507, 315 (1997) [hep-ph/9707345]

    Article  ADS  Google Scholar 

  29. V. Gribov, L. Lipatov, Sov. J. Nucl. Phys. 15, 438 (1972)

    Google Scholar 

  30. V. Gribov, L. Lipatov, Sov. J. Nucl. Phys. 15, 675 (1972)

    Google Scholar 

  31. Y. Dokshitzer, Sov. Phys. JETP 46, 641 (1977)

    Google Scholar 

  32. G. Altarelli, G. Parisi, Nucl. Phys. B 126, 298 (1977)

    Article  ADS  Google Scholar 

  33. W. Furmanski, R. Petronzio, Z. Phys. C 11, 293 (1982)

    Article  Google Scholar 

  34. S. Catani, M.H. Seymour, Nucl. Phys. B 485, 291 (1997) [Erratum ibid. Nucl. Phys. B 510, 503 (1997)] [hep-ph/9605323]

    Article  ADS  Google Scholar 

  35. F. Hautmann, JHEP 10, 025 (2002) [hep-ph/0209320]

    Article  ADS  Google Scholar 

  36. C. Duprel et al., Comparison of next-to-leading order calculations for jet cross-sections in deep inelastic scattering in: A. Doyle et al. (Eds.), Proc. of the Workshop on Monte Carlo Generators for HERA Physics, DESY-PROC-1999-02, 142 (1999) [hep-ph/9910448]

  37. Z. Nagy, Z. Trocsanyi, Phys. Rev. Lett. 87, 082001 (2001) [hep-ph/0104315]

    Article  ADS  Google Scholar 

  38. D. Graudenz, hep-ph/9710244

  39. B. Pötter, Comput. Phys. Commun. 119, 45 (1999) [hep-ph/9806437]

    Article  ADS  Google Scholar 

  40. E. Mirkes, D. Zeppenfeld, Phys. Lett. B 380, 205 (1996) [hep-ph/9511448]

    Article  ADS  Google Scholar 

  41. E. Mirkes, TTP-97-39 (1997) [hep-ph/9711224]

  42. S. Frixione, Z. Kunszt, A. Signer, Nucl. Phys. B 467, 399 (1996) [hep-ph/9512328]

    Article  ADS  Google Scholar 

  43. S. Frixione, Nucl. Phys. B 507, 295 (1997) [hep-ph/9706545]

    Article  ADS  Google Scholar 

  44. see also http://www.ge.infn.it/∼ridolfi/

  45. H. Jung, Comput. Phys. Commun. 86, 147 (1995), version 2.08 is used

    Article  ADS  Google Scholar 

  46. see also http://www.desy.de/∼jung/rapgap.html

  47. M. Klasen, G. Kramer, Phys. Rev. Lett. 93, 232002 (2004) [hep-ph/0410105]

    Article  ADS  Google Scholar 

  48. M. Klasen, G. Kramer, Eur. Phys. J. C 38, 93 (2004) [hep-ph/0408203]

    Article  ADS  Google Scholar 

  49. M. Glück, E. Reya, A. Vogt, Phys. Rev. D 46, 1973 (1992)

    Article  ADS  Google Scholar 

  50. M. Glück, E. Reya, A. Vogt, Phys. Rev. D 45, 3986 (1992)

    Article  ADS  Google Scholar 

  51. G. Marchesini, et al., Comput. Phys. Commun. 67, 465 (1992)

    Article  ADS  Google Scholar 

  52. G. Corcella, et al., JHEP 01, 010 (2001), version 6.5 is used

    Article  ADS  Google Scholar 

  53. J. Rathsman, Phys. Lett. B 452, 364 (1999) [hep-ph/9812423]

    Article  ADS  Google Scholar 

  54. A. Edin, G. Ingelman, J. Rathsman, Comput. Phys. Commun. 101, 108 (1997) [hep-ph/9605286], version 6.5.1 is used

    Article  ADS  Google Scholar 

  55. T. Sjöstrand et al., Comput. Phys. Commun. 135, 238 (2001) [hep-ph/0010017], version 6.1 is used

    Article  MATH  ADS  Google Scholar 

  56. H.L. Lai et al., Eur. Phys. J. C 12, 375 (2000) [hep-ph/9903282]

    Article  ADS  Google Scholar 

  57. H1 Collaboration, I. Abt et al., Nucl. Instrum. Methods A 386, 310 (1997)

    Article  ADS  Google Scholar 

  58. H1 Collaboration, I. Abt et al., Nucl. Instrum. Methods A 386, 348 (1997)

    Article  ADS  Google Scholar 

  59. H1 SpaCal Group, T. Nicholls et al., Nucl. Instrum. Methods A 374, 149 (1996)

    Article  ADS  Google Scholar 

  60. H1 SpaCal Group, T. Nicholls et al., Nucl. Instrum. Methods A 386, 397 (1997)

    Article  ADS  Google Scholar 

  61. S. Schätzel, Ph.D. Thesis, Univ. Heidelberg, Germany (2004), available from http://www-h1.desy.de/publications/theses_list.html

  62. H1 Collaboration, C. Adloff et al., Z. Phys. C 74, 221 (1997) [hep-ex/9702003]

    Article  Google Scholar 

  63. R. Brun et al., GEANT 3 User’s Guide, 1987, CERN-DD/EE/84-1

  64. H1 Collaboration, C. Adloff et al., Phys. Lett. B 483, 36 (2000) [hep-ex/0003011]

    Article  Google Scholar 

  65. G. Schuler, T. Sjöstrand, Phys. Lett. B 376, 193 (1996) [hep-ph/9601282]

    Article  ADS  Google Scholar 

  66. H1 Collaboration, C. Adloff et al., Eur. Phys. J. C 13, 397 (2000) [hep-ex/9812024]

    Article  ADS  Google Scholar 

  67. M. Bengtsson, T. Sjöstrand, Z. Phys. C 37, 465 (1988)

    Article  Google Scholar 

  68. T. Sjöstrand, Comput. Phys. Commun. 39, 347 (1986)

    Article  ADS  Google Scholar 

  69. T. Sjöstrand, M. Bengtsson, Comput. Phys. Commun. 43, 367 (1987)

    Article  ADS  Google Scholar 

  70. A. Kwiatkowski, H. Spiesberger, H. Möhring, Comput. Phys. Commun. 69, 155 (1992)

    Article  ADS  Google Scholar 

  71. B. List, Diploma Thesis, Techn. Univ. Berlin, Germany, (1993), unpublished

  72. B. List, A. Mastroberardino, DIFFVM: A Monte Carlo Generator for diffractive processes in ep scattering in: A. Doyle et al. (Eds.), Proc. of the Workshop on Monte Carlo Generators for HERA Physics, DESY-PROC-1999-02, 396 (1999)

  73. H1 Collaboration, A. Aktas et al., Eur. Phys. J. C 48, 749 (2006) [hep-ex/0606003]

    Article  ADS  Google Scholar 

  74. F.-P. Schilling, Ph.D. Thesis, Univ. Heidelberg, Germany (2001), available from http://www-h1.desy.de/publications/theses_list.html

  75. ZEUS Collaboration, J. Breitweg et al., Eur. Phys. J. C 1, 81 (1998) [hep-ex/9709021]

    Article  ADS  Google Scholar 

  76. ZEUS Collaboration, J. Breitweg et al., Eur. Phys. J. C 2, 237 (1998) [hep-ex/9712019]

    Article  ADS  Google Scholar 

  77. S. Schenk, Diploma Thesis, Univ. Heidelberg, Germany (2003), available from http://www.physi.uni-heidelberg.de/physi/h1/publications.php

  78. M. Glück, E. Reya, A. Vogt, Z. Phys. C 67, 433 (1995)

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Consortia

Corresponding author

Correspondence to O. Behnke.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Aktas, A., Andreev, V., Anthonis, T. et al. Tests of QCD factorisation in the diffractive production of dijets in deep-inelastic scattering and photoproduction at HERA. Eur. Phys. J. C 51, 549–568 (2007). https://doi.org/10.1140/epjc/s10052-007-0325-4

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1140/epjc/s10052-007-0325-4

Keywords

Navigation