User menu

Accès à distance ? S'identifier sur le proxy UCLouvain

Measurement of prompt photons with associated jets in photoproduction at HERA

Primary tabs

Piotrzkowski, Krzysztof [UCL] Chekanov, S. de Favereau, J. [UCL]

(eng) The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb-1. Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x_gamma^obs, the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the kT-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the kT-factorisation calculations are in good agreement with the data. Comment: 22 pages, 7 eps figues, 2 tables

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2007
Journal information "European Physical Journal C. Particles and Fields" - Vol. 49, p. 511-522 (2007)
Publisher Springer (Heidelberg)
issn 1434-6044
e-issn 1434-6052
Publication status Publié
Affiliation UCL
Keywords High Energy Physics - Experiment
Links
  1. L.E. Gordon, W. Vogelsang, Phys. Rev. D 52, 58 (1995)
  2. M. Fontannaz, J.P. Guillet, G. Heinrich, Eur. Phys. J. C 21, 303 (2001)
  3. M. Fontannaz, G. Heinrich, Eur. Phys. J. C 34, 191 (2004)
  4. M. Krawczyk, A. Zembrzuski, Phys. Rev. D 64, 14017 (2001)
  5. A. Zembrzuski, M. Krawczyk, preprint hep-ph/0309308, 2003
  6. A.V. Lipatov, N.P. Zotov, Phys. Rev. D 72, 054002 (2005)
  7. ZEUS Collaboration, J. Breitweg et al., Phys. Lett. B 413, 201 (1997)
  8. ZEUS Collaboration, S. Chekanov et al., Phys. Lett. B 511, 19 (2001)
  9. ZEUS Collaboration, J. Breitweg et al., Phys. Lett. B 472, 175 (2000)
  10. H1 Collaboration, A. Aktas et al., Eur. Phys. J. C 38, 437 (2005)
  11. ZEUS Collaboration, U. Holm (ed.), The ZEUS Detector, (Status Report (unpublished), DESY, 1993), available on http://www-zeus.desy.de/bluebook/bluebook.html
  12. N. Harnew et al., Nucl. Instrum. Methods A 279, 290 (1989)
  13. B. Foster et al., Nucl. Phys. Proc. Suppl. B 32, 181 (1993)
  14. B. Foster et al., Nucl. Instrum. Methods A 338, 254 (1994)
  15. M. Derrick et al., Nucl. Instrum. Methods A 309, 77 (1991)
  16. A. Andresen et al., Nucl. Instrum. Methods A 309, 101 (1991)
  17. A. Caldwell et al., Nucl. Instrum. Methods A 321, 356 (1992)
  18. A. Bernstein et al., Nucl. Instrum. Methods A 336, 23 (1993)
  19. J. Andruszków et al., Preprint DESY-92-066, DESY (1992)
  20. ZEUS Collaboration, M. Derrick et al., Z. Phys. C 63, 391 (1994)
  21. J. Andruszków et al., Acta Phys. Pol. B 32, 2025 (2001)
  22. S. Magill, S. Chekanov, Proceedings of the IX Int. Conference on Calorimetry (Annecy, Oct 9–14, 2000), B. Aubert et al. (Ed.), p. 625. Frascati Physics Series 21, Annecy, France (2001)
  23. V.N. Gribov, L.N. Lipatov, Sov. J. Nucl. Phys. 15, 438 (1972)
  24. L.N. Lipatov, Sov. J. Nucl. Phys. 20, 94 (1975)
  25. Y.L. Dokshitzer, Sov. Phys. JETP 46, 641 (1977)
  26. G. Altarelli, G. Parisi, Nucl. Phys. B 126, 298 (1977)
  27. M. Glück, E. Reya, A. Vogt, Z. Phys. C 67, 433 (1995)
  28. M. Glück, E. Reya, A. Vogt, Phys. Rev. D 45, 3986 (1992)
  29. M. Glück, E. Reya, A. Vogt, Phys. Rev. D 46, 1973 (1992)
  30. M. Glück, E. Reya, A. Vogt, Phys. Rev. D 48, 116 (1993)
  31. A.D. Martin et al., Eur. Phys. J. C 14, 133 (2000)
  32. A.D. Martin et al., Eur. Phys. J. C 23, 73 (2002)
  33. P. Aurenche, J.P. Guillet, M. Fontannaz, Z. Phys. C 64, 621 (1994)
  34. E.M. Levin et al., Sov. J. Nucl. Phys. 53, 657 (1991)
  35. S. Catani, M. Ciafaloni, F. Hautmann, Nucl. Phys. B 366, 135 (1991)
  36. J.C. Collins, R.K. Ellis, Nucl. Phys. B 360, 3 (1991)
  37. M.A. Kimber, A.D. Martin, M.G. Ryskin, Phys. Rev. D 63, 114027 (2001)
  38. G. Watt, A.D. Martin, M.G. Ryskin, Eur. Phys. J. C 31, 73 (2003)
  39. S.D. Ellis, D.E. Soper, Phys. Rev. D 48, 3160 (1993)
  40. S. Catani et al., Nucl. Phys. B 406, 187 (1993)
  41. A. Zembrzuski, Private communication
  42. M. Bengtsson, T. Sjöstrand, Comput. Phys. Commun. 46, 43 (1987)
  43. T. Sjöstrand, Comput. Phys. Commun. 82, 74 (1994)
  44. T. Sjöstrand et al., Comput. Phys. Commun. 135, 238 (2001)
  45. G. Marchesini et al., Comput. Phys. Commun. 67, 465 (1992)
  46. G. Corcella et al., JHEP 1, 10 (2001)
  47. CTEQ Collaboration, H.L. Lai et al., Eur. Phys. J. C 12, 375 (2000)
  48. G.A. Schuler, T. Sjöstrand, Phys. Lett. B 376, 193 (1996)
  49. R. Brun et al., Geant3, Technical Report CERN-DD/EE/84-1, CERN, 1987
  50. F. Jacquet, A. Blondel, Proceedings of the Study for an ep Facility for Europe, U. Amaldi (ed.), p. 391. (Hamburg, Germany, 1979). Also in preprint DESY 79/48
  51. G.M. Briskin, Diffractive Dissociation in ep Deep Inelastic Scattering. (Ph.D. Thesis, Tel Aviv University, 1998)
  52. J.E. Huth et al., Research Directions for the Decade. Proceedings of Summer Study on High Energy Physics, 1990, E.L. Berger (Ed.), p. 134. (World Scientific, 1992). Also in preprint FERMILAB-CONF-90-249-E
  53. S. Frixione, G. Ridolfi, Nucl. Phys. B 507, 315 (1997)
  54. M. Fontannaz, J.P. Guillet, G. Heinrich, Eur. Phys. J. C 22, 303 (2001)
  55. ZEUS Collaboration, S. Chekanov et al., Phys. Lett. B 573, 46 (2003)
  56. P.R.B. Saull, A Monte Carlo Generator for Deeply Virtual Compton Scattering at HERA, 1999, available on http://www-zeus.desy.de/physics/diff/pub/MC
Bibliographic reference Piotrzkowski, Krzysztof ; Chekanov, S. ; de Favereau, J. ; et. al. Measurement of prompt photons with associated jets in photoproduction at HERA. In: European Physical Journal C. Particles and Fields, Vol. 49, p. 511-522 (2007)
Permanent URL http://hdl.handle.net/2078/31889