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Measurement of dijet production at low Q 2 at HERA

  • experimental physics
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Abstract.

Triple differential dijet cross sections in \(e^\pm p\) interactions are presented in the region of photon virtualities 2 < Q 2 < 80 GeV2, inelasticities 0.1 < y < 0.85, jet transverse energies E * T 1 > 7 GeV, E * T 2 > 5 GeV, and pseudorapidities \(-2.5 < \eta^*_1 , \eta^*_2 < 0\). The measurements are made in the \(\gamma^* p\) centre-of-mass frame, using an integrated luminosity of 57 pb-1. The data are compared with NLO QCD calculations and LO Monte Carlo programs with and without a resolved virtual photon contribution. NLO QCD calculations fail to describe the region of low Q 2 and low jet transverse energies, in contrast to a LO Monte Carlo generator which includes direct and resolved photon interactions with both transversely and longitudinally polarised photons. Initial and final state parton showers are tested as a mechanism for including higher order QCD effects in low E T jet production.

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References

  1. C. Adloff et al. [H1 Collaboration], Eur. Phys. J. C 19, 429 (2001) [hep-ex/0010016]; C. Adloff et al. [H1 Collaboration], Phys. Lett. B 515, 17 (2001) [hep-ex/0106078]; C. Adloff et al. [H1 Collaboration], Eur. Phys. J. C 25, 13 (2002) [hep-ex/0201006]; C. Adloff et al. [H1 Collaboration], Eur. Phys. J. C 29, 497 (2003) [hep-ex/0302034]

    Google Scholar 

  2. S. Chekanov et al. [ZEUS Collaboration], Eur. Phys. J. C 23, 13 (2002) [hep-ex/0109029]; S. Chekanov et al. [ZEUS Collaboration], Phys. Lett. B 547, 164 (2002) [hep-ex/0208037]; S. Chekanov et al. [ZEUS Collaboration], Phys. Lett. B 551, 226 (2003) [hep-ex/0210064]; S. Chekanov et al. [ZEUS Collaboration], Phys. Lett. B 560, 7 (2003) [hep-ex/0212064]

    Google Scholar 

  3. A. Aktas et al. [H1 Collaboration], DESY 03-160, submitted to Eur. Phys. J. C [hep-ex/0310019]

  4. C. Adloff et al. [H1 Collaboration], Phys. Lett. B 542, 193 (2002) [hep-ex/0206029]

    Article  Google Scholar 

  5. S. Chekanov et al. [ZEUS Collaboration], Eur. Phys. J. C 23, 615 (2002) [hep-ex/0112029]

    Article  Google Scholar 

  6. C. Adloff et al. [H1 Collaboration], Eur. Phys. J. C 19, 289 (2001) [hep-ex/0010054]

    Google Scholar 

  7. J. Breitweg et al. [ZEUS Collaboration], Phys. Lett. B 479, 37 (2000) [hep-ex/0002010]

    Article  Google Scholar 

  8. J. Breitweg et al. [ZEUS Collaboration], Eur. Phys. J. C 11, 35 (1999) [hep-ex/9905046]

    Article  Google Scholar 

  9. S. Chekanov et al. [ZEUS Collaboration], Eur. Phys. J. C 35, 487 (2004) [hep-ex/0404033]

    Google Scholar 

  10. R. Nisius, Phys. Rept. 332, 165 (2000) [hep-ex/9912049]

    Article  Google Scholar 

  11. M. Krawczyk, A. Zembrzuski, M. Staszel, Phys. Rept. 345, 265 (2001) [hep-ph/0011083]; K. Sasaki, J. Soffer, T. Uematsu, Phys. Rev. D 66, 034014 (2002) [hep-ph/0205159]

    Article  Google Scholar 

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

    Article  Google Scholar 

  13. M. Glück, E. Reya, M. Stratmann, Phys. Rev. D 54, 5515 (1996) [hep-ph/9605297]; M. Glück, E. Reya, I. Schienbein, Phys. Rev. D 60, 054019 (1999) [Erratum-ibid. D 62, 019902 (2000)] [hep-ph/9903337]

    Article  Google Scholar 

  14. G. Kramer, B. Pötter, Eur. Phys. J. C 5, 665 (1998) [hep-ph/9804352]

    Article  Google Scholar 

  15. J. Chýla, M. Taševský, Phys. Rev. D 62, 114025 (2000) [hep-ph/9912514]

    Article  Google Scholar 

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

    Article  Google Scholar 

  17. C. Adloff et al. [H1 Collaboration], Phys. Lett. B 415, 418 (1997) [hep-ex/9709017]

    Article  Google Scholar 

  18. V.N. Gribov, L.N. Lipatov, Yad. Fiz. 15, 781 (1972) [Sov. J. Nucl. Phys. 15, 438 (1972)]; V.N. Gribov, L.N. Lipatov, Yad. Fiz. 15, 1218 (1972) [Sov. J. Nucl. Phys. 15, 675 (1972)]; L.N. Lipatov, Sov. J. Nucl. Phys. 20, 94 (1975) [Yad. Fiz. 20, 181 (1974)]; G. Altarelli, G. Parisi, Nucl. Phys. B 126, 298 (1977); Y.L. Dokshitzer, Sov. Phys. JETP 46, 641 (1977) [Zh. Eksp. Teor. Fiz. 73 1216 (1977)]

    Google Scholar 

  19. J. Chýla, Phys. Lett. B 488, 289 (2000) [hep-ph/0006232]

    Article  Google Scholar 

  20. C. Friberg, T. Sjöstrand, Phys. Lett. B 492, 123 (2000) [hep-ph/0009003]

    Article  Google Scholar 

  21. J. Chýla, M. Taševský, Eur. Phys. J. C 16, 471 (2000) [hep-ph/0003300]; J. Chýla, M. Taševský, Eur. Phys. J. C 18, 723 (2001) [hep-ph/0010254]

    Google Scholar 

  22. K. Sedlák, “Measurement of Dijet Production at Low Q 2 at HERA”, Ph.D. Thesis, Institute of Physics, Academy of Sciences of the Czech Republic, Praha, available from http://www-h1.desy.de/h1/www/publications/theses\_list.html

  23. M. Ciafaloni, Nucl. Phys. B 296, 49 (1988); S. Catani, F. Fiorani, G. Marchesini, Phys. Lett. B 234, 339 (1990); S. Catani, F. Fiorani, G. Marchesini, Nucl. Phys. B 336, 18 (1990); G. Marchesini, Nucl. Phys. B 445, 49 (1995) [hep-ph/9412327]

    Article  Google Scholar 

  24. B. Andersson et al. [Small x Collaboration], Eur. Phys. J. C 25, 77 (2002) [hep-ph/0204115]

    Google Scholar 

  25. H. Jung, L. Jönsson, H. Küster, DESY-98-051, LUNFD6-NFFL-7156-1998, [hep-ph/9805396]; H. Jung, L. Jönsson, H. Küster, Proceedings of Workshop on Photon Interactions and the Photon Structure, p. 229, Lund, Sweden, 10-13 Sep 1998, [hep-ph/9811368]; H. Jung, L. Jönsson, H. Küster, Eur. Phys. J. C 9, 383 (1999) [hep-ph/9903306]

    Article  Google Scholar 

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

    Article  Google Scholar 

  27. H. Jung, Comput. Phys. Commun. 86, 147 (1995)

    Article  Google Scholar 

  28. T. Sjöstrand, Comput. Phys. Commun. 39, 347 (1986); T. Sjöstrand, M. Bengtsson, Comput. Phys. Commun. 43, 367 (1987)

    Article  Google Scholar 

  29. T. Sjöstrand, Comput. Phys. Commun. 82, 74 (1994); T. Sjöstrand, L. Lönnblad, S. Mrenna, [hep-ph/0108264]; T. Sjöstrand et al. , Comput. Phys. Commun. 135, 238 (2001) [hep-ph/0010017]

    Article  Google Scholar 

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

    Article  Google Scholar 

  31. R.K. Ellis, D.A. Ross, A.E. Terrano, Nucl. Phys. B 178, 421 (1981)

    Article  Google Scholar 

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

    Article  Google Scholar 

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

    Article  Google Scholar 

  34. H. Jung, G.P. Salam, Eur. Phys. J. C 19, 351 (2001) [hep-ph/0012143]; H. Jung, Comput. Phys. Commun. 143, 100 (2002) [hep-ph/0109102]

    Google Scholar 

  35. H. Jung, Phys. Rev. D 65, 034015 (2002) [hep-ph/0110034]

    Article  Google Scholar 

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

    Article  Google Scholar 

  37. M. Hansson, H. Jung, Status of CCFM: Un-integrated gluon densities, talk given at the XI Int. Workshop on Deep Inelastic Scattering (DIS 2003), St. Petersburg, Russia 2003, to appear in the proceedings [hep-ph/0309009]

  38. G. Ingelman, A. Edin, J. Rathsman, Comput. Phys. Commun. 101, 108 (1997) [hep-ph/9605286]

    Article  Google Scholar 

  39. I. Abt et al. [H1 Collaboration], Nucl. Instrum. Meth. A 386, 310 (1997); I. Abt et al. [H1 Collaboration], Nucl. Instrum. Meth. A 386, 348 (1997)

    Google Scholar 

  40. J. Bürger et al. , Nucl. Instrum. Meth. A 279, 217 (1989)

    Google Scholar 

  41. B. Andrieu et al. [H1 Calorimeter Group], Nucl. Instrum. Meth. A 336, 460 (1993)

    Google Scholar 

  42. B. Andrieu et al. [H1 Calorimeter Group], Nucl. Instrum. Meth. A 350, 57 (1994); B. Andrieu et al. [H1 Calorimeter Group], Nucl. Instrum. Meth. A 336, 499 (1993)

    Google Scholar 

  43. R.D. Appuhn et al. [H1 SPACAL Group], Nucl. Instrum. Meth. A 386, 397 (1997)

    Google Scholar 

  44. T. Nicholls et al. [H1 SPACAL Group], Nucl. Instrum. Meth. A 374, 149 (1996)

    Google Scholar 

  45. H1 Collaboration, “Technical Proposal for the Upgrade of the Backward Region of the H1 Detector”, DESY internal report PRC-93/02

  46. S.D. Ellis, D.E. Soper, Phys. Rev. D 48, 3160 (1993) [hep-ph/9305266]; S. Catani et al. , Nucl. Phys. B 406, 187 (1993)

    Article  Google Scholar 

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

    Article  Google Scholar 

  48. M. Klasen, G. Kramer, Phys. Lett. B 366, 385 (1996) [hep-ph/9508337]; M. Klasen, G. Kramer, Z. Phys. C 76, 67 (1997) [hep-ph/9611450]; S. Frixione, G. Ridolfi, Nucl. Phys. B 507, 315 (1997) [hep-ph/9707345]

    Article  Google Scholar 

  49. J. Chýla, K. Sedlák, “Dijet cross sections in e p collisions: Who is afraid of symmetric cuts?,” submitted to Phys. Lett. B [hep-ph/0308116]

  50. G. D’Agostini, Nucl. Instrum. Meth. A 362, 487 (1995)

    Article  Google Scholar 

  51. R. Engel, Z. Phys. C 66, 203 (1995); R. Engel, J. Ranft, Phys. Rev. D 54, 4244 (1996) [hep-ph/9509373]

    Google Scholar 

  52. J. Pumplin et al. , JHEP 0207, 012 (2002) [arXiv:hep-ph/0201195]

    Article  Google Scholar 

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

    Article  Google Scholar 

  54. C. Duprel et al. , in “Monte Carlo Generators for HERA Physics” (Hamburg, Germany, 1999), A. Doyle, G. Grindhammer, G. Ingelman, H. Jung, Eds., p. 142, DESY-PROC-1999-02 [hep-ph/9910448]

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Received: 13 January 2004, Revised: 21 July 2004, Published online: 18 August 2004

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The H1 Collaboration. Measurement of dijet production at low Q 2 at HERA. Eur. Phys. J. C 37, 141–159 (2004). https://doi.org/10.1140/epjc/s2004-01989-7

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