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Inside-outside hadronization in a medium

  • B.Z. Kopeliovich
  • J. Nemchik
  • E. Predazzi
  • A. Hayashigaki
Hadrons in the nuclear medium

Abstract.

Nuclei are unique analyzers for the early stage of the space-time development of hadronization. DIS at medium energies is especially suitable for this task being sensitive to hadronization dynamics, since the production length is comparable with the nuclear size. This was the driving motivation to propose an experiment at HERMES [1], and provide predictions based on a pQCD model of hadronization. Now the experiment is done and one can compare the predictions with data [2]. The model successfully describes with no adjustment the nuclear effects for various energies, z h , p T , and Q 2, for different flavors and different nuclei. It turns out that the main source of nuclear suppression of the hadron production rate is attenuation of colorless pre-hadrons in the medium. An alternative model [11] is based upon an unjustified assumption that the struck parton keeps radiating gluons far beyond the nuclear size and the pre-hadron is produced outside the nucleus. This model has apparent problems attempting to explain certain features of the results from HERMES. A good understanding of the hadronization dynamics is important for proper interpretation of the strong suppression of high-p T hadrons observed in heavy ion collisions at RHIC. We demonstrate that the production length is even shorter in this case and keeps contracting with rising p T .

PACS codes.

24.85.+p - Quarks, gluons, and QCD in nuclei and nuclear processes 25.30.Rw - Electroproduction reactions 25.75.Dw - Particle and resonance production 

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References

  1. 1. B.Z. Kopeliovich, J. Nemchik, and E. Predazzi: Proceedings of the workshop on Future Physics at HERA, ed. by G. Ingelman, A. De Roeck and R. Klanner, DESY 1995/1996, v. 2, 1038 (nucl-th/9607036); Proceedings of the ELFE Summer School on Confinement physics, ed. by S.D. Bass and P.A.M. Guichon, Cambridge 1995, Editions Frontieres, p. 391 (hep-ph/9511214)Google Scholar
  2. 2. HERMES Collaboration, A. Airapetian et al.: Eur. Phys. J. C 20, 479 (2001) (hep-ex/0012049); V. Miccifora et al.: Nucl. Phys. A 715, 506 (2003) (hep-ex/0106088); A. Airapetian et al.: hep-ex/0307023Google Scholar
  3. 3. A. Bialas: Acta Phys. Polon. B 11, 475 (1980)Google Scholar
  4. 4. B.Z. Kopeliovich and F. Niedermayer: Sov. J. Nucl. Phys. 42, 504 (1985); Yad. Fiz. 42, 797 (1985)Google Scholar
  5. 5. A. Bialas and J. Czyzewski: Phys. Lett. B 222, 132 (1989)Google Scholar
  6. 6. B.Z. Kopeliovich: Phys. Lett. B 243, 141 (1990)Google Scholar
  7. 7. J. Czyzewski and P. Sawicki: Z. Phys. C 56, 493 (1992)Google Scholar
  8. 8. A. Accardi, V. Muccifora, and H.J. Pirner: Nucl. Phys. A 720, 131 (2003)CrossRefGoogle Scholar
  9. 9. T. Falter, W. Cassing, K. Gallmeister, and U. Mosel: nucl-th/0303011Google Scholar
  10. 10. N.Z. Akopov, G.M. Elbakian, and L.A. Grigoryan: hep-ph/0205123Google Scholar
  11. 11. E. Wang and X.-N. Wang: Phys. Rev. Lett. 89, 162301 (2002)Google Scholar
  12. 12. F. Arleo: Eur. Phys. J. C 30, 213 (2003)Google Scholar
  13. 13. M. Gyulassy and M. Plümer: Nucl. Phys. B 346, 1 (1989)Google Scholar
  14. 14. A. Casher, H. Neubereger, and S. Nussinov: Phys. Rev. D 20, 179 (1979)CrossRefGoogle Scholar
  15. 15. F. Niedermayer: Phys. Rev. D 34, 3494 (1986)Google Scholar
  16. 16. S.J. Brodsky and P. Hoyer: Phys. Lett. 298B, 165 (1993)Google Scholar
  17. 17. R. Baier et al.: Nucl. Phys. B 484, 265 (1997)Google Scholar
  18. 18. J. Dolejsi, J. Hüfner, and B.Z. Kopeliovich: Phys. Lett. B 312, 235 (1993)Google Scholar
  19. 19. M.B. Johnson, B.Z. Kopeliovich, and A.V. Tarasov: Phys. Rev. C 63, 035203 (1991)Google Scholar
  20. 20. M.B. Johnson et al.: Phys. Rev. Lett. 86, 4483 (2001); Phys. Rev. C 65, 025203 (2002)Google Scholar
  21. 21. HERMES Collaboration, A. Airapetian et al.: Phys. Rev. Lett. 90, 052501 (2003)Google Scholar
  22. 22. B.Z. Kopeliovich, J. Nemchik, A. Schäfer, and A.V. Tarasov: Phys. Rev. C 65, 035201 (2002)CrossRefGoogle Scholar
  23. 23. B.Z. Kopeliovich and L.I. Lapidus: in Proc. of the VI Balaton Conference on Nuclear Physics, Balatonfuered, Hungary, 1983, p. 73Google Scholar
  24. 24. A. Bialas and M. Gyulassy: Nucl. Phys. B 291, 793 (1987)Google Scholar
  25. 25. V.T. Kim and B.Z. Kopeliovich: JINR preprint, E2-89-727, Dubna, 1989Google Scholar
  26. 26. B.Z. Kopeliovich, L.B. Litov, and J. Nemchik: J. Mod. Phys. E 4, 767 (1993)Google Scholar
  27. 27. B.Z. Kopeliovich, L.I. Lapidus, and A.B. Zamolodchikov: JETP Lett. 33, 595 (1981)Google Scholar
  28. 28. J. Bertch, S.J. Brodsky, A.S. Goldhaber, and J.G. Gunion: Phys. Rev. Lett. 47, 297 (1981)CrossRefGoogle Scholar
  29. 29. A. Capella et al.: Phys. Rep. 236, 225 (1994); A.B. Kaidalov: JETP Lett. 32, 474 (1980); Sov. J. Nucl. Phys. 33, 733 (1981); Phys. Lett. 116B, 459 (1982)Google Scholar
  30. 30. B.Z. Kopeliovich, I.K. Potashnikova, B. Povh, and E. Predazzi: Phys. Rev. Lett. 85, 507 (2000); Phys. Rev. D 63, 054001 (2001)CrossRefGoogle Scholar
  31. 31. J.F. Gunion and G. Bertsch: Phys. Rev. D 25, 746 (1982)Google Scholar
  32. 32. A.H. Mueller: Nucl. Phys. B 415, 373 (1994)Google Scholar
  33. 33. B. Andersson et al.: Z. Phys. C 49, 79 (1991)Google Scholar
  34. 34. S.R. Amendolia et al.: Phys. Lett. B 178, 435 (1986)Google Scholar
  35. 35. J. Binnewies, B.A. Kniehl, and G. Kramer: Z. Phys. C 65, 471 (1995)Google Scholar
  36. 36. B.A. Kniehl, G. Kramer, and B. Potter: Nucl. Phys. B 597, 337 (2001)CrossRefGoogle Scholar
  37. 37. B.Z. Kopeliovich and B.G. Zakharov: Phys. Rev. D 44, 3466 (1991) Google Scholar
  38. 38. B.Z. Kopeliovich, A. Schäfer, and A.V. Tarasov: Phys. Rev. C 59, 1609 (1999) (extended version in hep-ph/9808378)CrossRefGoogle Scholar
  39. 39. B.Z. Kopeliovich, A. Schäfer, and A.V. Tarasov: Phys. Rev. D 62, 054022 (2000)CrossRefGoogle Scholar
  40. 40. R.P. Feynman and A.R. Gibbs: Quantum Mechanics and Path Integrals, McGRAW–HILL Book Company, New York 1965Google Scholar
  41. 41. B.Z. Kopeliovich, J. Raufeisen and A.V. Tarasov: Phys. Lett. B 440, 151 (1998); Phys. Rev. C 62, 035204 (2000)CrossRefGoogle Scholar
  42. 42. EMC Collaboration, J. Ashman et al.: Z. Phys. C 52, 1 (1991)Google Scholar
  43. 43. L.S. Osborne et al.: Phys. Rev. Lett. 40, 1624 (1978)Google Scholar
  44. 44. N. Pavel: Ph. D. Thesis, WUB 89-24 (1989) WuppertalGoogle Scholar
  45. 45. HERMES Collaboration: preliminary, in http://www-hermes.desy.de/notes/pub/trans-public-subject.html#HADRON-ATTENUATIONGoogle Scholar
  46. 46. J.F. Martin et al.: Phys. Rev. D 20, 5 (1979); J.T. Dakin et al.: Phys. Rev. D 10, 1401 (1974)Google Scholar
  47. 47. W. Brooks: ‘Jefferson Lab experiment E02-104’, talk at the 2d International Conference on Nuclear and Particle Physics by CEBAF at JLAB, May 26-31, 2003, Dubrovnic, CroatiaGoogle Scholar
  48. 48. S. Mioduszewski: High-p T measurements from Phenix, talk at Quark Matter 2002, Long Island, New York, USA (http://www.phenix.bnl.gov/conf_2002.html)Google Scholar
  49. 49. B.Z. Kopeliovich and J. Nemchik: JINR preprint E2-91-150 (1991) DubnaGoogle Scholar
  50. 50. B.Z. Kopeliovich and J. Nemchik: Preprint SANITA INFN-ISS 91/3 Rome, 1991Google Scholar

Copyright information

© Società Italiana di Fisica, Springer-Verlag 2004

Authors and Affiliations

  • B.Z. Kopeliovich
    • 1
    • 2
  • J. Nemchik
    • 3
  • E. Predazzi
    • 4
  • A. Hayashigaki
    • 2
  1. 1.Max-Planck Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany
  2. 2.Institut für Theoretische Physik der Universität, 93040 Regensburg, Germany
  3. 3.Institute of Experimental Physics SAV, Watsonova 47, CS-04353 Kosice, Slovakia
  4. 4.Dipartimento di Fisica Teorica, Università di Torino and INFN, Sezione di Torino, I-10125, Torino, Italy

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