Baryon Resonances in the Double Pion Channel at Jefferson Lab (CEBAF): Experimental and Physical Analysis Status and Perspectives

  • M. Ripani
Part of the Few-Body Systems book series (FEWBODY, volume 11)


The excited baryons made from light quarks are known to decay in single meson as well as in multimeson final states. In particular, the double pion production is sensitive to many excited states of proton and neutron. Quark models predict such decays and also that some resonances could decouple from single meson channels and appear predominantly in multipion production reactions via electromagnetic excitation: the so called “missing resonances”. These issues are part of the CLAS collaboration scientific program at Jefferson Laboratory, where the reaction eNe′ N ππ is being used in the mass region between threshold and 2.2 GeV to investigate baryon resonances and test quark models. In this contribution I will present a framework for the physical interpretation of the data, especially focusing on the approach developed by the Genova-Moscow collaboration. Some very preliminary raw mass distributions collected with CLAS are then shown.


Quark Model Invariant Mass Distribution Pion Production Baryon Resonance Partial Wave Expansion 
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  1. 1.
    F.E. Close: An Introduction to Quarks and Partons, Academic Press, 1979Google Scholar
  2. 2.
    M.M. Giannini: Rep. Prog. Phys. 54, 453 (1990)ADSCrossRefGoogle Scholar
  3. 3a.
    R. Koniuk and N. Isgur: Phys. Rev. Lett. 44, 845 (1980)ADSCrossRefGoogle Scholar
  4. 3b.
    R. Koniuk and N. Isgur: Phys. Rev. D21, 1868 (1980)ADSGoogle Scholar
  5. 4.
    R. Koniuk: Nucl. Phys. B195, 452 (1982)ADSCrossRefGoogle Scholar
  6. 5.
    F. Stancu and P. Stassart: Phys. Rev. D47, 2140 (1993)ADSGoogle Scholar
  7. 6.
    S. Capstick, W. Roberts: Phys. Rev. D49, 4570 (1994)ADSGoogle Scholar
  8. 7.
    S. Capstick: In these ProceedingsGoogle Scholar
  9. 8.
    K.F. Liu and C.W. Wong: Phys. Rev. D28, 170 (1983)ADSGoogle Scholar
  10. 9.
    J.J. Domingo: Proc. 5th Workshop on Perspectives in Nuclear Physics at Intermediate Energies, Trieste, Italy, May 6–10, 1991, eds. S. Boffi, C. Ciofi degli Atti and M. Giannini, (World Scientific, 1992) p. 260Google Scholar
  11. 10.
    V.D. Burkert: Nucl. Phys. A623 (1997) 59cADSGoogle Scholar
  12. 11.
    J. Napolitano et al.: CEBAF Experiment E-93-033; M. Ripani, V. Burkert et al.: CEBAF Experiment E-93-006Google Scholar
  13. 12a.
    Cambridge Bubble Chamber Group: Phys. Rev. 155, 1477 (1967)ADSCrossRefGoogle Scholar
  14. 12b.
    ABB-HHM Collaboration: Phys. Rev. 175, 1669 (1968);ADSCrossRefGoogle Scholar
  15. 12b.
    D. Lüke and P. Söding: Springer Tracts in Mod. Phys. 59 (1971)Google Scholar
  16. 13.
    A. Piazza et al.: Lett, al Nuovo Cim., 12, 403 (1970)CrossRefGoogle Scholar
  17. 14a.
    V. Eckart et al.: Nucl. Phys. B55, 45 (1973);ADSCrossRefGoogle Scholar
  18. 14b.
    P. Joos et al.: Phys. Lett. B52, 481 (1974);ADSGoogle Scholar
  19. 14c.
    K. Wacker et al.: Nucl. Phys. B144, 269 (1978)ADSCrossRefGoogle Scholar
  20. 15.
    A. Braghieri et al: Phys. Lett. B363, 46 (1995)ADSGoogle Scholar
  21. 16.
    B. Krusche: In these ProceedingsGoogle Scholar
  22. 17.
    F.J. Klein: Bonn University thesis BONN-IR-96-08Google Scholar
  23. 18.
    Particle Data Group: Phys. Rev. D54, 1 (1996)Google Scholar
  24. 19.
    Byckling and Kajantie, Particle kinematics, Wiley and Sons (1973)Google Scholar
  25. 20.
    H.M. Pilkuhn: Relativistic Particle Physics, Springer Verlag (1979)Google Scholar
  26. 21.
    D.M. Manley et al.: Phys. Rev. D30, 904 (1984)ADSGoogle Scholar
  27. 22.
    N. Mukhopadhyay: In these ProceedingsGoogle Scholar
  28. 23.
    F.A. Berens, A. Donnachie: Nucl. Phys. B84, 342 (1975)ADSCrossRefGoogle Scholar
  29. 24.
    R.A. Arndt, I.I. Strakovsky, R.L. Workman: Phys. Rev. C53, 430 (1996)ADSGoogle Scholar
  30. 25.
    M. Jacob and G.C. Wick: Ann. of Phys. 7, 404 (1959)MathSciNetADSMATHCrossRefGoogle Scholar
  31. 26.
    V. Mokeev: In these ProceedingsGoogle Scholar
  32. 27.
    A. Bartl, W. Majerotto, D. Schildknecht: Nuovo Cim. 12A, 703 (1972)ADSCrossRefGoogle Scholar
  33. 28a.
    J.A. Gomez-Tejedor and E. Oset: Nucl. Phys. A571, 667 (1994);ADSGoogle Scholar
  34. 28b.
    J.A. Gomez-Tejedor and E. Oset: Nucl. Phys. A600, 413 (1996);ADSGoogle Scholar
  35. 28c.
    E. Oset: In these Proceedings;Google Scholar
  36. 29.
    L.Y. Murphy, J.M. Laget: DAPNIA-SPHN-96-10, 1996Google Scholar
  37. 30.
    M. Anghinolfi et al.: Preprint INP MSU 98–16/517, Moscow State UniversityGoogle Scholar
  38. 31.
    M. Benmerrouche et al.: Phys. Rev. D51, 3237 (1995)ADSGoogle Scholar
  39. 32.
    C.J. Bebek et al.: Phys. Rev. D17, 1693 (1978)ADSGoogle Scholar
  40. 32.
    R. Machleidt: Advances in Nucl. Phys. 19, 189 (1979)Google Scholar
  41. 33.
    K. Gottfried, J.D. Jackson: Nuovo Cim. 34, 736 (1964)Google Scholar
  42. 34.
    D.M. Manley, E.M. Salesky: Phys. Rev. D45, 4002 (1992)ADSGoogle Scholar
  43. 35.
    S.A. Dytman, T.P. Vrana, T-S.H. Lee: nucl-th/9702033.Google Scholar
  44. 36.
    D.G. Cassel et at. : Phys. Rev. D24, 2787 (1981)ADSGoogle Scholar

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© Springer-Verlag 1999

Authors and Affiliations

  • M. Ripani
    • 1
  1. 1.Istituto Nazionale di Fisica NucleareGenovaItaly

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