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Comparative Regge analysis of Λ,ΣΛ(1520) and Θ+ production in γp,πp and pp reactions

  • V. Yu. Grishina
  • L. A. Kondratyuk
  • W. CassingEmail author
  • M. Mirazita
  • P. Rossi
Original Article

Abstract.

Using the Quark-Gluon Strings Model --combined with Regge phenomenology-- we perform a comparative analysis of Λ, Σ0, Λ(1520) and Θ+ production in binary reactions induced by photon, pion and proton beams on the nucleon. We find that the existing experimental data on the γpK+Λ differential and total cross-sections can be described very well by the model for photon energies 1-16 GeV and - t < 2 GeV2 assuming a dominant contribution of the K* Regge trajectory. Moreover, using the same parameters we also reproduce the total γpK+Σ0 and γpK+Λ(1520) cross-sections suggesting a “universality” of the Regge model. In order to check the consistency of the approach we evaluate the differential and total cross-sections for the reaction π-pK0Λ which is also found to be dominated by the K* Regge trajectory. Using the apparent “universality” of the Regge model we extend our scheme to the analysis of the binary reactions γp↦¯0Θ+, π-pK-Θ+ and pp↦Σ+Θ+ as well as the exclusive and inclusive Θ+ production in the reactions ppp¯0Θ+ and pp↦Θ+X. Our detailed studies demonstrate that Θ+ production does not follow the “universality” principle, thus suggesting an essentially different internal structure of the exotic baryon relative to conventional hyperons or hyperon resonances.

PACS.

13.75.Gx Pion-baryon interactions 13.75.Jz Kaon-baryon interactions 12.39.Mk Glueball and nonstandard multi-quark/gluon states 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2005

Authors and Affiliations

  • V. Yu. Grishina
    • 1
  • L. A. Kondratyuk
    • 2
  • W. Cassing
    • 3
    Email author
  • M. Mirazita
    • 4
  • P. Rossi
    • 4
  1. 1.Institute for Nuclear ResearchMoscowRussia
  2. 2.Institute for Theoretical and Experimental PhysicsMoscowRussia
  3. 3.Institute for Theoretical PhysicsUniversity of GiessenGiessenGermany
  4. 4.INFN - Laboratori Nazionali di FrascatiFrascati (RM)Italy

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