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The European Physical Journal A

, Volume 31, Issue 4, pp 645–648 | Cite as

The E687 cryptoexotic vector meson candidate

  • R. Baldini
  • L. Benussi
  • M. Bertani
  • S. Bianco
  • F. L. Fabbri
  • S. Pacetti Email author
  • A. Zallo
QNP 2006

Abstract.

A new study of the dip observed at 1.9GeV by the Fermilab experiment E687 in diffractive photoproduction of 3π +3π - is presented. The E687 and the BABAR data on the annihilation cross-section σ(e + e -→3π +3π -), obtained with initial-state radiation, are fitted all together. The fit function is based on a simple mixing mechanism that explains the manifestation of a resonance as a dip. Possible interpretations in terms of hybrids and tetraquark states are considered.

PACS.

13.40.Hq Electromagnetic decays 13.66.Bc Hadron production in e-e+ interactions 25.20.Lj Photoproduction reactions 

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References

  1. 1.
    P.L. Frabetti, Phys. Lett. B 514, 240 (2001).CrossRefADSGoogle Scholar
  2. 2.
    P.L. Frabetti, Phys. Lett. B 578, 290 (2004).CrossRefADSGoogle Scholar
  3. 3.
    R. Baldini, reported at the FENICE Workshop, 1998, Frascati.Google Scholar
  4. 4.
    B. Aubert, Phys. Rev. D 73, 052003 (2006).CrossRefADSGoogle Scholar
  5. 5.
    E687 Collaboration (P. Lebrun), FERMILAB-CONF-97-387-E, talk presented at Hadron 97, Upton, USA.Google Scholar
  6. 6.
    G.A. Schuler, T. Sjostrand, Nucl. Phys. B 407, 539 (1993).CrossRefADSGoogle Scholar
  7. 7.
    J.J. Sakurai, Ann. Phys. (N.Y.) 11, 1 (1960)CrossRefADSMathSciNetGoogle Scholar
  8. 8.
    A. Donnachie, H.G. Dosch, P.V. Landsho, O. Nachtmann, Pomeron Physics and QCD (Cambridge University Press, 2002)Google Scholar
  9. 9.
    B. Aubert, Phys. Rev. D 71, 052001 (2005).CrossRefADSGoogle Scholar
  10. 10.
    M. Jacob, R. Slansky, Phys. Lett. B 37, 408 (1971)CrossRefADSGoogle Scholar
  11. 11.
    P.J. Franzini, F.J. Gilman, Phys. Rev. D 32, 237 (1985).CrossRefADSGoogle Scholar
  12. 12.
    S.R. Coleman, H.J. Schnitzer, Phys. Rev. 134, B863 (1964)Google Scholar
  13. 13.
    F.E. Close, AIP Conf. Proc. 717, 919 (2004)CrossRefADSGoogle Scholar

Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • R. Baldini
    • 1
    • 2
  • L. Benussi
    • 2
  • M. Bertani
    • 2
  • S. Bianco
    • 2
  • F. L. Fabbri
    • 2
  • S. Pacetti
    • 2
    Email author
  • A. Zallo
    • 2
  1. 1.Centro Studi e Ricerche Enrico FermiRomaItaly
  2. 2.Laboratori Nazionali di Frascati, INFNFrascatiItaly

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