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\(\pi\pi\) correlations in \(\gamma + A\) reactions

  • J. G. MesschendorpEmail author
Article

Abstract.

Preliminary differential cross-sections of the reactions \(A(\gamma,\pi^{0}\pi^{0})\) and \(A(\gamma,\pi^{0}\pi^ + + \pi^{0}\pi^-)\) with A = 1 H, 12 C, and nat Pb are presented. A significant nuclear-mass dependence of the \(\pi\pi\) invariant-mass distribution is found in the \(\pi^{0}\pi^{0}\) channel. The dependence is not observed in the \(\pi^{0}\pi^{\pm}\) channel. The in-medium observation in the \(\pi^{0}\pi^{0}\) channel is consistent with an in-medium modification of the \(\pi\pi\) interaction in the I = J = 0 channel, changing width and pole position of a \(\pi\pi\) resonant state.

Keywords

Resonant State Pole Position 
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References

  1. 1.
    D.E. Groom, Eur. Phys. J. C 15, 1 (2000).Google Scholar
  2. 2.
    J.A. Oller, Phys. Rev. Lett. 80, 3452 (1998).CrossRefGoogle Scholar
  3. 3.
    E. Oset, nucl-th/0112033, 2001.Google Scholar
  4. 4.
    L. Roca, Phys. Lett. B 541, 77 (2002).CrossRefGoogle Scholar
  5. 5.
    F. Bonutti, Phys. Rev. Lett. 77, 603 (1996).CrossRefGoogle Scholar
  6. 6.
    A. Starostin, Phys. Rev. Lett. 85, 5539 (2000).CrossRefGoogle Scholar
  7. 7.
    L. Roca, E. Oset, M.J. Vicente Vacas, private communications.Google Scholar
  8. 8.
    I. Anthony, Nucl. Instrum. Methods A 301, 230 (1991).CrossRefGoogle Scholar
  9. 9.
    A.R. Gabler, Nucl. Instrum. Methods A 346, 168 (1994).CrossRefGoogle Scholar
  10. 10.
    S. Janssen, dissertation, University of Gießen (2002).Google Scholar
  11. 11.
    M.J. Vicente Vacas, E. Oset, Phys. Rev. C 60, 064621 (1999).CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  1. 1.II. Physikalisches InstitutUniversity of GießenGermany

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