The European Physical Journal A

, Volume 39, Issue 1, pp 61–70 | Cite as

Polarization degrees of freedom in near-threshold photoproduction of \( \omega\) -mesons in the \( \pi^{0}_{}\)\( \gamma\) decay channel

  • A. V. Sarantsev
  • A. V. Anisovich
  • V. A. Nikonov
  • H. Schmieden
Regular Article - Theoretical Physics

Abstract

We study polarization variables in the photoproduction of \( \omega\) -mesons with subsequent \( \omega\)\( \gamma\)\( \pi^{0}_{}\) decay. Single and double polarization observables are calculated as a function of different final-state angles. Reaction models include pomeron (natural parity) and \( \pi^{0}_{}\) (unnatural parity) exchange in the t -channel. In addition, the contribution of s -channel resonances is considered. The sensitivity of the polarization observables to the reaction dynamics is discussed.

PACS

11.80.Et Partial-wave analysis 13.30.-a Decays of baryons 13.60.Le Meson production 

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References

  1. 1.
    N. Isgur, Baryons: The promise, the problems, and the prospects, 7th International Conference on the Structure of Baryons, Santa Fe, New Mexico, 3-7 Oct 1995, edited by B.F. Gibson (World Scientific, Singapore, 1996).Google Scholar
  2. 2.
    S. Capstick, N. Isgur, Phys. Rev. D 34, 2809 (1986)Google Scholar
  3. 3.
    L.Y. Glozman, W. Plessas, K. Varga, R.F. Wagenbrunn, Phys. Rev. D 58, 094030 (1998).Google Scholar
  4. 4.
    U. Löring, K. Kretzschmar, B.C. Metsch, H.R. Petry, Eur. Phys. J. A 10, 309 (2001)Google Scholar
  5. 5.
    Particle Data Group, Phys. Lett. B 592, (2004).Google Scholar
  6. 6.
    N. Isgur, G. Karl, Phys. Lett. B 72, 109 (1977).Google Scholar
  7. 7.
    R. Koniuk, N. Isgur, Phys. Rev. D 21, 1868 (1980).Google Scholar
  8. 8.
    J. Barth, Eur. Phys. J. A 18, 117 (2003).Google Scholar
  9. 9.
    P. Ambrozewicz, Phys. Rev. C 70, 035203 (2004).Google Scholar
  10. 10.
    J. Ajaka, Phys. Rev. Lett. 96, 132003 (2006).Google Scholar
  11. 11.
    G. Penner, U. Mosel, Phys. Rev. C 66, 055211Google Scholar
  12. 12.
    Shklyar, H. Lenske, U. Mosel, G. Penner, Phys. Rev. C 71, 055206 (2005)Google Scholar
  13. 13.
    Q. Zhao, J.S. Al-Khalili, P.L. Cole, Phys. Rev. C 71, 054004 (2005).Google Scholar
  14. 14.
    A.I. Titov, B. Kampfer, Phys. Rev. C 78, 038201 (2008).Google Scholar
  15. 15.
    H. Schmieden, Proceedings of the 11th Workshop on the Physics of Excited Nucleons, NSTAR 2007, Bonn, Germany, September 5-8, 2007, edited by H.-W. Hammer (SIF and Springer, 2008) p. 14, arXiv:0711.4056[nucl-ex].Google Scholar
  16. 16.
    A.V. Anisovich, A.V. Sarantsev, Eur. Phys. J. A 30, 427 (2006) [arXiv:hep-ph/0605135].Google Scholar
  17. 17.
    W.T. Chiang, Phys. Rev. C 68, 045202 (2003)Google Scholar
  18. 18.
    I.S. Barker, A. Donnachie, J.K. Storrow, Nucl. Phys. B 95, 347 (1975).Google Scholar
  19. 19.
    K. Schilling, P. Seyboth, G.E. Wolf, Nucl. Phys. B 15, 397 (1970)Google Scholar
  20. 20.
    Q. Zhao, Phys. Rev. C 63, 025203 (2001) [arXiv:nucl-th/0010038].Google Scholar
  21. 21.
    A.I. Titov, T.-S.H. Lee, Phys. Rev. C 66, 015204 (2002).Google Scholar
  22. 22.
    L. Criegee, Phys. Rev. Lett. 25, 1306 (1970).Google Scholar
  23. 23.
    J. Ballam, Phys. Rev. D 7, 3150 (1973).Google Scholar
  24. 24.
    J. Ballam, Phys. Rev. Lett. 24, 1364 (1970)Google Scholar
  25. 25.
    V. Liebenau, Doctoral Thesis, BONN-IR-1983-14.Google Scholar
  26. 26.
    M. Atkinson, Nucl. Phys. B 231, 15 (1984).Google Scholar
  27. 27.
    F.J. Gilman, Phys. Lett. B 31, 387 (1970).Google Scholar
  28. 28.
    B. Friman, M. Soyeur, Nucl. Phys. A 600, 477 (1996).Google Scholar

Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • A. V. Sarantsev
    • 1
    • 2
  • A. V. Anisovich
    • 1
    • 2
  • V. A. Nikonov
    • 1
    • 2
  • H. Schmieden
    • 3
  1. 1.Helmholtz-Institut für Strahlen- und KernphysikUniversität BonnBonnGermany
  2. 2.Petersburg Nuclear Physics InstituteGatchinaRussia
  3. 3.Physikalisches InstitutUniversität BonnBonnGermany

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