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The European Physical Journal A

, Volume 46, Issue 2, pp 315–323 | Cite as

Evaluation of the polarization observables IS and IC in the reaction \( \gamma\)p \( \rightarrow\) \( \pi^{0}_{}\) \( \eta\)p

  • M. Döring
  • E. Oset
  • U. -G. Meißner
Regular Article - Theoretical Physics

Abstract.

We evaluate the polarization observables IS and IC for the reaction \( \gamma\) p \( \rightarrow\) \( \pi^{0}_{}\) \( \eta\) p , using a chiral unitary framework developed earlier. The IS and IC observables have been recently measured for the first time by the CBELSA/TAPS Collaboration. The theoretical predictions of IS and IC, given for altogether 18 angle-dependent functions, are in good agreement with the measurements. Also, the asymmetry dΣ/d cos θ evaluated here agrees with the data. We show the importance of the \( \Delta\)(1700)D 33 -resonance and its S -wave decay into \( \eta\) \( \Delta\)(1232) . The result can be considered as a further confirmation of the dynamical nature of this resonance. At the highest energies, deviations of the predictions from the data start to become noticeable, which leaves room for additional processes and resonances such as a \( \Delta\)(1940)D 33 . We also point out how to further improve the calculation.

Keywords

Invariant Mass Polarization Plane Reaction Plane Phase Space Integral Photon Coupling 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • M. Döring
    • 1
  • E. Oset
    • 2
  • U. -G. Meißner
    • 1
    • 3
    • 4
  1. 1.Institut für Kernphysik and Jülich Center for Hadron PhysicsForschungszentrum JülichJülichGermany
  2. 2.Departamento de Fısica Teórica and IFIC, Centro Mixto Universidad de Valencia-CSICInstitutos de Investigación de PaternaValenciaSpain
  3. 3.Institute for Advanced SimulationForschungszentrum JülichJülichGermany
  4. 4.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical PhysicsUniversität BonnBonnGermany

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