Eur. Phys. J. A (2010) 46: 315-323
https://doi.org/10.1140/epja/i2010-11047-4

Regular Article - Theoretical Physics

Evaluation of the polarization observables I^S and I^C in the reaction p p

¹ Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany
² Departamento de Fısica Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071, Valencia, Spain
³ Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425, Jülich, Germany
⁴ Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany

Received: 27 February 2010
Accepted: 23 September 2010
Published online: 24 October 2010

Abstract

We evaluate the polarization observables I^S and I^C for the reaction p p , using a chiral unitary framework developed earlier. The I^S and I^C observables have been recently measured for the first time by the CBELSA/TAPS Collaboration. The theoretical predictions of I^S and I^C, 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 (1700)D ₃₃ -resonance and its S -wave decay into (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 (1940)D ₃₃ . We also point out how to further improve the calculation.