η production off the proton in a chiral quark approach
1 Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS & Lanzhou University
2 Nuclear theory group, Institute of Modern Physics, Chinese Academy of Sciences
we report our chiral quark approach for the eta productions combined with the potential model. Starting from an effective chiral Lagrangian, the amplitude of pseudoscalar production is derived and connected to the helicity and decay amplitudes under the SU(3) symmetry. The breaking of the SU(3) symmetry is introduced by the configuration mixing which can be calculated from the potential model. To extend our model to higher energy region where CLAS and CBELSA/TAPS Collaborations release their new data recently, Reggeized trajectories instead of simple ρ and ω poles is adopted. Both the spectrum and the η productions are calculated and well compared with the experiment data. The results suggest that the contribution from “missing” resonances, with masses below 2 GeV, is found to be negligible in the considered processes.
© Owned by the authors, published by EDP Sciences, 2012