Speaker
Xu Cao
(Institute of Modern Physics, CAS, Lanzhou)
Description
A coupled-channel model based on effective Lagrangians is applied to the combined analysis of the $(\pi,\gamma) N \to K\Sigma$ reactions up to the center of mass energy 2 GeV. The couplings constants and resonance parameters of the $K\Sigma$ state are extracted in the calculation. The main resonance contributions to the process come from the $S_{11}(1650)$, $D_{13}(1520)$, $D_{15}(1675)$, $P_{13}(1900)$, $P_{31}(1750)$, $D_{33}(1700)$ and $D_{35}(1930)$ states. The coherent sum of resonances and background contributions is essential to describe the recent photoproduction data obtained by the CLAS, CBELSA, LEPS, and GRAAL groups.
Primary author
Xu Cao
(Institute of Modern Physics, CAS, Lanzhou)
