Ï c 0 (1 P ) decay into Î£Â¯Â Î£Ï in search of an I = 1, 1/2 â baryon state around K¯N threshold
En Wang (Department of Physics, Zhengzhou University, Zhengzhou, Henan, 450001, China); Ju-Jun Xie (State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China); Eulogio Oset (Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China, Departamento de Física Teórica, IFIC, Centro Mixto Universidad de Valencia, CSIC Institutos de Investigación de Paterna, Aptdo. 22085, Valencia, 46071, Spain)
We present the theoretical study of the process χc0(1P)→Σ¯Σπ decay, by taking into account the π Σ and πΣ¯ final state interactions of the final meson-baryon pair based on the chiral unitary approach. We show that the process filters the isospin I=1 in the π Σ channel and offers a reaction to test the existence of an I=1 state with strangeness S=−1 and spin-parity Jp=1/2− around the K¯N threshold predicted by some theories and supported by some experiments.
