Study The Properties Of Resonance In The ?_c Weak Decay

The study of properties of hadron resonances is one of the popular topics in hadron physics.In the traditional quark model,hadrons are composed of mesons and baryons.But in the picture of QCD,there allows many other structures,such as tetraquark,pentaquark,hadronic molecule,hybrid,glueball and so on.Most of the hadrons found by the experiment can be regard as mesons and baryons,but there are also many states can't be explained in the traditional quark model,especially for the lowest-mass light scalar mesons and low-mass baryon excited states.In recent years,a lot of experimental data about the light scalar mesons and excited states of low mass baryons have been accumulated in the international large scientific devices.How to describe these experimental data reasonably and extract the information of the relevant hadron resonance states from these experimental data is of great significance for us to deeply understand the non-perturbation property of QCD.Recently,BESIII collaboration has measured the branching ratio of the Cabibbo suppressed processes ?_c?p?+?-and ?_c?pK+K-,in the invariant mass spectrum of ?+?-,we can see the structure of the resonance f0(500)near 500 MeV,we can also see the structure of resonance f0(980)near 980 MeV and the structure of meson ?.BESIII has also measured the process ?_c??+??,in the invariant mass spectrum of ??,we can see the structure of resonance ?(1670)and there is a structure of resonance ?(1385)with a increase of the data near 1430 MeV found in the invariant mass spectrum of ?+?,we think that there should be a resonance?(1430).We used the chiral unitary approach to calculate these processes and studied the invariant mass spectrum of ?+?-,K+K-,??,?+?,we find the structures of resonances fo(500),f0(980)and the meson p,in the invariant mass spectrum of K+K-,we can see a enhancement near the threshold of K+K-correspond to the resonance f0(980),a0(980)and the structure of meson ?.In the invariant mass spectrrum of ?? we can see the structure of resonance A(1670),and there is a structure of resonance ?(1385)near 1385 MeV and a sharp structure of resonance?(1430)near 1430 MeV in the invariant mass spectrum of ?+?.In a word,this work is important for us to understand hadron resonances f0(500),f0(980),a0(980),?(1385),?(1430),?(1670),and it will provid the theoretical basis for the future experimental measure of BESIII.