Examine The Properties Of The Resonance States X (3940) And X (3930) In The Weak Decay Of The Heavy B Meson

Many famous internationally collaborations such as LHCb,JLab etc are working to discover various hadronic resonance states and the theoretical study on the nature of these states has been very active,sicne this is an important place to test the basic theory of interaction.The chiral unitary approach has successfully described many experimentally resonance states,including the dynamically generated resonance states with charm X(3(3940)and X(3(3930).In present thesis we use this approach to study the weak decay process of meson,B~+?J/?wK~+reaction,and we hope to test the molecular nature of the resonance state X(3(3940)and X(3(3930).Within the chiral unitary approach,we first investigate the reaction mechanism B~+?J/?wK~+and obtain the final differential cross section.Then we analyze this reaction for different sets of parameters.The results show that in / invariant mass spectrum,we see the dynamically generated resonance states X(3(3940)and X(3(3930),which are strongly coupled not only to D* (?)*but also to / channels,leading to the formation of resonance peaks and cusp at the D*(?)*threshold.This is very interesting,since it is related to the nature of dynamically generated molecular states.We further discuss the influence of damping factor on this reaction.Finally,we compare our result with LHCb experimental data and find in reasonably agreement with the data,further testing the nature of molecular states of X(3(3940)and X(3(3930)by using mechanism of meson weak decay proposed in the paper.It is further tested that the resonance states are generated by dynamics.It is meaningful and significant direction to test the molecular nature of X(3(3940)andX(3(3930)resonances in future possible experiments.