摘要: A diagrammatic approach to quark exchange processes in meson-meson scattering is applied to the case of inelastic reactions of the type (Q anti Q)+(q anti q)(yields)(Q anti q)+(q anti Q), where Q and q refer to heavy and light qua... 展开 A diagrammatic approach to quark exchange processes in meson-meson scattering is applied to the case of inelastic reactions of the type (Q anti Q)+(q anti q)(yields)(Q anti q)+(q anti Q), where Q and q refer to heavy and light quarks, respectively. This string-flip process is discussed as a mircoscopic mechanism for charmonium dissociation (absorption) in hadronic matter. The cross section for the reaction J/(psi)+(pi)(yields)D+ anti D is calculated using a potential model, which is fitted to the meson mass spectrum. The temperature dependence of the relaxation time for the J/(psi) distribution in a homogeneous thermal pion gas is obtained. The use of charmonium for the diagnostics of the state of hot hadronic matter produced in ultrarelativistic nucleus-nucleus collisions is discussed. (orig.) (ERA citation 20:011366) 收起