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      Form-factor dependence of the J/psi dissociation cross sections in meson exchange model

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          Abstract

          The J/ψ dissociation by π and ρ mesons is examined in meson exchange model and compared to the quark interchange model. We found that the main difference between the predictions of the two models could be resolved by the form factors and the contact interactions in meson exchange model calculations. By adopting covariant form factors and adjusting the four-point couplings, we found that the meson exchange model could give similar predictions with the quark interchange models not only for the magnitudes but also for the energy dependence of the low-energy dissociation cross sections of the J/ψ by π and ρ mesons. Our finding suggests a way to understand one of the discrepancies among the existing model predictions on the J/ψ dissociation cross sections by light hadrons.

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          DDπ and BBπ couplings in QCD

          , , (2010)
          We calculate the DDπ and BBπ couplings using QCD sum rules on the light-cone. In this approach, the large-distance dynamics is incorporated in a set of pion wave functions. We take into account two-particle and three-particle wave functions of twist 2, 3 and 4. The resulting values of the coupling constants are gDDπ=12.5±1 and gBBπ=29±3. From this we predict the partial width Γ(D+\raD0π+)=32±5 keV. We also discuss the soft-pion limit of the sum rules which is equivalent to the external axial field approach employed in earlier calculations. Furthermore, using gBBπ and gDDπ the pole dominance model for the B\raπ and D\raπ semileptonic form factors is compared with the direct calculation of these form factors in the same framework of light-cone sum rules.
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            Quark exchange model for charmonium dissociation in hot hadronic matter

            A diagrammatic approach to quark exchange processes in meson-meson scattering is applied to the case of inelastic reactions of the type (Q\barQ)+(q\barq)(Q\barq)+(q\barQ), where Q and q refer to heavy and light quarks, respectively. This string-flip process is discussed as a microscopic mechanism for charmonium dissociation (absorption) in hadronic matter. The cross section for the reaction J/ψ+πD+ˉD 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.
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              Model for J/ψ absorption in hadronic matter

              Ziwei Lin, C Ko (1999)
              The cross sections for J/ψ absorption by π and ρ mesons are studied in a meson-exchange model that includes not only pseudoscalar-pseudoscalar-vector-meson couplings but also three-vector-meson and four-point couplings. We find that they are much larger than in a previous study where only pseudoscalar-pseudoscalar-vector-meson couplings were considered. Including form factors at interaction vertices, the J/ψ absorption cross sections σπψ and σρψ are found to have values on the order of 7 mb and 3 mb, respectively. Their thermal averages in hadronic matter at temperature T=150 MeV are, respectively, about 1 mb and 2 mb.
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                Author and article information

                Journal
                24 May 2002
                Article
                nucl-th/0205065
                39f6d6fc-88c4-4c6a-8306-a857193679c3
                History
                Custom metadata
                J.Korean Phys.Soc.43:1003-1008,2003
                10 pages, REVTeX, 3 figures
                nucl-th hep-ph

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