Chiral Lagrangian approach to the J/psi breakup cross section

Details Chiral Lagrangian approach to the J/psi breakup cross section Chiral Lagrangian approach to the J/psi breakup cross section

2001-12-28

arxiv.org/abs/hep-ph/0112354v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 6 figures, 1 table

Scientific paper

We summarize the results of the SU(4) chiral meson Lagrangian approach to the cross section for J/psi breakup by pion and rho meson impact and suggest a new scheme for the introduction of formfactors for the meson-meson interaction. This scheme respects the fact that on the quark level of description the contact and the meson exchange diagrams are constructed by so-called box and triangle diagrams which contain a different number of vertex functions for the quark-meson coupling. A model calculation for Gaussian vertex functions is presented and the relative importance of contact and meson exchange processes is discussed. We evaluate the dependence of the breakup cross section on the masses of the final D-meson states which can be used for the study of in-medium effects on this quantity.

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