# Cross sections for charmonia dissociation in collisions with pions, rhos and kaons

• We calculate the unpolarized cross sections for dissociation reactions of charmonia in collisions with π, ρ and K in a potential that is derived from QCD. The reactions are governed by the quark-interchange processes. The mesonic quark-antiquark relative-motion wave functions are determined by the central spin-independent terms of the potential. The numerical wave functions and cross sections are parametrized. The difference of transition amplitudes in the prior form and in the post form is explored by deriving and examining the transition amplitudes of the one-gluon-exchange spin-spin term of the potential in the two forms. We find that the post-prior discrepancy in meson-meson elastic scattering that is governed by quark-interchange processes depends on the difference of quark or antiquark masses and of quark-antiquark spatial distributions of the two mesons.

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LIU Yan-Ju, XU Xiao-Ming and LI Yu-Qi. Cross sections for charmonia dissociation in collisions with pions, rhos and kaons[J]. Chinese Physics C, 2008, 32(9): 733-739. doi: 10.1088/1674-1137/32/9/010
LIU Yan-Ju, XU Xiao-Ming and LI Yu-Qi. Cross sections for charmonia dissociation in collisions with pions, rhos and kaons[J]. Chinese Physics C, 2008, 32(9): 733-739.
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Revised: 2008-03-03
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沈阳化工大学材料科学与工程学院 沈阳 110142

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## Cross sections for charmonia dissociation in collisions with pions, rhos and kaons

###### Corresponding author: XU Xiao-Ming,

Abstract:

We calculate the unpolarized cross sections for dissociation reactions of charmonia in collisions with π, ρ and K in a potential that is derived from QCD. The reactions are governed by the quark-interchange processes. The mesonic quark-antiquark relative-motion wave functions are determined by the central spin-independent terms of the potential. The numerical wave functions and cross sections are parametrized. The difference of transition amplitudes in the prior form and in the post form is explored by deriving and examining the transition amplitudes of the one-gluon-exchange spin-spin term of the potential in the two forms. We find that the post-prior discrepancy in meson-meson elastic scattering that is governed by quark-interchange processes depends on the difference of quark or antiquark masses and of quark-antiquark spatial distributions of the two mesons.

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