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arXiv · hep-ph/9809442

J/ψSuppression in Nucleus-Nucleus Collisions

Jianwei Qiu·James P. Vary·Xiaofei Zhang
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Abstract

We propose a model for the production and suppression of J/ψmesons in high-energy hadronic collisions. We factorized the process into a production of the $c\bar{c}$ pairs of relative momentum $k=k_c-k_{\bar{c}}$ convoluted with a transition probability from the produced $c\bar{c}$ pairs into the observed J/$ψ$ mesons. As the produced $c\bar{c}$ pairs exit the nuclear matter, the multiple scattering between the colored $c$ and $\bar{c}$ and the nuclear medium increases the square of the relative momentum between the $c$ and $\bar{c}, q^2=-k^2$, such that some of the $c\bar{c}$ pairs gain enough invariant mass to transmute into open charm states. With only one parameter, the amount of energy gained by the produced $c\bar{c}$ pair per unit length in the nuclear medium, our model can fit all observed J/ψsuppression data including recent NA50 data from Pb-Pb collisions.

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Jianwei Qiu, James P. Vary, Xiaofei Zhang. 1998-09-18. J/ψSuppression in Nucleus-Nucleus Collisions. https://doi.org/10.1103/physrevlett.88.232301

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