Interplay of Interference Effects in Production of $J/Ψ$ and $Ψ'$ off Nuclei

Details Interplay of Interference Effects in Production of $J/Ψ$ and $Ψ'$ off Nuclei Interplay of Interference Effects in Production of $J/Ψ$ and $Ψ'$ off Nuclei

1996-06-06

arxiv.org/abs/nucl-th/9606010v2

Physics

Nuclear Physics

Nuclear Theory

Latex 7 pages, 4 postscript files with figures. Invited talks presented by B. Kopeliovich at the XXXI st Rencontres de Moriond

Scientific paper

Our main observations are: (i) The effective path length of the $c\bar c$ wave packet, which is produced in the nucleus, grows with the energy of the produced charmonium. The variation is controlled by the coherence length $l_c=2E_{\Psi}/M^2_{\Psi}$. (ii) A colorless $c\bar c$ wave packet produced in $pp$-interaction is a specific linear combination of the $J/\Psi$ and $\Psi'$ states, and interacts substantially weaker that any of its components. The time evolution of this wave packet is controlled by the formation length, $l_f=2E_{\Psi}/(M^2_{\Psi'} - M^2_{\Psi})$. Exact formulas incorporating with these effects are derived. The interplay of the two phenomena results in a nontrivial energy- and $x_F$-dependence of the nuclear suppression of the charmonium production in proton-nucleus and nucleus-nucleus collisions and explains some of the experimentally observed effects.

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