$\Psi (2s)$ production in $p+A$ collisions

Abstract

We have analyzed the data on ${\psi }^{\prime }$ production in proton-nucleus ($p+A$) collisions, available from the NA50 Collaboration in the SPS energy domain. The investigated data sets include the absolute production cross sections as well as ${\psi }^{\prime }$-to-Drell Yan (DY) cross section ratios. An adapted version of two component QVZ model has been employed to calculate ${\psi }^{\prime }$ production cross sections. For both ${\psi }^{\prime }$ and DY production, nuclear modifications to the free nucleon structure functions are taken into account. For ${\psi }^{\prime }$, final state interaction of the produced $c\bar{c}$ pairs with the nuclear medium is also taken into account, in accordance with the previously analyzed $J/\psi$ data. A satisfactory description of the data in $p+A$ collisions is obtained. Model calculations are extrapolated to low energy regime to predict the ${\psi }^{\prime }$ suppression in proton induced collisions at near threshold energies.

6 pages, 14 figures. Extensively revised, new figures added

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