In-medium spectral functions of charmonia studied by reactionsYe.S. Golubeva1, E.L. Bratkovskaya2, W. Cassing3 and L.A. Kondratyuk4
1 Institute for Nuclear Research, 60th October Anniversary Prospect 7A, 117312 Moscow, Russia
2 Institut für Theoretische Physik, Universität Frankfurt, Robert-Mayer Str. 8-10, D-60054 Frankfurt am Main, Germany
3 Institut für Theoretische Physik, Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
4 Institute of Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117259 Moscow, Russia
(Received: 19 December 2002 / Published online: 5 June 2003)
We study the perspectives of resonant charmonium production in reactions within the Multiple Scattering Monte Carlo (MSMC) approach. We calculate the production of the resonances and on various nuclei, their propagation and decay to dileptons and in the medium and vacuum, respectively, employing parametrizations for the self-energies taken from QCD sum rule studies. The elastic and inelastic interactions of the charmonia and open-charm mesons in the medium are taken into account, too. It is found that the invariant-mass spectra from light and heavy nuclei are not sufficiently sensitive to the in-medium properties of the and . However, a "suppression" of low-mass dileptons from the might be seen experimentally as well as a small broadening of the dilepton spectra.
25.43.+t - Antiproton-induced reactions.
14.40.Lb - Charmed mesons.
14.65.Dw - Charmed quarks.
13.25.Ft - Decays of charmed mesons.
© Società Italiana di Fisica, Springer-Verlag 2003