DOI: 10.1140/epja/i2002-10151-4
In-medium spectral functions of charmonia studied by
reactions
Ye.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
Wolfgang.Cassing@theo.physik.uni-giessen.de
(Received: 19 December 2002 / Published online: 5 June 2003)
Abstract
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