2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 17, 275-284 (2003)
DOI: 10.1140/epja/i2002-10151-4

In-medium spectral functions of charmonia studied by $\mth{\bar p + A}$ 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 $\bar{p} + A$ reactions within the Multiple Scattering Monte Carlo (MSMC) approach. We calculate the production of the resonances $\Psi(2S)$ and $\Psi(3770)$ on various nuclei, their propagation and decay to dileptons and $D+\bar{D}$ in the medium and vacuum, respectively, employing parametrizations for the $D,\bar{D}$ 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 $D,\bar{D}$ invariant-mass spectra from light and heavy nuclei are not sufficiently sensitive to the in-medium properties of the $\Psi(2S)$ and $\Psi(3770)$. However, a "suppression" of low-mass dileptons from the $\Psi(3770)$ might be seen experimentally as well as a small broadening of the $\Psi(2S)$ dilepton spectra.

PACS
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