2018 Impact factor 2.481
Hadrons and Nuclei


Eur. Phys. J. A 14, 255-263 (2002)
DOI: 10.1140/epja/i2002-10002-4

Probing the interactions of charmed mesons with nuclei in $\mth{\bar p}$-induced reactions

Ye.S. Golubeva1, W. Cassing2 and L.A. Kondratyuk3

1  Institute for Nuclear Research, 60th October Anniversary Prospect 7A, 117312 Moscow, Russia
2  Institut für Theoretische Physik, Universität Giessen, D-35392 Giessen, Germany
3  Institute of Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117259 Moscow, Russia

Wolfgang.Cassing@theo.physik.uni-giessen.de

(Received: 1 March 2002 Communicated by V.V. Anisovich)

Abstract
We study the perspectives of resonant and nonresonant charmed-meson production in $\bar{p} + A$ reactions within the Multiple Scattering Monte Carlo (MSMC) approach. We calculate the production of the resonances $\Psi(3770), \Psi(4040)$ and $\Psi(4160)$ on various nuclei, their propagation and decay to $D,
\bar{D}, D^*, \bar{D}^*, D_s, \bar{D}_s$ in the medium and vacuum, respectively. The modifications of the open charm vector mesons in the nuclear medium are found to be rather moderate or even small such that dilepton spectroscopy will require an invariant mass resolution of a few MeV. Furthermore, the elastic and inelastic interactions of the open charm mesons in the medium are taken into account, which can be related to (u,d)-, s- or c-quark exchange with nucleons. It is found that by studying the $D/\bar{D}$ ratio for low momenta in the laboratory ( $\leq 2-2.2$ GeV/c) as a function of the target mass A stringent constraints on the c-quark exchange cross-section can be obtained. On the other hand, the ratios D-s/D+s as well as D/D-s and D/D+s at low momenta as a function of A will permit to fix independently the strength of the s-quark exchange reaction in D-s N scattering.

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 2002