Eur. Phys. J. A 11, 237-245 (2001)
Medium effects in the production and decay of -mesons in pA collisions in the GeV regionYe.S. Golubeva1, L.A. Kondratyuk2, M. Büscher3, W. Cassing4, V. Hejny3 and H. Ströher3
1 Institute of Nuclear Research, 117312 Moscow, Russia
2 Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia
3 Forschungszentrum Jülich, Institut für Kernphysik, 52425 Jülich, Germany
4 Institute for Theoretical Physics, University of Giessen, D-35392 Giessen, Germany
(Received: 2 April 2001 / Revised version: 23 May 2001 Communicated by A. Schäfer)
The resonance production and its decay in pA reactions close to threshold is considered within the Intranuclear Cascade (INC) model. The invariant-mass distribution shows two components which correspond to the decay "inside" and "outside" the nucleus, respectively. The "inside" component is distorted by medium effects, which introduce a mass shift as well as collisional broadening for the -meson and its decaying pion. The relative contribution of the "inside" component is analyzed in detail for different kinematical conditions and nuclear targets. It is demonstrated that a measurement of the correlation in azimuthal angle between the and momenta allows to separate events related to the "inside" decay from different sources of background when uncorrelated 's and 's are produced.
25.40.Ep - Inelastic proton scattering.
25.80.-e - Meson- and hyperon-induced reactions.
25.80.Ek - Pion inelastic scattering.
© Società Italiana di Fisica, Springer-Verlag 2001