Advertisement

Medium effects in the production and π0γ decay of ω-mesons in pA collisions in the GeV region

  • Ye.S. Golubeva
  • L.A. Kondratyuk
  • M. Büscher
  • W. Cassing
  • V. Hejny
  • H. Ströher

Abstract:

The ω resonance production and its π0γ decay in pA reactions close to threshold is considered within the Intranuclear Cascade (INC) model. The π0γ invariant-mass distribution shows two components which correspond to the ω 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 ω-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 π0 and γ momenta allows to separate events related to the “inside”ω decay from different sources of background when uncorrelated π0's and γ's are produced.

PACS. 25.40.Ep Inelastic proton scattering – 25.80.-e Meson- and hyperon-induced reactions – 25.80.Ek Pion inelastic scattering 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Società Italiana di Fisica and Springer-Verlag 2001

Authors and Affiliations

  • Ye.S. Golubeva
    • 1
  • L.A. Kondratyuk
    • 2
  • M. Büscher
    • 3
  • W. Cassing
    • 4
  • V. Hejny
    • 3
  • H. Ströher
    • 3
  1. 1.Institute of Nuclear Research, 117312 Moscow, RussiaRU
  2. 2.Institute of Theoretical and Experimental Physics, 117259 Moscow, RussiaRU
  3. 3.Forschungszentrum Jülich, Institut für Kernphysik, 52425 Jülich, GermanyDE
  4. 4.Institute for Theoretical Physics, University of Giessen, D-35392 Giessen, GermanyDE

Personalised recommendations