Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2001-03-30
Eur.Phys.J. A11 (2001) 237-245
Physics
Nuclear Physics
Nuclear Theory
24 pages, 11 figures
Scientific paper
10.1007/s100500170088
The omega-resonance production and its pi0 gamma decay in p-A reactions close to threshold is considered within the Intranuclear Cascade (INC) Model. The pi0 gamma invariant mass distribution shows two components which correspond to the omega 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 omega-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 pi0 and gamma momenta allows to separate events related to the 'inside' omega decay from different sources of background when uncorrelated pi0's and gamma's are produced.
Buescher Markus
Cassing Wolfgang
Golubeva Ye. S.
Hejny V.
Kondratyuk L. A.
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