Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-08-13
Phys.Rev. C67 (2003) 025202
Physics
Nuclear Physics
Nuclear Theory
12 pages using Revtex, 11 figures, accepted by PRC
Scientific paper
10.1103/PhysRevC.67.025202
The omega production in nucleon-nucleon collisions is described through the decay of intermediate nuclear resonances. Close to threshold the pp --> pp omega cross section is dominated by the off-shell production of omega mesons with masses far below the physical omega mass of 782 MeV. A crucial role plays thereby the N^*(1535) resonance. Due to a strong N omega decay mode this resonance leads to off-shell contributions which are in the vicinity of the threshold about one order of magnitude larger than the experimentally measurable contribution from only the omega peak. After a subtraction of the theoretical "background" from off-shell omega production the available data are accurately reproduced over the entire energy range from very close to threshold up to several GeV above threshold. The scenario of a weaker N^*(1535) --> N omega decay mode which is still consistent with electro- and photo-production data is discussed as well. In the latter case the off-shell contributions to the pp --> pp omega cross section are substantially reduced but the description of the experimental cross section is poor above threshold.
Faessler Amand
Fuchs Ch.
Krivoruchenko M. I.
Martemyanov Boris V.
Shekhter K.
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