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Off-shell omega production in proton-proton collisions near threshold

C. Fuchs·M. I. Krivoruchenko·H. L. Yadav·Amand Faessler·B. V. Martemyanov·K. Shekhter
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Abstract

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.

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C. Fuchs, M. I. Krivoruchenko, H. L. Yadav, Amand Faessler, B. V. Martemyanov, K. Shekhter. 2002-12-20. Off-shell omega production in proton-proton collisions near threshold. https://doi.org/10.1103/physrevc.67.025202

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