How to Improve UrQMD Model to Describe NA61/SHINE Experimental Data

Details How to Improve UrQMD Model to Describe NA61/SHINE Experimental Data How to Improve UrQMD Model to Describe NA61/SHINE Experimental Data

2011-07-02

arxiv.org/abs/1107.0374v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages

Scientific paper

The NA61/SHINE collaboration measured inclusive cross sections of pi+ and pi- meson production in the interactions of 31 GeV/c proton with carbon nuclei at small emission angles (0 - 420 mrad). The collaboration presented also predictions of Monte Carlo models - FLUKA, VENUS and UrQMD, in a comparison with the data. The worst description of the data was observed for UrQMD model results. In the present paper it is shown that the drawback of the UrQMD model is connected with an inaccurate treatment of low mass string fragmentation. The strings appeared at a diffraction of target nucleons. A simple patch is proposed to overcome the problem.

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