BRAHMS Experiment. First experimental results

Some of the first experimental results obtained in BRAHMS Experiment at RHIC (BNL) are presented in this paper. Results on charged particle multiplicity, pseudorapidity distribution, and first results on the particle identification and particle ratios for Au-Au collisions at √sNN 130 GeV are included. Comparisons with different simulation codes were done. The used codes - FRITIOF, HIJING, VENUS and UrQMD - describe different interesting physical quantities. None of the used codes offer a consistent description of the observed features. Some perspectives on future plans for the BRAHMS Experiment are also presented. The new 2001 runs will complete the experimental results and will offer the possibility to investigate deeply the particle production mechanisms and the behaviour of the nuclear matter in extreme conditions of temperature and density. (authors)