UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2001 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
Collision geometry reflected by different detectors at BRAHMS experimental set-up


Authors:
BRAHMS Collaboration and Oana CĀ?U, Oana CULEA, C?t?lin RISTEA, Gabriel TABAN, Emil STAN, Marius RUS, Adriana CISTELECAN, Adrian PERIANU


Affiliation:
Faculty of Physics, University of Bucharest, MagureleRO-76900, Bucharest, Romania



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Abstract:
The BRAHMS experiment at Relativistic Heavy Ion Collider (RHIC) from Brookhaven National Laboratory (BNL) [1] has as one of the main goal the study of the general characteristics of the protons, pions and kaons yields in Au-Au collisions at energies between and [2]. Taking into account the wide rapidity and transverse ranges covered by these spectrometers it is possible to obtain information both on the very central region and spectators. Therefore, in the present work we consider, using the first experimental results from the BRAHMS experiment [3], the specific differences among the distributions of the interesting physical quantities reflected by the detectors of the experimental set-up. For example, collision centrality is well reflected by the longitudinal momentum distribution and pseudorapidity distribution, as well as on the ZDC information. Assuming similar production mechanisms for charged particles for heavy ion reactions in the 4-200 A GeV energy range [4], and the estimations of some simulation codes (HIJING, UrQMD, NEXUS and FRITIOF) we establish some connections with experimental results. An interesting result is related to the different behaviours of the charged particle multiplicities and the ratios of the positive and negative particle of the same kind: the multiplicities increase with the collision centrality, and the ratios seems do not depend on the collision centrality. An evaluation of the ratio between the energy amounts used in particle production and particle flow is possible, too. Important indications in the analysis of the future experimental data are obtained. [1]. F.Videbaek - The BRAHMS Experiment at RHIC. Goals and Status - Workshop UIC, June 14-17,1998 - World Scientific, Singapore, New Jersey, London, Hong Kong, 1998 [2]. BRAHMS Collaboration - RHIC beam use proposal - April 1999 [3]. F.Videbaek - Results from the BRAHMS Experiment at RHIC - Quark Matter Conference, Stony Brook and Brookhaven, USA, January 2001 - plenary lecture - will be published in Nuclear Physics B (Supplements) [4]. M.I.Adamovich et al (EMU01 Collaboration) - Z.Phys.A358(1997)337