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Conference: Bucharest University Faculty of Physics 2002 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Tracking Algorithms In Ultrarelativistic Nuclear Experiments Applied At BRAHMS - RHIC (BNL).

Authors:

D.Argintaru[2], I. G. Bearden[6], D. Beavis[1], C. Besliu[2], Y. Blyakhman[5], H. Boggild[6], J. Brzychczyk[3], B. Budick[5], C. Chasman[1], C. H. Christensen[6], P. Christiansen[6], J. Cibor[7], F. Constantin[2], R. Debbe[1], D. Felea[2], J. J. Gaardhoje[6], K. Grotowski[3], K. Hagel[7], O. Hansen[6], A. Holm[6], A. K. Holme[11], H. Ito[9], E. Jacobsen[6], Al. Jipa[2], J. I. Jorde[8], F. Jundt[12], C. E. Jorgensen[6], E. J. Kim[4], T. Kozik[3], T. Keutgen[3], T. M. Larsen[11], J. H. Lee[1], Y. K. Lee[4], G. Lovhoiden[11], Z. Majka[3], A. Makeev[7], E. McBreen[1], M. Murray[7], J. Natowitz[7], B. S. Nielsen[6], K. Olchanski[1], J. W. Olness[1], D. Ouerdane[6], R. Planeta[3], F. Rami[12], C. Ristea[2], D. Roehrich[8], B. Samset[11], S. J. Sanders[9], R. Scheetz[1], Z. Sosin[3], P. Staszel[3], T. F. Thorstein[8], T. S. Tveter[11], F. Videbaek[1], R. Wada[7], A. Wieloch[3], R. Zaharia[2], I. S. Zgura[2] and I.Arsene[2], E.Stan[2]

Affiliation:

[1] Brookhaven National Laboratory, Upton, NY 11973, U.S.A.

[2] University of Bucharest, ROMANIA

[3] Jagellonian University, Krakow, POLAND

[4] Johns Hopkins University, Baltimore, MD 21218, U.S.A

[5] New York University, New York, NY 10003, U.S.A

[6] Niels Bohr Institute for Astronomy, Physics and Geographics, University of Copenhagen, DENMARK

[7] Texas A&M Univesity, College Station, TX 77843 - 3366, U.S.A

[8] Fysik Institutt, Universiteten i Bergen, NORWAY

[9] University of Kansas, Lawrence, KS 66045, U.S.A

[10] University of Lund, 22100 Lund, SWEDEN

[11] University of Oslo, Oslo, NORWAY

[12] Univerity Louis Pasteur, Strasbourg, FRANCE.

E-mail

Keywords:

Abstract:

Considering the experimental results obtained in one of the major experiments at the Relativistic Heavy Ion Collider from Brookhaven National Laboratory - Upton, New York, USA - namely BRAHMS (Broad Range Hadron Magnetic Spectometers) Experiment - which studies Au + Au collisions at 200 GeV/n (center of mass system), we study the collision geometry implications on the experimental yields. Making se of the two spectrometers from BRAHMS - providing very accurate angular distributions - we find out out the importance of vertex determination on the physical event reconstruction and on the centrality cuts. The vertex problem is of major importance in collider physics, showing wide distrributions. In this analysis of the experimental data are used three groups of detectors,namely: the Beam - Beam Counters and the Zero Degree Calorimeters, providing vertex measurements by time-of-flight right-left methods, and the time projection chambers that reconstruct the vertex by the back-projection of the produced clusters. The methods used are presented and a qualitative comparison between the experimental data from Au + Au collisions at 130 GeV and 200 GeV energies is made. Finally, we present the main problems regarding the track reconstruction and also some visualization algorithms from peculiar tracking detectors from BRAHMS.