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Two-particle correlations at 40, 80, and 158 AGeV Pb - Au collisions
In this thesis, a centrality dependent study of tow-particle momentum correlations of like-sign pions (HBT interferometry) from Pb-Au collisions at beam energies of 40, 80 and 158 AGeV is presented. The three-dimensional correlation function C_2, depending on the relative momentum components of the...
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2002
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Acceso en línea: | http://cds.cern.ch/record/1497280 |
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author | Tilsner, Heinz |
author_facet | Tilsner, Heinz |
author_sort | Tilsner, Heinz |
collection | CERN |
description | In this thesis, a centrality dependent study of tow-particle momentum correlations of like-sign pions (HBT interferometry) from Pb-Au collisions at beam energies of 40, 80 and 158 AGeV is presented. The three-dimensional correlation function C_2, depending on the relative momentum components of the particle pair, was parameterized using a three-dimensional Gaussian, modified to consider the final state Coulomb repulsion. The parameterization was done in the Cartesian out-side-long system as proposed by G. Bertsch and S. Pratt. A differential analysis of the HBT radius parameters as a function of the mean transverse pair momentum k_perp allowed to determine transverse geometrical source sizes of about 5.5 fm to 7 fm, increasing with energy and centrality. The mean transverse flow velocity v_perp was found to be of the order 0.5--0.6 c. For the freeze-out time tau_f values between 6 and 8 fm/c were obtained with a duration of particle emission compatible with zero. The beam energy dependence of the HBT radii provide evidence for a universal pion freeze-out condition. The analyzed data have been recorded with the CERES spectrometer at the Super Proton Synchrotron (SPS) accelerator at CERN. |
id | cern-1497280 |
institution | Organización Europea para la Investigación Nuclear |
publishDate | 2002 |
record_format | invenio |
spelling | cern-14972802019-09-30T06:29:59Zhttp://cds.cern.ch/record/1497280Tilsner, HeinzTwo-particle correlations at 40, 80, and 158 AGeV Pb - Au collisionsParticle Physics - ExperimentIn this thesis, a centrality dependent study of tow-particle momentum correlations of like-sign pions (HBT interferometry) from Pb-Au collisions at beam energies of 40, 80 and 158 AGeV is presented. The three-dimensional correlation function C_2, depending on the relative momentum components of the particle pair, was parameterized using a three-dimensional Gaussian, modified to consider the final state Coulomb repulsion. The parameterization was done in the Cartesian out-side-long system as proposed by G. Bertsch and S. Pratt. A differential analysis of the HBT radius parameters as a function of the mean transverse pair momentum k_perp allowed to determine transverse geometrical source sizes of about 5.5 fm to 7 fm, increasing with energy and centrality. The mean transverse flow velocity v_perp was found to be of the order 0.5--0.6 c. For the freeze-out time tau_f values between 6 and 8 fm/c were obtained with a duration of particle emission compatible with zero. The beam energy dependence of the HBT radii provide evidence for a universal pion freeze-out condition. The analyzed data have been recorded with the CERES spectrometer at the Super Proton Synchrotron (SPS) accelerator at CERN.CERN-THESIS-2002-063oai:cds.cern.ch:14972802002 |
spellingShingle | Particle Physics - Experiment Tilsner, Heinz Two-particle correlations at 40, 80, and 158 AGeV Pb - Au collisions |
title | Two-particle correlations at 40, 80, and 158 AGeV Pb - Au collisions |
title_full | Two-particle correlations at 40, 80, and 158 AGeV Pb - Au collisions |
title_fullStr | Two-particle correlations at 40, 80, and 158 AGeV Pb - Au collisions |
title_full_unstemmed | Two-particle correlations at 40, 80, and 158 AGeV Pb - Au collisions |
title_short | Two-particle correlations at 40, 80, and 158 AGeV Pb - Au collisions |
title_sort | two-particle correlations at 40, 80, and 158 agev pb - au collisions |
topic | Particle Physics - Experiment |
url | http://cds.cern.ch/record/1497280 |
work_keys_str_mv | AT tilsnerheinz twoparticlecorrelationsat4080and158agevpbaucollisions |