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Etude de la production d'étrangeté dans les collisions d'ions lourds ultra-relativistes à 130 GeV par paire de nucléons avec l'expérience STAR au RHIC

Abstract : Strangeness production is one of the major probes to identify a deconfined phase of partons in relativistic heavy ion collisions. Among the new experiments which started at RHIC, STAR (Solenoidal Tracker At RHIC) offers important possibilities for what is related to multi-strange particle reconstruction such as Omegas and the hypothetical H0 dibaryon. We have discussed the main motivations of this kind of studies in the context of various models as well as earlier experiments. The analysis of first year data taking of STAR with collisions at 130 GeV per pair of nuclei in the center of mass and the setting of optimized selections has allowed to obtain a relevant signal of Omega and anti-Omega particles. For what is related to the H0 search, no significant signal has been observed so far. Using simulations, it has been possible to estimate the efficiency in the detection of strange particles and establish the sensitivity of STAR for the reconstruction of one of the assumed decay modes of the H0 which is of 0.39 H0 per event for the set of data taken during the first year. Furthermore, the efficiency of our selections has allowed for the extraction of the anti-particle to particle ratio (0.95 +/- 0.15), for the corrected yields dN/dy= 0.64 +/- 0.14 and the related inverse slope parameter T= 411 +/- 44 MeV. These results, which have a important statistical uncertainty, are compatible with numerous theoretical predictions. They do not permit to conclude if a quark gluon plasma has been reached or not.
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https://tel.archives-ouvertes.fr/tel-00003613
Contributor : Boris Hippolyte <>
Submitted on : Wednesday, October 22, 2003 - 6:06:03 AM
Last modification on : Monday, February 1, 2021 - 11:24:02 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:42:41 PM

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  • HAL Id : tel-00003613, version 1

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Boris Hippolyte. Etude de la production d'étrangeté dans les collisions d'ions lourds ultra-relativistes à 130 GeV par paire de nucléons avec l'expérience STAR au RHIC. Physique Nucléaire Théorique [nucl-th]. Université Louis Pasteur - Strasbourg I, 2002. Français. ⟨tel-00003613⟩

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