Event Texture Search for Phase Transitions in Pb+Pb Collisions

Details Event Texture Search for Phase Transitions in Pb+Pb Collisions Event Texture Search for Phase Transitions in Pb+Pb Collisions

2001-07-10

arxiv.org/abs/nucl-ex/0107007v2

Phys.Rev. C65 (2002) 044903

Physics

Nuclear Physics

Nuclear Experiment

12 pages, 8 figures, submitted to Phys.Rev.C

Scientific paper

NA44 uses a 512 channel Si pad array covering $1.5 <\eta < 3.3$ to study charged hadron production in 158 A GeV Pb+Pb collisions at the CERN SPS. We apply a multiresolution analysis, based on a Discrete Wavelet Transformation, to probe the texture of particle distributions event-by-event, allowing simultaneous localization of features in space and scale. Scanning a broad range of multiplicities, we search for signals of clustering and of critical behavior in the power spectra of local density fluctuations. The data are compared with detailed simulations of detector responce, using heavy ion event generators, and with a reference sample created via event mixing. An upper limit is set on the probability and magnitude of dynamical fluctuations.

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