Event Texture Search for Critical Fluctuations in Pb+Pb Collisions

Details Event Texture Search for Critical Fluctuations in Pb+Pb Collisions Event Texture Search for Critical Fluctuations in Pb+Pb Collisions

2001-04-02

arxiv.org/abs/nucl-ex/0104002v1

Nucl.Phys. A698 (2002) 651-654

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 4 figures, a talk at the Quark Matter 2001 parallel session III-B (Stony Brook, January 2001)

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, by simultaneous localization of features in space and scale. Scanning a broad range of multiplicities, we look for a possible critical behaviour in the power spectra of local density fluctuations. The data are compared with detailed simulations of detector response, 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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