Event Texture Search for Critical Fluctuations in Pb+Pb Collisions

The NA44 Collaboration

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arXiv · nucl-ex/0104002

Event Texture Search for Critical Fluctuations in Pb+Pb Collisions

The NA44 Collaboration

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Abstract

NA44 uses a 512 channel Si pad array covering $1.5 <η< 3.3$ 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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The NA44 Collaboration. 2001-04-02. Event Texture Search for Critical Fluctuations in Pb+Pb Collisions. https://arxiv.org/abs/nucl-ex/0104002

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