Charm Estimate from the Dilepton Spectra

Details Charm Estimate from the Dilepton Spectra Charm Estimate from the Dilepton Spectra

2000-03-31

arxiv.org/abs/hep-ph/0003319v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

revised version to be published in J. Phys. G

Scientific paper

A validity of a recent estimate of an upper limit of charm production in central Pb+Pb collisions at 158 AGeV is critically discussed. Within a simple model we study properties of the background subtraction procedure used for an extraction of the charm signal from the analysis of dilepton spectra. We demonstrate that a production asymmetry between positively and negatively charged background muons and a large multiplicity of signal pairs leads to biased results. Therefore the applicability of this procedure for the analysis of nucleus-nucleus data should be reconsidered before final conclusions on the upper limit estimate of charm production could be drawn.

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