Measuring the Charged Particle Multiplicity with ALICE

Details Measuring the Charged Particle Multiplicity with ALICE Measuring the Charged Particle Multiplicity with ALICE

2008-08-19

arxiv.org/abs/0808.2590v1

Indian J.Phys.85:93-97,2011

Physics

High Energy Physics

High Energy Physics - Experiment

Proceedings of poster presentation at Quark Matter 2008, 20th International Conference on Ultra-Relativistic Nucleus-Nucleus C

Scientific paper

10.1007/s12648-011-0024-8

The charged particle multiplicity distribution is one of the first measurements that ALICE will be able to perform. The knowledge of this basic property at a new energy is needed to configure Monte Carlo generators correctly with the aim of understanding the background of other, especially rare, processes including new physics. It allows to study the scaling behaviour and to verify model predictions. The unfolding of the measurement is a non-trivial task due to the finite precision and acceptance of the detector. Solutions are based on chi2 minimization or iteratively using Bayes' theorem. Both approaches to unfold the spectrum are presented. Furthermore, the capabilities of the SPD fast OR trigger are shown that enable physics at very high multiplicities.

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