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arXiv · hep-ex/9808007

Reconstruction and Particle Identification for a DIRC System

M. Benayoun·L. Del Buono·Ph. Leruste
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Abstract

We study the reconstruction and particle identification (PID) problem for Ring Imaging devices providing a good knowledge of the direction of the Cerenkov photons, as the DIRC system, on which we specialize. We advocate first the use of the stereographic projection as a tool allowing a suitable representation of the photon data, as it allows to represent the Cerenkov cone always as a circle. We set up an algorithm able to perform reliably a fit of circle arcs of small angular opening, by minimising a true Chi2 expression. The system we develop for PID relies on this algorithm and on a procedure able to remove background photons with a high efficiency. We thus show that, even when the background is large, it is possible to perform an efficient PID by means of a fit algorithm which finally provides all the circle parameters; these are connected with the charged track direction and its Cerenkov angle. It is shown that background effects can be dealt without spoiling significantly the reconstruction probability distributions.

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M. Benayoun, L. Del Buono, Ph. Leruste. 1998-08-10. Reconstruction and Particle Identification for a DIRC System. https://doi.org/10.1016/s0168-9002(99)00019-4

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