Robast Methods for the RICH Ring Recognition and Particle Identification
N. Chernov a, E. Kolganova b, G. Ososkov b
of Alabama, Birmingham, AB USA
bJoint Institute for Nuclear Research, Dubna, 141980 Russia,
|Problems of direct processing of the raw RICH data are discussed. The robust technique is applied to ring fitting. It is based on a least-square method with recalculated weights depending not only on the distance of a pad from the fitted circle but also on the signal amplitude of the pad. The proposed method leads to reliable parameter reconstruction from raw data for a single ring, as well as for two overlapping rings. Computed ring parameters are then successfully used for the particle identification.
Key words: RICH detector; raw data; circle fitting; particle identification; robust method; optimal weight functions