Fast algorithms for ring recognition and electron identification in the CBM RICH detector

The algorithm for recognition of Cherenkov radiation rings based on the Hough Transform Method (HTM), as well as the innovations which allow one to considerably speed up the HTM algorithm, are described. An ellipse-fitting algorithm has been elaborated, because most of the CBM RICH rings have elliptic shapes; moreover, it helps improve the ring-track matching and electron identification procedures. An elaborated procedure of the radius correction is also presented. A detailed study of the procedure of fake ring elimination by artificial neural networks is given. The results of the primary electron identification are presented. All developed algorithms were tested on large statistics of simulated events and are included into the CBM software framework for common use.