The two sample is clearly separable in angle space. All tracks are followed down and vertex positions are predicted if a track is not found in two consecutive plates. It allows distortion free angle measurement over the base and detection of a possible kink automatically which reduces the amount of manual scan. A kink is defined as either an angle change larger than 30 mrad in the track or disappearance of the track in vertex plate. Daughter tracks with large angles will be out of scanning acceptance and track will not be found.
Similar topology occurs if there is an inelastic interaction instead of an elastic one with kink.
In many cases tracks emerging from the interaction vertex will not be detected due to scanning angle acceptance and no visible track will be seen by the microscope in emulsion after the interaction point. Manual scanning is performed to determine the type of interaction for those tagged as interaction in the previous procedure. All the daughter tracks of white and black kinks are tracked downstream to CET for the momentum measurement. 19 kink events are detected in the scanned area over 110 target plates. Effort is spent for more precise momentum measurement at present.