SEARCH FOR FRACTIONALLY CHARGED PARTICLES AND HEAVY LONG LIVED PARTICLES IN Z DECAYS
Abstract
A SEARCH FOR THE PRODUCTION OF FREE FRACTIONALLY CHARGED PARTICLES AND OF HEAVYLONG-LIVED CHARGED PARTICLES, PRODUCED IN E+E- COLLISIONS IN A SCAN OF THE Z PEAK HAS BEEN PERFORMED. THE DATA ANALYZED CORRESPOND TO 8PB-1 OF LUMINOSITY ANDWERE COLLECTED BY THE ALEPH DETECTOR AT THE E+E- COLLIDER LEP. THE ANALYSIS ISBASED ON THE MEASUREMENT OF IONIZATION ENERGY LOSS OF CHARGED TRACKS IN THE ALEPH TPC CENTRAL TRACKING DETECTOR. NO EVIDENCE HAS BEEN FOUND FOR THE PRODUCTION OF SUCH PARTICLES WITH MASSES GREATER THAN 5 GEV/C2, AND THE MASS LIMITS FOR THE PAIR PRODUCTION OF FRACTIONALLY CHARGED PARTICLES AND OF HEAVY LONG- LIVED CHARGED PARTICLES ARE EXTENDED TO 93 GEV/C2 AT 90% CONFIDENCE LEVEL. IF SINGLE PRODUCTION OF A HEAVY PARTICLE IS CONSIDERED, THE MASS LIMIT IS EXTENDED TO 70 GEV/C2. THE CANDIDATE TRACKS WITH MASS BELOW 5 GEV/C2 ARE CONSISTENT WITH THE EXPECTED BACKGROUND.
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