Charm production in 400 GeV/c proton-emulsion interactions: Bombay-Chandigarh-Delhi-Jammu Collaboration |
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Authors: | T Aziz RR Daniel SN Ganguli A Gurtu PK Malhotra MM Aggarwal SB Beri VS Bhatia IS Mittra Gurmukh Singh NS Arya DP Goyal A Mozumder PK Sengupta S Singh S Kumar GL Kaul LK Mangotra G Singh |
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Institution: | 1. Tata Institute of Fundamental Research, Bombay 400005, India;2. Physics Department, Panjab University, Chandigarh 160 014, India;3. Department of Physics and Astrophysics, University of Delhi, Delhi 110 007, India |
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Abstract: | 5032 proton-emulsion interactions at 400 GeV/c momentum have been carefully scrutinized for production and decay of charged charm particles. In order to detect these decays, shower tracks from 3056 stars have been followed to a maximum length of 1 mm and those from 1976 stars up to 2 mm. A total of 23 three-prong charm-like candidates have been recorded in the forward cone. The background due to γ-overlap on a shower track, trident/pseudo-trident production and secondary interactions is estimated to be 15. Attributing the signal of 8 events to Λc+ and assuming the branching ratio of Λc+ → 3 prong to be 0.6 and τΛc to be 10?13 sec we obtain the production cross section to be 106±39μb/nucleon. Out of these 8 events one example of semileptonic decay of Λc+ is seen. |
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