Charm production in 400 GeV/c proton-emulsion interactions

Aziz, T. ; Daniel, R. R. ; Ganguli, S. N. ; Gurtu, A. ; Malhotr, P. K. ; Aggarwal, M. M. ; Beri, S.B. ; Bhatia, V. S. ; Mittra, I. S. ; Gurmukh, Singh ; Arya, N. S. ; Goyal, D. P. ; Mozumder, A. ; Sengupta, P. K. ; Singh, S. ; Kumar, S. ; Kaul, G. L. ; Mangotra, L. K. ; Prakash, Y. ; Rao, N. K. ; Singh, G. (1982) Charm production in 400 GeV/c proton-emulsion interactions Nuclear Physics B, 199 (3). pp. 424-440. ISSN 0550-3213

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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 tΛc 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.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:32021
Deposited On:30 Mar 2011 11:32
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