Neutral charm production in 400 GeV proton-emulsion interactions

Aziz, T. ; Ahmad, S. ; Ahrar, H. ; Beri, S. B. ; Bhatia, V. S. ; Ganguli, S. N. ; Gupta, S. K. ; Gupta, V. K. ; Gurtu, A. ; Irfan, M. ; Malhotra, P. K. ; et. , al (1984) Neutral charm production in 400 GeV proton-emulsion interactions Zeitschrift für Physik C Particles and Fields, 26 (1). pp. 13-18. ISSN 0170-9739

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A search has been carried out for neutral charm production in 5,108 proton-emulsion interactions at 400 GeV/c. Nine charm candidates have been observed in our fiducial volume which extends from 100µm-1,000µm in the forward cone. One of these is a 4-prong and the others are 2-prong events with opening angle>10 mrad and momenta of both decay tracks>150 MeV/c. Search for associated charm decays was made in an extended fiducial volume around the primary stars of these nine candidates. This yielded two neutral 2-prong events, one associated with the 4-prong and the other with a 2-prong candidate. All unassociated candidates are consistent with being backgrounds due to K s , Λ decays, neutral interactions and γ conversions whereas the background to associated events is negligible. Based on the two associated decays the inclusive cross section for D 0, -0 production is determined as 27±20 µb/nucleon. Detailed measurements on the 4-prong candidate lead to the identification of one decay track as an electron and another as a kaon. This is interpreted as a semi-leptonic, Cabbibo favoured D 0/D -0 decay.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
ID Code:15031
Deposited On:13 Nov 2010 13:06
Last Modified:31 May 2011 09:39

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