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Neutral charm production in 400 GeV proton-emulsion interactions |
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| Authors: | T Aziz S Ahmad H Ahrar S B Beri V S Bhatia S N Ganguli S K Gupta V K Gupta A Gurtu M Irfan R R Joseph G L Kaul Manjit Kaur S Kumar P K Malhotra L K Mangotra I S Mittra Y Prakash N K Rao M Shafi M Shyam S K Tuli |
| Institution: | 1. Tata Institute of Fundamental Research, 400005, Bombay, India 2. Physics Department, AMU, 202001, Aligarh, India 3. Physics Department, Panjab University, 160014, Chandigarh, India 4. Physics Department, Jammu University, 180001, Jammu Tawi, India 5. Physics Department, BHU, 221005, Varanasi, India |
| Abstract: | 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 100 μm-1,000 μm 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 toK 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 forD 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 favouredD 0/D ?0 decay. |
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