Determination of the total $c\bar c$ production cross section in 340 GeV/c $\Sigma^-$ -nucleus interactions

M.I. Adamovich et al.,Yu A Alexandrov, D Barberis,Michael W Beck, C Berat,W Beusch,M Boss, S Brons,W Bruckner,M Buenerd,C Busch,C Buscher, F Charignon, J Chauvin, E Chudakov,U Dersch, F Dropmann, J Engelfried,F Faller,A Fournier,S G Gerassimov, M Godbersen, P Grafstrom,Th Haller,Marko Heidrich, E Hubbard,R Hurst,K Konigsmann,I Konorov,N Keller,K Martens,Philippe Martin, S Masciocchi,R Michaels,U Muller, H Neeb,Dave M Newbold, C R Newsom,S Paul, J Pochodzalla, I K Potashnikova,B Povh,R D Ransome,Zhongliang Ren, M Reycampagnolle, G Rosner,L P Rossi, H Rudolph, C Scheel,L Schmitt,H W Siebert, A Simon,V J Smith,O Thilmann, A Trombini, E Vesin, B Volkemer,K Vorwalter,Th Walcher, G Walder, R Werding,E Wittmann, M Zavertyaev

European Physical Journal C（2000）

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摘要

The production of charmed particles by 340 GeV/c momentum Sigma(-) was studied in the hyperon beam experiment WA89 at the CERN-SPSI using the Omega-spectrometer. In two data-taking periods in 1993 and 1994 an integrated luminosity of 1600 mu b(-1) on copper and carbon targets was recorded. From the reconstruction of 930 +/- 90 charm particle decays in 10 decay channels production cross sections for D! D, D-s(-) and Lambda(c)(+) were determined in the region x(F) > 0. Assuming an Al dependence of the cross section on the nucleon number, we calculate a total c (c) over bar production cross section of sigma(c (c) over bar)(x(F) > 0) = 5.3 +/- 0.4 (stat) +/- 1.0 (syst) + 1.0 (Xi(c)) mu b per nucleon. The last term is an upper limit on the unknown contribution from charmed-strange baryon production.

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关键词

Copper, Production Cross, Total Production, Production Cross Section, Decay Channel

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