Determination of the Total c ¯ c Production Cross Section in 340 GeV /c Σ − -Nucleus Interactions
Determination of the Total c ¯ c Production Cross Section in 340 GeV /c Σ − -Nucleus Interactions
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. The production of charmed particles by Σ − of 340 GeV /c momentum was studied in the hyperon beam experiment WA89 at the CERN-SPS, using the Ω -spectrometer. In two data-taking periods in 1993 and 1994 an integrated luminosity of 1600 µ 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 Λ +c were determined in the region x F > 0. Assuming an A 1 dependence of the cross section on the nucleon number, we calculate a total c ¯ c production cross section of σ cc ( x F > 0) = 5 . 3 ± 0 . 4 ( stat ) ± 1 . 0 ( syst ) + 1 . 0 (Ξ c ) µ b per nucleon. The last term is an upper limit on the unknown contribution from charmed-strange baryon production.