Description: A search for charmed D mesons was made with a 217 GeV ..pi../sup -/ beam on a liquid hydrogen target. The Chicago Cyclotron Spectrometer at Fermilab was used to analyze the hadronic decay of a D meson in coincidence with a prompt muon and a recoil proton. A total of 50 +- 12 D/sup + -/ events were observed with equal numbers in the two channels K/sup + -/..pi../sup - +/..pi../sup - +/. Some of the cuts selected diffractive events. When these cuts were removed the signal remained the same, although the background was greatly increased. The Feynman X and angular distributions were consistent with diffractive production. A diffractive model yielded a cross section of (6 to 10) +- 4 ..mu..b.
Date: January 1, 1980
Creator: Koester, L.J.; Alverson, G. & Ascoli, G.
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