Charm D-meson production in 360 GeV pp interactions has been studied using the high-resolution hydrogen bubble chamber LEBC and the European Hybrid Spectrometer. D-mesons are produced with a differential cross section of the form d 2 σ d x d p T 2 δ(1-x) n exp (-ap T 2 ) , with n =1.8± 0.8 and a =1.1±0.03 GeV/ c −2 for the Feynman x and Transverse momentum p T behaviour. The inclusive partle prticle crossssection for D and D̄;measured to be: σ(D/ D ̄ ) = (56 −12 25 μ b (for all x ). The Λ c D ̄ cross section can be estimated to be ≈20 μ b. No strong correlation is observed between DD̄ pairs. The results are compared with results from a study of D-meaon production in 360 GeV/ c π − p interactions also using LEBC-EHS.
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A measurement is presented of inclusive charged D*(2010) production from nonresonant e+e− annihilation in the center-of-mass energy (W) range 10.2 GeV
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The production of the charmed meson state D*+ has been observed in e+e− annihilation at 29 GeV. The fragmentation function for charmed quarks appears to be peaked about z=0.5.
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UPDATED RESULT REPORTED AS PRELIMINARY IN G. TRILLING, PARIS CONFERENCE 1982.
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