arxiv: 1205.0975 · v3 · submitted 2012-05-04 · ✦ hep-ex
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Observation of double charm production involving open charm in pp collisions at sqrt{s}=7 TeV
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The production of $J/\psi$ mesons accompanied by open charm, and of pairs of open charm hadrons are observed in pp collisions at a centre-of-mass energy of 7 TeV using an integrated luminosity of $355pb^{-1}$ collected with the LHCb detector. Model independent measurements of absolute cross-sections are given together with ratios to the measured $J/\psi$ and open charm cross-sections. The properties of these events are studied and compared to theoretical predictions.
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