Observation of double charm production involving open charm in pp collisions at s=7 TeV
Abstract
The production of J/ 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/ and open charm cross-sections. The properties of these events are studied and compared to theoretical predictions.
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