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C.Zhang, Y.Zhelezov, A.Zhong, L.Zvyagin, A.2013-02-272013-02-272013-02-27201210.1007/Jhep06(2012)141https://infoscience.epfl.ch/handle/20.500.14299/89802WOS:000306418300050The 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 355 pb(-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.Hadron-Hadron Scatteringtext::journal::journal article::research article