Observation of double charm production involving open charm in pp collisions at $\sqrt{s}$=7 TeV
arXiv:1205.0975 · doi:10.1007/JHEP06(2012)141
Abstract
The production of $J/Ï$ 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 $J/Ï$ and open charm cross-sections. The properties of these events are studied and compared to theoretical predictions.
41 pages, 20 figures