Observation of the Doubly Charmed Baryon ${\mathrm{Ξ}}_{cc}^{++}$ 11.09.2017 by Kaido Reivelt Author(s): R. Aaij et al. (LHCb Collaboration) High-precision experiments at CERN find a new baryon containing two charm quarks. [Phys. Rev. Lett. 119, 112001] Published Mon Sep 11, 2017