Observation of the doubly charmed baryon Ξcc++. by Aaij, R, Adeva, B, Adinolfi, M, Bjoern, M, Evans, T, Gandini, P, Gruberg Cazon, B, Hadavizadeh, T, Hancock, T, Harnew, N, Hill, D, Jalocha, P, John, M, Jurik, N, Malde, S, Nandi, A, Pullen, H, Rollings, A, Topp-Joergensen, S, Veneziano, G, Vesterinen, M, Wilkinson, G, LHCb Collaboration (786 Others)