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  • Observation of the doubly charmed baryon \(\Xi_{cc}^{++}\)
    collaboration, LHCb; Alves, A A; Archilli, F; Bediaga, I; Bel, L J; Belloli, N; Beranek, S; Blanc, F; Boettcher, T; Bordyuzhin, I; Britton, T; Cardinale, R; Cardini, A; Casse, G; Chefdeville, M; Chen, S; Chobanova, V; Collins, P; Corvo, M; De Serio, M; Dey, B; A Di Canto; Durante, P; Dziurda, A; Dzyuba, A; Eitschberger, U; Farry, S; A Fernandez Prieto; Frei, C; J Fu; Funk, W; Gambetta, S; R Graciani Diaz; Göbel, C; Harnew, S T; Hasse, C; Hatch, M; Heinicke, K; Hill, D; Z -C Huard; Joram, C; Ketel, T; Khanji, B; Klimkovich, T; Kurek, K; Latham, T; Z Li; Likhomanenko, T; Lisovskyi, V; Loi, A; M Lucio Martinez; Luo, H; Lupato, A; Marchand, J F; Mathad, A; Maurin, B; Melnychuk, D; J Molina Rodriguez; Mombacher, T; Monroy, I A; Morello, M J; Müller, V; Nasteva, I; Neuner, M; Nikitin, N; Ogilvy, S; Ossowska, A; Otalora Goicochea, J M; Pellegrino, A; Perret, P; Petrov, A; Poluektov, A; Prouve, C; Punzi, G; Rodriguez Lopez, J A; Roiser, S; Romanovskiy, V; Ronayne, J W; Saitta, B; Guimaraes, V Salustino; Santimaria, M; Sarpis, G; Sarti, A; Schneider, O; Sciascia, B; Sergi, A; Stahl, M; Tellarini, G; Vagner, A; Valassi, A; Vesterinen, M; Vitti, M; Vollhardt, A; Wallace, R; Ward, D R; Websdale, D; Wilkinson, G; Wilkinson, M; Zavertyaev, M; Zucchelli, S

    arXiv.org, 09/2017
    Paper

    A highly significant structure is observed in the \(\Lambda_c^+K^-\pi^+\pi^+\) mass spectrum, where the \(\Lambda_c^+\) baryon is reconstructed in the decay mode \(pK^-\pi^+\). The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon \(\Xi_{cc}^{++}\). The difference between the masses of the \(\Xi_{cc}^{++}\) and \(\Lambda_c^+\) states is measured to be \(1334.94 \pm 0.72 (\mathrm{stat}) \pm 0.27 (\mathrm{syst}~\mathrm{MeV}/c^2\), and the \(\Xi_{cc}^{++}\) mass is then determined to be \(3621.40 \pm 0.72 (\mathrm{stat}) \pm 0.27 (\mathrm{syst} \pm 0.14 \, (\Lambda_c^+)~\mathrm{MeV}/c^2\), where the last uncertainty is due to the limited knowledge of the \(\Lambda_c^+\) mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 \(\mathrm{fb}^{-1}\), and confirmed in an additional sample of data collected at 8 TeV.

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