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  • First Observation of the Doubly Charmed Baryon Decay Ξ_{cc}^{++}→Ξ_{c}^{+}π^{+}
    Ajaltouni, Z; Ali, S; Arnau Romeu, J; Artuso, M; Batozskaya, V; Bay, A; Bel, L J; Benson, S; Berezhnoy, A; Bjørn, M; Boente Garcia, O; Brossa Gonzalo, A; Buchanan, E; Cadeddu, S; Calvo Gomez, M; Cardini, A; Chatzikonstantinidis, G; Chefdeville, M; Cogneras, E; Colombo, T; Cowan, G A; De Aguiar Francisco, O; De Miranda, J M; Dembinski, H-P; Dreimanis, K; Dziurda, A; Egede, U; Farry, S; Funk, W; Gerstel, D; Gizdov, K; Gligorov, V V; Gorelov, I V; Haen, C; Han, X; Harnew, N; Harnew, S T; Harrison, T; Henry, L; Hidalgo Charman, R; Hilton, M; Hopchev, P H; Kozeiha, M; Krupa, W; Lesiak, T; Liu, X; Loh, D; Lupato, A; Maddrell-Mander, S; Maisuzenko, D; Majewski, M W; Mancinelli, G; Marino, P; Marks, J; Martinez Santos, D; McNulty, R; Michielin, E; Mitzel, D S; Monteil, S; Moron, J; Mountain, R; Müller, J; Nakada, T; Nanut, T; O'Hanlon, D P; Onderwater, C J G; Palano, A; Panshin, G; Pearce, A; Polycarpo, E; Popov, A; Qian, W; Ramos Pernas, M; Reichert, S; Sanchez Mayordomo, C; Satriano, C; Satta, A; Saur, M; Schmelzer, T; Schreiner, H F; Siddi, B G; Souza De Paula, B; Stagni, F; Stevens, H; Stramaglia, M E; T'Jampens, S; Tuci, G; Usachov, A; Vagnoni, V; Vazquez Regueiro, P; Veronika, N V; Vilasis-Cardona, X; Vollhardt, A; Weiden, A; Wicht, J; Wotton, S A; Xu, Q; Yang, Z; Zhang, D; Zonneveld, J B

    Physical review letters, 2018-Oct-19, Letnik: 121, Številka: 16
    Journal Article

    The doubly charmed baryon decay Ξ_{cc}^{++}→Ξ_{c}^{+}π^{+} is observed for the first time, with a statistical significance of 5.9σ, confirming a recent observation of the baryon in the Λ_{c}^{+}K^{-}π^{+}π^{+} final state. The data sample used corresponds to an integrated luminosity of 1.7  fb^{-1}, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV. The Ξ_{cc}^{++} mass is measured to be 3620.6±1.5(stat)±0.4(syst)±0.3(Ξ_{c}^{+})  MeV/c^{2} and is consistent with the previous result. The ratio of branching fractions between the decay modes is measured to be B(Ξ_{cc}^{++}→Ξ_{c}^{+}π^{+})×B(Ξ_{c}^{+}→pK^{-}π^{+})/B(Ξ_{cc}^{++}→Λ_{c}^{+}K^{-}π^{+}π^{+})×B(Λ_{c}^{+}→pK^{-}π^{+})=0.035±0.009(stat)±0.003(syst).

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