First observation of the doubly charmed baryon decay $Ξ_{cc}^{++}\rightarrow Ξ_{c}^{+}π^{+}$
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Adeva, B.
name: Adinolfi, M.
name: Aidala, C. A.
name: Ajaltouni, Z.
name: Akar, S.
name: Albicocco, P.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Albero, A. Alfonso
name: Ali, S.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amerio, S.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Andreassi, G.
name: Andreotti, M.
name: Andrews, J. E.
name: Appleby, R. B.
name: Archilli, F.
name: d'Argent, P.
name: Romeu, J. Arnau
name: Artamonov, A.
name: Artuso, M.
name: Arzymatov, K.
name: Aslanides, E.
name: Atzeni, M.
name: Audurier, B.
name: Bachmann, S.
name: Back, J. J.
name: Baker, S.
name: Balagura, V.
name: Baldini, W.
name: Baranov, A.
name: Barlow, R. J.
name: Barsuk, S.
name: Barter, W.
name: Baryshnikov, F.
name: Batozskaya, V.
name: Batsukh, B.
name: Battista, V.
name: Bay, A.
name: Beddow, J.
name: Bedeschi, F.
name: Bediaga, I.
name: Beiter, A.
name: Bel, L. J.
name: Belin, S.
name: Beliy, N.
name: Bellee, V.
name: Belloli, N.
name: Belous, K.
name: Belyaev, I.
name: Ben-Haim, E.
name: Bencivenni, G.
name: Benson, S.
name: Beranek, S.
name: Berezhnoy, A.
name: Bernet, R.
name: Berninghoff, D.
name: Bertholet, E.
name: Bertolin, A.
name: Betancourt, C.
name: Betti, F.
name: Bettler, M. O.
name: van Beuzekom, M.
name: Bezshyiko, Ia.
name: Bhasin, S.
name: Bhom, J.
name: Bifani, S.
name: Billoir, P.
name: Birnkraut, A.
name: Bizzeti, A.
name: Bjørn, M.
name: Blago, M. P.
name: Blake, T.
name: Blanc, F.
name: Blusk, S.
name: Bobulska, D.
name: Bocci, V.
name: Garcia, O. Boente
name: Boettcher, T.
name: Bondar, A.
name: Bondar, N.
name: Borghi, S.
name: Borisyak, M.
name: Borsato, M.
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name: Xu, Z.
name: Yang, Z.
name: Yang, Z.
name: Yao, Y.
name: Yeomans, L. E.
name: Yin, H.
name: Yu, J.
name: Yuan, X.
name: Yushchenko, O.
name: Zarebski, K. A.
name: Zavertyaev, M.
name: Zhang, D.
name: Zhang, L.
name: Zhang, W. C.
name: Zhang, Y.
name: Zhelezov, A.
name: Zheng, Y.
name: Zhu, X.
name: Zhukov, V.
name: Zonneveld, J. B.
name: Zucchelli, S.
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The doubly charmed baryon decay $Ξ_{cc}^{++} \rightarrow Ξ_{c}^{+} π^{+}$ 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 $1.7\,\mathrm{fb}^{-1}$, collected by the LHCb experiment in $pp$ collisions at a center-of-mass energy of $13\mathrm{\,Te\kern -0.1em V}$. The $Ξ_{cc}^{++}$ mass is measured to be \begin{equation}\nonumber 3620.6\pm 1.5~(\text{stat})\pm 0.4~(\text{syst}) \pm 0.3~(Ξ_{c}^{+})~\text{MeV}/\it{c}^{2}, \end{equation} and is consistent with the previous result. The ratio of branching fractions between the decay modes is measured to be \begin{equation}\nonumber \frac{\mathcal{B} (Ξ_{cc}^{++} \rightarrow Ξ_{c}^{+} π^{+}) \times \mathcal{B}(Ξ_{c}^{+} \rightarrow pK^{-}π^{+})} {\mathcal{B} (Ξ_{cc}^{++} \rightarrow Λ_c^{+} K^{-} π^{+} π^{+}) \times \mathcal{B}(Λ_c^{+} \rightarrow pK^{-}π^{+})} = 0.035\pm 0.009~(\text{stat}) \pm 0.003~(\text{syst}). \end{equation}
description: All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-026.html