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Study of Bc+ decays to charmonia and three light hadrons
R Aaij, ASW Abdelmotteleb, C Abellán Beteta, FJ Abudinen Gallego, T Ackernley, B Adeva, M Adinolfi, H Afsharnia, C Agapopoulou, CA Aidala, S Aiola, Z Ajaltouni, S Akar, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, Z Aliouche, G Alkhazov, Paula Alvarez Cartelle, S Amato, JL Amey, Y Amhis, L An, L Anderlini, A Andreianov, M Andreotti, F Archilli, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, M Bachmayer, JJ Back, P Baladron Rodriguez, V Balagura, W Baldini, J Baptista Leite, M Barbetti, RJ Barlow, S Barsuk, W Barter, M Bartolini, F Baryshnikov, JM Basels, S Bashir, G Bassi, B Batsukh, A Battig, A Bay, A Beck, M Becker, F Bedeschi, I Bediaga, A Beiter, V Belavin, S Belin, V Bellee, K Belous, I Belov, I Belyaev, G Bencivenni, E Ben-Haim, A Berezhnoy, R Bernet, D Berninghoff, HC Bernstein, C Bertella, A Bertolin, C Betancourt, F Betti, I Bezshyiko, S Bhasin, J Bhom, L Bian, MS Bieker, S Bifani, P Billoir, A Biolchini, M Birch, FCR Bishop, A Bitadze, A Bizzeti, M Bjørn, MP Blago, T Blake, F Blanc, S Blusk, D Bobulska, JA Boelhauve, O Boente Garcia, T Boettcher, A Boldyrev, A Bondar, N Bondar, S Borghi, M Borisyak
OAI: oai:www.repository.cam.ac.uk:1810/333054 • DOI: 10.17863/CAM.80478
Abstract
Using proton-proton collision data, corresponding to an integrated luminosity
of $9fb^{-1}$ collected with the LHCb detector, seven decay modes of the
$B_c^+$ meson into a $J/\psi$ or $\psi(2S)$ meson and three charged hadrons,
kaons or pions, are studied. The decays $B_c^+\rightarrow ( \psi(2S)
\rightarrow J/\psi \pi^+ \pi^-)\pi^+ $, $B_c^+\rightarrow
\psi(2S)\pi^+\pi^+\pi^-$, $B_c^+\rightarrow J/\psi K^+\pi^+\pi^-$ and
$B_c^+\rightarrow K^+K^+K^-$ are observed for the first time, and evidence for
the $B_c^+\rightarrow \psi(2S)K^+K^-\pi^+$ decay is found, where $J/\psi$ and
$\psi(2S)$ mesons are reconstructed in their dimuon decay modes. The ratios of
branching fractions between the different $B_c^+$ decays are reported as well
as the fractions of the decays proceeding via intermediate resonances. The
results largely support the factorisation approach used for a theoretical
description of the studied decays.