Observation of Λ<inf>b</inf><sup>0</sup>→ ψ(2S)pK<sup>−</sup>and Λ<inf>b</inf><sup>0</sup>→ J/ψπ<sup>+</sup>π<sup>−</sup>pK<sup>−</sup>decays and a measurement of the Λ<inf>b</inf><sup>0</sup>baryon mass

The LHCb collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. AnderliniG. Andreassi, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, P. d’Argent, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, V. Battista, A. Bay, L. Beaucourt, J. Beddow, F. Bedeschi, I. Bediaga, L. J. Bel, V. Bellee, N. Belloli, I. Belyaev, E. Ben-Haim, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, A. Bertolin, F. Betti, M. O. Bettler, M. van Beuzekom, S. Bifani, P. Billoir, T. Bird, A. Birnkraut, A. Bizzeti, T. Blake, F. Blanc, J. Blouw, S. Blusk, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, A. Borgheresi, S. Borghi, M. Borisyak, M. Borsato, T. J.V. Bowcock, E. Bowen, C. Bozzi, S. Braun, M. Britsch, T. Britton, J. Brodzicka, N. H. Brook, E. Buchanan, C. Burr, A. Bursche, J. Buytaert

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Abstract

Abstract: The decays Λ b 0→ ψ(2S)pK and Λ b 0→ J/ψπ +π pK are observed in a data sample corresponding to an integrated luminosity of 3 fb −1, collected in proton-proton collisions at 7 and 8 TeV centre-of-mass energies by the LHCb detector. The ψ(2S) mesons are reconstructed through the decay modes ψ(2S) → μ +μ and ψ(2S) → J/ψπ +π . The branching fractions relative to that of Λ b 0→ J/ψpK are measured to beℬ(Λ b 0→ψ(2S)pK )/ℬ(Λ b 0→J/ψpK )=(20.70±0.76±0.46±0.37)×10 −2, ℬ(Λ b 0→ψ(2S)pK )/ℬ(Λ b 0→J/ψpK )=(20.86±0.96±1.34)×10 −2 where the first uncertainties are statistical, the second are systematic and the third is related to the knowledge of J/ψ and ψ(2S) branching fractions. The mass of the Λ b 0baryon is measured to be M(Λ b 0)=5619.65±0.17±0.17MeV/c 2, where the uncertainties are statistical and systematic.

Original languageEnglish
Article number132
JournalJournal of High Energy Physics
Volume2016
Issue number5
DOIs
Publication statusPublished - 1 May 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016, The Author(s).

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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