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Observation of Λb0→ ψ(2S)pKand Λb0→ J/ψπ+πpKdecays and a measurement of the Λb0baryon mass

  • Author(s): The LHCb collaboration
  • Aaij, R
  • Abellán Beteta, C
  • Adeva, B
  • Adinolfi, M
  • Affolder, A
  • Ajaltouni, Z
  • Akar, S
  • Albrecht, J
  • Alessio, F
  • Alexander, M
  • Ali, S
  • Alkhazov, G
  • Alvarez Cartelle, P
  • Alves, AA
  • Amato, S
  • Amerio, S
  • Amhis, Y
  • An, L
  • Anderlini, L
  • Andreassi, G
  • Andreotti, M
  • Andrews, JE
  • Appleby, RB
  • Aquines Gutierrez, O
  • Archilli, F
  • d’Argent, P
  • Artamonov, A
  • Artuso, M
  • Aslanides, E
  • Auriemma, G
  • Baalouch, M
  • Bachmann, S
  • Back, JJ
  • Badalov, A
  • Baesso, C
  • Baldini, W
  • Barlow, RJ
  • Barschel, C
  • Barsuk, S
  • Barter, W
  • Batozskaya, V
  • Battista, V
  • Bay, A
  • Beaucourt, L
  • Beddow, J
  • Bedeschi, F
  • Bediaga, I
  • Bel, LJ
  • Bellee, V
  • Belloli, N
  • Belyaev, I
  • Ben-Haim, E
  • Bencivenni, G
  • Benson, S
  • Benton, J
  • Berezhnoy, A
  • Bernet, R
  • Bertolin, A
  • Betti, F
  • Bettler, MO
  • van Beuzekom, M
  • Bifani, S
  • Billoir, P
  • Bird, T
  • Birnkraut, A
  • Bizzeti, A
  • Blake, T
  • Blanc, F
  • Blouw, J
  • Blusk, S
  • Bocci, V
  • Bondar, A
  • Bondar, N
  • Bonivento, W
  • Borgheresi, A
  • Borghi, S
  • Borisyak, M
  • Borsato, M
  • Bowcock, TJV
  • Bowen, E
  • Bozzi, C
  • Braun, S
  • Britsch, M
  • Britton, T
  • Brodzicka, J
  • Brook, NH
  • Buchanan, E
  • Burr, C
  • Bursche, A
  • Buytaert, J
  • Cadeddu, S
  • Calabrese, R
  • Calvi, M
  • Calvo Gomez, M
  • Campana, P
  • Campora Perez, D
  • Capriotti, L
  • Carbone, A
  • Carboni, G
  • et al.

Published Web Location

http://doi.org/10.1007/JHEP05(2016)132
No data is associated with this publication.
Abstract

© 2016, The Author(s). Abstract: The decays Λb0→ ψ(2S)pK−and Λb0→ 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 Λb0→ J/ψpK−are measured to beℬ(Λb0→ψ(2S)pK−)/ℬ(Λb0→J/ψpK−)=(20.70±0.76±0.46±0.37)×10−2, ℬ(Λb0→ψ(2S)pK−)/ℬ(Λb0→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 Λb0baryon is measured to be M(Λb0)=5619.65±0.17±0.17MeV/c2, where the uncertainties are statistical and systematic.

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