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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Resumen

© 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.
Idioma originalEnglish
PublicaciónJournal of High Energy Physics
DOI
EstadoPublished - 1 may 2016
Publicado de forma externa

Huella Profundice en los temas de investigación de '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'. En conjunto forman una huella única.

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