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

Resultado de la investigaciónrevisión exhaustiva

16 Citas (Scopus)

Resumen

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.

Idioma originalEnglish
Número de artículo132
PublicaciónJournal of High Energy Physics
Volumen2016
N.º5
DOI
EstadoPublished - 1 may 2016
Publicado de forma externa

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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.

Citar esto