Observation of the suppressed decay Λb 0 → pπ μ + μ

R. Aaij, B. Adeva, M. Adinolfi, 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. Anderlini, G. Andreassi, M. Andreotti, J. E. AndrewsR. B. Appleby, F. Archilli, P. d’Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, I. Babuschkin, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, S. Baker, W. Baldini, R. J. Barlow, C. Barschel, S. Bifani, G. Chatzikonstantinidis, N. Farley, P. Griffith, C. Lazzeroni, A. Mazurov, J. McCarthy, A. Sergi, N. K. Watson, M. P. Williams, T. Williams, K. A. Zarebski, LHCb Collaboration

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Abstract

The suppressed decay Λb 0 → pπμ+μ, excluding the J/ψ and ψ(2S) → μ+μ resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 fb−1 collected with the LHCb experiment. The Λb 0 → pπμ+μ branching fraction is measured relative to the Λb 0 → J/ψ(→μ+μ)pπ branching fraction givingℬ(Λb0→pπ−μ+μ−)ℬ(Λb0→J/ψ(→μ+μ−)pπ−)=0.044±0.012±0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b → d transition in a baryonic decay.[Figure not available: see fulltext.]

Original languageEnglish
Article number29
JournalJournal of High Energy Physics
Volume2017
Issue number4
DOIs
Publication statusPublished - 6 Apr 2017

Keywords

  • B physics
  • Branching fraction
  • Flavour Changing Neutral Currents
  • Hadron-Hadron scattering (experiments)
  • Rare decay

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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