Observation of the Ξb →J/ψΛK decay

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, V. Balagura, W. Baldini, R. J. Barlow, S. Bifani, G. Chatzikonstantinidis, N. Farley, P. Griffith, C. Lazzeroni, A. Mazurov, L. Pescatore, A. Sergi, N. K. Watson, M. P. Williams, T. Williams, K. A. Zarebski, LHCb Collaboration

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Abstract

The observation of the decay Ξb →J/ψΛK is reported, using a data sample corresponding to an integrated luminosity of 3fb−1, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of Ξb baryons detected in the decay Ξb →J/ψΛK is measured relative to that of Λb 0 baryons using the decay Λb 0→J/ψΛ. Integrated over the b-baryon transverse momentum pT<25GeV/c and rapidity 2.0<y<4.5, the measured ratio is [Formula presented][Formula presented]=(4.19±0.29 (stat)±0.15 (syst))×10−2, where fΞb and fΛb 0 are the fragmentation fractions of b→Ξb and b→Λb 0 transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξb and Λb 0 baryons is measured to be M(Ξb )−M(Λb 0)=177.08±0.47 (stat)±0.16 (syst)MeV/c2.

Original languageEnglish
Pages (from-to)265-273
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume772
Early online date26 Jun 2017
DOIs
Publication statusPublished - 10 Sep 2017

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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