Abstract
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.
Original language | English |
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Article number | 132 |
Journal | Journal of High Energy Physics |
Volume | 2016 |
Issue number | 5 |
DOIs | |
Publication status | Published - 1 May 2016 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2016, The Author(s).
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics