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- W137116852 abstract "Bottom baryons decaying to a J/ψ meson and a hyperon are reconstructed using 1.0 fb−1 of data collected in 2011 with the LHCb detector. Significant Λb0→J/ψΛ, Ξb−→J/ψΞ− and Ωb−→J/ψΩ− signals are observed and the corresponding masses are measured to be M(Λb0)=5619.53±0.13(stat.)±0.45(syst.) MeV/c2, M(Ξb−)=5795.8±0.9(stat.)±0.4(syst.) MeV/c2, M(Ωb−)=6046.0±2.2(stat.)±0.5(syst.) MeV/c2, while the differences with respect to the Λb0 mass are M(Ξb−)−M(Λb0)=176.2±0.9(stat.)±0.1(syst.) MeV/c2, M(Ωb−)−M(Λb0)=426.4±2.2(stat.)±0.4(syst.) MeV/c2. These are the most precise mass measurements of the Λb0, Ξb− and Ωb− baryons to date. Averaging the above Λb0 mass measurement with that published by LHCb using 35 pb−1 of data collected in 2010 yields M(Λb0)=5619.44±0.13(stat.)±0.38(syst.) MeV/c2.Received 5 February 2013DOI:https://doi.org/10.1103/PhysRevLett.110.182001This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.© 2013 CERN, for the The LHCb Collaboration" @default.
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