Measurement of the Λ0b, Ξ−b and Ω−b baryon masses

The LHCb Collaboration, Matthew Needham, Franz Muheim, Peter Clarke, Yuehong Xie, Stephan Eisenhardt

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 Λ0b→J/ψΛ, Ξ−b→J/ψΞ− and Ω−b→J/ψΩ− signals are observed and the corresponding masses are measured to be
while the diffierences with respect to the Λ0b mass are
These are the most precise mass measurements of the Λ0b, Ξ−b and Ω−b baryons to date. Averaging the above Λ0b mass measurement with that published by LHCb using 35 pb−1 of data collected in 2010 yields M(Λ0b)=5619.44±0.13(stat)±0.38(syst) MeV/c2.
Original languageEnglish
Pages (from-to)182001
Number of pages1
JournalPhysical Review Letters
Early online date5 Feb 2013
Publication statusPublished - 2 May 2013


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