Abstract
We report on measurements of the mass and lifetime of the Ξ-b baryon using about 1800 Ξ-b decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb-1, collected by the LHCb experiment. The decays are reconstructed in the Ξ-b → Ξ0cπ-, Ξ0c → pK-K-π+, channel and the mass and lifetime are measured using the Λ0b → Λ+Cπ- mode as a reference. We measure M(Ξ-b) - M(Λ0b) = 178.36±0.46±0.16 MeV/c2, (τΞ-b/τΛ0b) = 1.089±0.026±0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the Ξ-b mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.
Original language | English |
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Article number | 242002 |
Number of pages | 9 |
Journal | Physical Review Letters |
Volume | 113 |
Issue number | 24 |
DOIs | |
Publication status | Published - 9 Dec 2014 |
ASJC Scopus subject areas
- General Physics and Astronomy