Measurement of the mass and lifetime of the Ω−b baryon

Abstract : A proton-proton collision data sample, corresponding to an integrated luminosity of 3 fb−1 collected by LHCb at s√=7 and 8 TeV, is used to reconstruct 63±9 Ω−b→Ω0cπ−, Ω0c→pK−K−π+ decays. Using the Ξ−b→Ξ0cπ−, Ξ0c→pK−K−π+ decay mode for calibration, the lifetime ratio and absolute lifetime of the Ω−b baryon are measured to be τΩ−bτΞ−bτΩ−b=1.11±0.16±0.03,=1.78±0.26±0.04±0.05 ps, where the uncertainties are statistical, systematic and from the calibration mode (for τΩ−b only). A measurement is also made of the mass difference, mΩ−b−mΞ−b, and the corresponding Ω−b mass, which yields mΩ−b−mΞ−bmΩ−b=247.4±3.2±0.5 MeV/c2,=6045.1±3.2±0.5±0.6 MeV/c2. These results are consistent with previous measurements.
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Physical Review D, American Physical Society, 2016, 93, pp.092007. 〈10.1103/PhysRevD.93.092007〉
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Contributeur : Claudine Bombar <>
Soumis le : mardi 12 avril 2016 - 11:14:51
Dernière modification le : jeudi 18 janvier 2018 - 01:50:33

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Measurement of the mass and lifetime of the Ω−b baryon. Physical Review D, American Physical Society, 2016, 93, pp.092007. 〈10.1103/PhysRevD.93.092007〉. 〈in2p3-01301429〉

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