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Journal Article

Precision measurement of the Ξb baryon lifetime

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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2024). Precision measurement of the Ξb baryon lifetime. Physical Review D, 110(7): 072002. doi:10.1103/PhysRevD.110.072002.


Cite as: https://hdl.handle.net/21.11116/0000-000F-EA18-F
Abstract
A sample of pp collision data, corresponding to an integrated luminosity of 5.5 fb−1 and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the Ξb baryon to that of the Λb0 baryon, rτ ≡ τΞb = τΛb0. The value rτ = 1.076 ± 0.013 ± 0.006 is obtained, where the first uncertainty is statistical and the second systematic. This value is averaged with the corresponding value from Run 1 to obtain rτRun 1;2 = 1.078 ± 0.012 ± 0.007. Multiplying by the world-average value of the Λb0 lifetime yields τΞbRun 1;2 = 1.578 ± 0.018 ± 0.010 ± 0.011 ps, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λb0 lifetime. This measurement improves the precision of the current world average of the Ξb lifetime by about a factor of 2, and is in good agreement with the most recent theoretical predictions.