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 Λ0b baryon, r_τ ≡ τ_Ξb−/τ_Λ0b. The value r_τ = 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 r_τ^Run1,2 = 1.078 ± 0.012 ± 0.007. Multiplying by the world-average value of the Λ0b lifetime yields τ_Ξb−^Run 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 Λ0b lifetime. This measurement improves the precision of the current world average of the Ξb− lifetime by about a factor of two, and is in good agreement with the most recent theoretical predictions.

Aaij, R., Abdelmotteleb, A. . ., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. ., et al. (2024). Precision measurement of the Ξb− baryon lifetime. PHYSICAL REVIEW D, 110(7), 1-16 [10.1103/physrevd.110.072002].

Precision measurement of the Ξb− baryon lifetime

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2024

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 Λ0b baryon, r_τ ≡ τ_Ξb−/τ_Λ0b. The value r_τ = 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 r_τ^Run1,2 = 1.078 ± 0.012 ± 0.007. Multiplying by the world-average value of the Λ0b lifetime yields τ_Ξb−^Run 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 Λ0b lifetime. This measurement improves the precision of the current world average of the Ξb− lifetime by about a factor of two, and is in good agreement with the most recent theoretical predictions.
2024
Aaij, R., Abdelmotteleb, A. . ., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. ., et al. (2024). Precision measurement of the Ξb− baryon lifetime. PHYSICAL REVIEW D, 110(7), 1-16 [10.1103/physrevd.110.072002].
Aaij, R.; Abdelmotteleb, A.  S.  W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1002533
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