A sample of pp collision data, corresponding to an integrated luminosity of 5.4 fb−1 and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the Ξ0b baryon to that of the Λ0b baryon, (Formula presented). The value rRunτ2 ¼ 1.004 ± 0.009 ± 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 rτ ¼ 1.004 ± 0.008 ± 0.005. Multiplying by the known value of the Λ0b lifetime yields τΞ0 ¼ 1.475 ± 0.012 ± 0.008 ± 0.009 ps, where the last uncertainty is due to the limited knowledge b of the Λ0b lifetime. This measurement improves the precision of the current world average of the Ξ0b lifetime by about a factor of two, and is in good agreement with the most recent theoretical predictions. [The LHCb Collaboration]

Precision measurement of the Ξb0 baryon lifetime / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 112:5(2025 Sep 29), pp. 052012.1-052012.16. [10.1103/sllb-p3j8]

Precision measurement of the Ξb0 baryon lifetime

S. Cesare;C. Mancuso;D. Marangotto;N. Neri;G. Tonani;T. Tork;Z. Wang;
2025

Abstract

A sample of pp collision data, corresponding to an integrated luminosity of 5.4 fb−1 and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the Ξ0b baryon to that of the Λ0b baryon, (Formula presented). The value rRunτ2 ¼ 1.004 ± 0.009 ± 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 rτ ¼ 1.004 ± 0.008 ± 0.005. Multiplying by the known value of the Λ0b lifetime yields τΞ0 ¼ 1.475 ± 0.012 ± 0.008 ± 0.009 ps, where the last uncertainty is due to the limited knowledge b of the Λ0b lifetime. This measurement improves the precision of the current world average of the Ξ0b lifetime by about a factor of two, and is in good agreement with the most recent theoretical predictions. [The LHCb Collaboration]
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
29-set-2025
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1252100
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