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 Xib- baryon to that of the Lambda0b baryon, r_tau = tau_Xib-/tau_Lambda0b. The value r_tau = 1.076 \pm 0.013 \pm 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_Run1,2tau = 1.078 \pm 0.012 \pm 0.007. Multiplying by the world-average value of the Lambda0b lifetime yields τRun1,2Xib- = 1.578 \pm 0.018 \pm 0.010 \pm 0.011 ps, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Lambda0b lifetime. This measurement improves the precision of the current world average of the Xib- lifetime by about a factor of 2, and is in good agreement with the most recent theoretical predictions.
Precision measurement of the Xib- baryon lifetime
Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Riccardi D.Membro del Collaboration Group
;
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 Xib- baryon to that of the Lambda0b baryon, r_tau = tau_Xib-/tau_Lambda0b. The value r_tau = 1.076 \pm 0.013 \pm 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_Run1,2tau = 1.078 \pm 0.012 \pm 0.007. Multiplying by the world-average value of the Lambda0b lifetime yields τRun1,2Xib- = 1.578 \pm 0.018 \pm 0.010 \pm 0.011 ps, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Lambda0b lifetime. This measurement improves the precision of the current world average of the Xib- lifetime by about a factor of 2, and is in good agreement with the most recent theoretical predictions.File | Dimensione | Formato | |
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PhysRevD.110.072002.pdf
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