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 Ξ-b baryon to that of the Λ0b baryon, rτ ≡ τΞ-b=τΛ0b. 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 rRun1,2τ = 1.078 ± 0.012 ± 0.007. Multiplying by the world-average value of the Λ0b lifetime yields τRun1,2Ξ-b = 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 Ξ-b lifetime by about a factor of 2, and is in good agreement with the most recent theoretical predictions.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2024). Precision measurement of the Ξ-bbaryon lifetime. PHYSICAL REVIEW D, 110(7) [10.1103/PhysRevD.110.072002].

Precision measurement of the Ξ-bbaryon lifetime

Anelli A.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Pizzichemi M.;Salomoni M.;
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 Ξ-b baryon to that of the Λ0b baryon, rτ ≡ τΞ-b=τΛ0b. 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 rRun1,2τ = 1.078 ± 0.012 ± 0.007. Multiplying by the world-average value of the Λ0b lifetime yields τRun1,2Ξ-b = 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 Ξ-b lifetime by about a factor of 2, and is in good agreement with the most recent theoretical predictions.
Articolo in rivista - Articolo scientifico
pp collision data
English
3-ott-2024
2024
110
7
072002
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2024). Precision measurement of the Ξ-bbaryon lifetime. PHYSICAL REVIEW D, 110(7) [10.1103/PhysRevD.110.072002].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/579121
Citazioni
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
Social impact