Precision measurement of the Ξb- baryon lifetime

The LHCb Collaboration; W. Barter; F. Betti; A. Bohare; E. Buchanan; P. E. L. Clarke; R. Currie; S. Eisenhardt; K. Farmer; S. Gambetta; Y. Liu; F. Muheim; M. Needham; F. Oliva; R.H. O'Neil; O. Ozcelik; M. Richardson-Slipper; G. Sarpis; L. Soares Lavra; C. Vrahas; M. R. J. Williams

doi:10.1103/PhysRevD.110.072002

Precision measurement of the Ξb- baryon lifetime

The LHCb Collaboration, W. Barter, F. Betti, A. Bohare, E. Buchanan, P. E. L. Clarke, R. Currie, S. Eisenhardt, K. Farmer, S. Gambetta, Y. Liu, F. Muheim, M. Needham, F. Oliva, R.H. O'Neil, O. Ozcelik, M. Richardson-Slipper, G. Sarpis, L. Soares Lavra, C. VrahasM. R. J. Williams

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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 ¼ 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 rRun 1;2τ = 1.078 ± 0.012 ± 0.007. Multiplying by the world-average value of the Λ0b lifetime yields τRun 1;2Ξ−b¼ =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.

Original language	English
Article number	072002
Pages (from-to)	1-16
Number of pages	16
Journal	Physical Review D
Volume	110
Issue number	7
Early online date	1 Oct 2024
DOIs	https://doi.org/10.1103/PhysRevD.110.072002
Publication status	Published - 3 Oct 2024

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3 Active
4 Finished

Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 31/03/26
Project: Research
Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons
Barter, W. (Principal Investigator)
UKRI (formerly RCUK)
1/07/22 → 30/06/27
Project: Research

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The LHCb Collaboration, Barter, W., Betti, F., Bohare, A., Buchanan, E., Clarke, P. E. L., Currie, R., Eisenhardt, S., Farmer, K., Gambetta, S., Liu, Y., Muheim, F., Needham, M., Oliva, F., O'Neil, R. H., Ozcelik, O., Richardson-Slipper, M., Sarpis, G., Lavra, L. S., ... Williams, M. R. J. (2024). Precision measurement of the Ξb- baryon lifetime. Physical Review D, 110(7), 1-16. Article 072002. https://doi.org/10.1103/PhysRevD.110.072002

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title = "Precision measurement of the Ξb- baryon lifetime",

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 ¼ 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 rRun 1;2τ = 1.078 ± 0.012 ± 0.007. Multiplying by the world-average value of the Λ0b lifetime yields τRun 1;2Ξ−b¼ =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.",

author = "\{The LHCb Collaboration\} and W. Barter and F. Betti and A. Bohare and E. Buchanan and Clarke, \{P. E. L.\} and R. Currie and S. Eisenhardt and K. Farmer and S. Gambetta and Y. Liu and F. Muheim and M. Needham and F. Oliva and R.H. O'Neil and O. Ozcelik and M. Richardson-Slipper and G. Sarpis and Lavra, \{L. Soares\} and C. Vrahas and Williams, \{M. R. J.\}",

year = "2024",

month = oct,

day = "3",

doi = "10.1103/PhysRevD.110.072002",

language = "English",

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The LHCb Collaboration, Barter, W , Betti, F, Bohare, A, Buchanan, E , Clarke, PEL , Currie, R , Eisenhardt, S, Farmer, K, Gambetta, S, Liu, Y, Muheim, F , Needham, M , Oliva, F, O'Neil, RH, Ozcelik, O, Richardson-Slipper, M, Sarpis, G, Lavra, LS, Vrahas, C & Williams, MRJ 2024, 'Precision measurement of the Ξb- baryon lifetime', Physical Review D, vol. 110, no. 7, 072002, pp. 1-16. https://doi.org/10.1103/PhysRevD.110.072002

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T1 - Precision measurement of the Ξb- baryon lifetime

AU - The LHCb Collaboration

AU - Barter, W.

AU - Betti, F.

AU - Bohare, A.

AU - Buchanan, E.

AU - Clarke, P. E. L.

AU - Currie, R.

AU - Eisenhardt, S.

AU - Farmer, K.

AU - Gambetta, S.

AU - Liu, Y.

AU - Muheim, F.

AU - Needham, M.

AU - Oliva, F.

AU - O'Neil, R.H.

AU - Ozcelik, O.

AU - Richardson-Slipper, M.

AU - Sarpis, G.

AU - Lavra, L. Soares

AU - Vrahas, C.

AU - Williams, M. R. J.

PY - 2024/10/3

Y1 - 2024/10/3

N2 - 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 ¼ 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 rRun 1;2τ = 1.078 ± 0.012 ± 0.007. Multiplying by the world-average value of the Λ0b lifetime yields τRun 1;2Ξ−b¼ =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.

AB - 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 ¼ 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 rRun 1;2τ = 1.078 ± 0.012 ± 0.007. Multiplying by the world-average value of the Λ0b lifetime yields τRun 1;2Ξ−b¼ =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.

U2 - 10.1103/PhysRevD.110.072002

DO - 10.1103/PhysRevD.110.072002

M3 - Article

SN - 2470-0010

VL - 110

SP - 1

EP - 16

JO - Physical Review D

JF - Physical Review D

IS - 7

M1 - 072002

ER -

Precision measurement of the Ξb- baryon lifetime

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Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons

Cite this