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Precision measurement of the Λ0b baryon lifetime


LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Precision measurement of the Λ0b baryon lifetime. Physical Review Letters, 111:102003.

Abstract

The ratio of the Λ0b baryon lifetime to that of the B¯¯¯0 meson is measured using 1.0  fb−1 of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λ0b baryon is observed for the first time in the decay mode Λ0b→J/ψpK−, while the B¯¯¯0 meson decay used is the well known B¯¯¯0→J/ψπ+K− mode, where the π+K− mass is consistent with that of the K¯¯¯*0(892) meson. The ratio of lifetimes is measured to be 0.976±0.012±0.006, in agreement with theoretical expectations based on the heavy quark expansion. Using previous determinations of the B¯¯¯0 meson lifetime, the Λ0b lifetime is found to be 1.482±0.018±0.012  ps. In both cases, the first uncertainty is statistical and the second systematic.

Abstract

The ratio of the Λ0b baryon lifetime to that of the B¯¯¯0 meson is measured using 1.0  fb−1 of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λ0b baryon is observed for the first time in the decay mode Λ0b→J/ψpK−, while the B¯¯¯0 meson decay used is the well known B¯¯¯0→J/ψπ+K− mode, where the π+K− mass is consistent with that of the K¯¯¯*0(892) meson. The ratio of lifetimes is measured to be 0.976±0.012±0.006, in agreement with theoretical expectations based on the heavy quark expansion. Using previous determinations of the B¯¯¯0 meson lifetime, the Λ0b lifetime is found to be 1.482±0.018±0.012  ps. In both cases, the first uncertainty is statistical and the second systematic.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:21 Feb 2014 07:58
Last Modified:05 Apr 2016 17:35
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.111.102003

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