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Precision measurement of the ratio of the Λb0 to B¯0 lifetimes


LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2014). Precision measurement of the ratio of the Λb0 to B¯0 lifetimes. Physics Letters B, 734:122-130.

Abstract

The LHCb measurement of the lifetime ratio of the Λ0b to the B⎯⎯⎯0 meson is updated using data corresponding to an integrated luminosity of 3.0 fb−1 collected using 7 and 8 TeV centre-of-mass energy pp collisions at the LHC. The decay modes used are Λ⎯⎯⎯0b→J/ψpK− and B⎯⎯⎯0→J/ψπ+K−, where the π+K− mass is consistent with that of the K⎯⎯⎯∗0(892) meson. The lifetime ratio is determined with unprecedented precision to be 0.974±0.006±0.004, where the first uncertainty is statistical and the second systematic. This result is in agreement with original theoretical predictions based on the heavy quark expansion. Using the current world average of the B⎯⎯⎯0 lifetime, the Λ0b lifetime is found to be 1.479±0.009±0.010 ps.

Abstract

The LHCb measurement of the lifetime ratio of the Λ0b to the B⎯⎯⎯0 meson is updated using data corresponding to an integrated luminosity of 3.0 fb−1 collected using 7 and 8 TeV centre-of-mass energy pp collisions at the LHC. The decay modes used are Λ⎯⎯⎯0b→J/ψpK− and B⎯⎯⎯0→J/ψπ+K−, where the π+K− mass is consistent with that of the K⎯⎯⎯∗0(892) meson. The lifetime ratio is determined with unprecedented precision to be 0.974±0.006±0.004, where the first uncertainty is statistical and the second systematic. This result is in agreement with original theoretical predictions based on the heavy quark expansion. Using the current world average of the B⎯⎯⎯0 lifetime, the Λ0b lifetime is found to be 1.479±0.009±0.010 ps.

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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:2014
Deposited On:20 Feb 2015 22:41
Last Modified:05 Apr 2016 19:03
Publisher:Elsevier
ISSN:0370-2693
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.physletb.2014.05.021

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