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2014-06

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cc-by (c) Camboni, Alessandro et al., 2014
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/185643

Precision measurement of the ratio of the Lambda(0)(b) to (B)over-bar(0) lifetimes

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https://doi.org/10.1016/j.physletb.2014.05.021

Abstract

The LHCb measurement of the lifetime ratio of the Λ 0 b baryon to the B0 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 0 b → J/ψ pK− and B0 → J/ψ π+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 B0 lifetime, the Λ 0 b lifetime is found to be 1.479 ± 0.009 ± 0.010 ps.

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Hadrons, Gran Col·lisionador d'Hadrons, Física de partícules, Experiments

Subject (English)

Hadrons, Large Hadron Collider (France and Switzerland), Particle physics, Experiments

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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CAMBONI, Alessandro, et al. Precision measurement of the ratio of the Lambda(0)(b) to (B)over-bar(0) lifetimes. Physics Letters B. 2014. Vol. 734, num. 122-130. ISSN 0370-2693. [consulted: 8 of June of 2026]. Available at: https://hdl.handle.net/2445/185643

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