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Precision Measurement of the Λb0 Baryon Lifetime

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 111, 102003 – Published 5 September 2013
Physics logo See Synopsis: Heavy Quark Model Lands on Solid Footing

Abstract

The ratio of the Λb0 baryon lifetime to that of the B¯0 meson is measured using 1.0fb1 of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λb0 baryon is observed for the first time in the decay mode Λb0J/ψpK, while the B¯0 meson decay used is the well known B¯0J/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 Λb0 lifetime is found to be 1.482±0.018±0.012ps. In both cases, the first uncertainty is statistical and the second systematic.

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  • Received 9 July 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.102003

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2013 CERN, for the LHCb collaboration

Synopsis

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Heavy Quark Model Lands on Solid Footing

Published 5 September 2013

A new measurement of bottom-quark hadron lifetimes resolves a theoretical mystery.

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Vol. 111, Iss. 10 — 6 September 2013

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