Abstract
The ratio of the baryon lifetime to that of the meson is measured using of integrated luminosity in 7 TeV center-of-mass energy collisions at the LHC. The baryon is observed for the first time in the decay mode , while the meson decay used is the well known mode, where the mass is consistent with that of the meson. The ratio of lifetimes is measured to be , in agreement with theoretical expectations based on the heavy quark expansion. Using previous determinations of the meson lifetime, the lifetime is found to be . In both cases, the first uncertainty is statistical and the second systematic.
- Received 9 July 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.102003
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© 2013 CERN, for the LHCb collaboration
Synopsis
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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