Precision Measurement of the Λ[0 over b] Baryon Lifetime
The ratio of the Λ[0 over b] baryon lifetime to that of the B̅[superscript 0] meson is measured using 1.0 fb[superscript -1] of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λ[0 over b] baryon is observed for the first time in the decay mode Λ[0 over b]→J/ψpK[su...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/81351 https://orcid.org/0000-0001-8285-3346 |
| Summary: | The ratio of the Λ[0 over b] baryon lifetime to that of the B̅[superscript 0] meson is measured using 1.0 fb[superscript -1] of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λ[0 over b] baryon is observed for the first time in the decay mode Λ[0 over b]→J/ψpK[superscript -], while the B̅[superscript 0] meson decay used is the well known B̅[superscript 0]→J/ψπ[superscript +]K[superscript -] mode, where the π[superscript +]K[superscript -] mass is consistent with that of the K̅[superscript *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 B̅[superscript 0] meson lifetime, the Λ[0 over b] 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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