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 |
| _version_ | 1826212626468700160 |
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| author | Williams, Michael |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Williams, Michael |
| author_sort | Williams, Michael |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T15:29:26Z |
| format | Article |
| id | mit-1721.1/81351 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:29:26Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/813512022-09-29T14:46:20Z Precision Measurement of the Λ[0 over b] Baryon Lifetime Williams, Michael Massachusetts Institute of Technology. Department of Physics Williams, Michael 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. National Science Foundation (U.S.) 2013-10-09T13:34:48Z 2013-10-09T13:34:48Z 2013-09 2013-07 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/81351 Aaij, R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. “Precision Measurement of the Λ_{b}^{0} Baryon Lifetime.” Physical Review Letters 111, no. 10 (September 2013). © 2013 CERN https://orcid.org/0000-0001-8285-3346 en_US http://dx.doi.org/10.1103/PhysRevLett.111.102003 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society American Physical Society |
| spellingShingle | Williams, Michael Precision Measurement of the Λ[0 over b] Baryon Lifetime |
| title | Precision Measurement of the Λ[0 over b] Baryon Lifetime |
| title_full | Precision Measurement of the Λ[0 over b] Baryon Lifetime |
| title_fullStr | Precision Measurement of the Λ[0 over b] Baryon Lifetime |
| title_full_unstemmed | Precision Measurement of the Λ[0 over b] Baryon Lifetime |
| title_short | Precision Measurement of the Λ[0 over b] Baryon Lifetime |
| title_sort | precision measurement of the λ 0 over b baryon lifetime |
| url | http://hdl.handle.net/1721.1/81351 https://orcid.org/0000-0001-8285-3346 |
| work_keys_str_mv | AT williamsmichael precisionmeasurementofthel0overbbaryonlifetime |