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Observation of the decay Λb0 → pK−μ+μ− and a search for CP violation
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LHCb collaboration (Including: Back, J. J., Blake, Thomas, Costa Sobral, Cayo, Crocombe, Andrew, Gershon, T. J., Kreps, Michal, Latham, Thomas, Loh, David, Mathad, Abhijit , O'Hanlon, Daniel P., Poluektov, Anton, Qian, W., Wallace, Charlotte and Wicht, Jean). (2017) Observation of the decay Λb0 → pK−μ+μ− and a search for CP violation. Journal of High Energy Physics, 2017 (6). 108. doi:10.1007/jhep06(2017)108 ISSN 1029-8479.
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Official URL: https://doi.org/10.1007/jhep06(2017)108
Abstract
A search for CP violation in the decay Λb0 → pK−μ+μ− is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λb0 → pK−μ+μ− decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, ΔACP≡ACPΛb0→pK−μ+μ−−ACPΛb0→pK−J/ψ and aaCPT^‐odd, where the latter is based on asymmetries in the angle between the μ+μ− and pK− decay planes.These are measured to be ΔACP=−3.5±5.0stat±0.2syst×10−2,aCPT^‐odd=1.2±5.0stat±0.7syst×10−2,and no evidence for CP violation is found.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Journal or Publication Title: | Journal of High Energy Physics | ||||||
| Publisher: | Springer Berlin Heidelberg | ||||||
| ISSN: | 1029-8479 | ||||||
| Official Date: | 21 June 2017 | ||||||
| Dates: |
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| Volume: | 2017 | ||||||
| Number: | 6 | ||||||
| Article Number: | 108 | ||||||
| DOI: | 10.1007/jhep06(2017)108 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Reuse Statement (publisher, data, author rights): | |||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 17 September 2018 | ||||||
| Date of first compliant Open Access: | 17 September 2018 |
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