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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

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Official URL: https://doi.org/10.1007/jhep06(2017)108

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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 > 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:
DateEvent
21 June 2017Published
25 May 2017Accepted
Date of first compliant deposit: 17 September 2018
Volume: 2017
Number: 6
Article Number: 108
DOI: 10.1007/jhep06(2017)108
Status: Peer Reviewed
Publication Status: Published
Publisher Statement:
Access rights to Published version: Open Access

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