A measurement of the CP asymmetry difference between Lambda(+)(C) -> pK(-)K(+) and p pi(-)pi(+) decays
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Published version
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Author(s)
Type
Journal Article
Abstract
The difference between the CP asymmetries in the decays Λ c + → pK−K+ and Λ c + → pπ−π+ is presented. Proton-proton collision data taken at centre-of-mass energies of 7 and 8 TeV collected by the LHCb detector in 2011 and 2012 are used, corresponding to an integrated luminosity of 3 fb−1. The Λ c + candidates are reconstructed as part of the Λ b 0 → Λ c + μ−X decay chain. In order to maximize the cancellation of production and detection asymmetries in the difference, the final-state kinematic distributions of the two samples are aligned by applying phase-space-dependent weights to the Λ c + → pπ−π+ sample. This alters the definition of the integrated CP asymmetry to A CP wgt (pπ−π+). Both samples are corrected for reconstruction and selection efficiencies across the five-dimensional Λ c + decay phase space. The difference in CP asymmetries is found to be
ΔAwgtCP=ACP(pK−K+)−AwgtCP(pπ−π+)=(0.30±0.91±0.61) %,
where the first uncertainty is statistical and the second is systematic.
ΔAwgtCP=ACP(pK−K+)−AwgtCP(pπ−π+)=(0.30±0.91±0.61) %,
where the first uncertainty is statistical and the second is systematic.
Date Issued
2018-03-29
Date Acceptance
2017-03-07
Citation
JOURNAL OF HIGH ENERGY PHYSICS, 2018, 2018 (3)
ISSN
1029-8479
Publisher
SPRINGER
Journal / Book Title
JOURNAL OF HIGH ENERGY PHYSICS
Volume
2018
Issue
3
Copyright Statement
© 2018 The Author(s). Open Access.
This article is distributed under the terms of the Creative Commons
Attribution License (
CC-BY 4.0 https://creativecommons.org/licenses/by/4.0/), which permits any use, distribution and reproduction in
any medium, provided the original author(s) and source are credited.
This article is distributed under the terms of the Creative Commons
Attribution License (
CC-BY 4.0 https://creativecommons.org/licenses/by/4.0/), which permits any use, distribution and reproduction in
any medium, provided the original author(s) and source are credited.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000430567200002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Particles & Fields
Physics
Charm physics
CP violation
Flavor physics
Hadron-Hadron scattering (experiments)
TOOL
Publication Status
Published
Article Number
ARTN 182
Date Publish Online
2018-03-29