Precision Measurement of <i>CP</i> Violation in <i>B</i><sub>S</sub><SUP>0</SUP> → <i>J</i>/Ψ<i>K</i><SUP>+</SUP><i>K</i><SUP>-</SUP> Decays
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
The time-dependent 𝐶𝑃 asymmetry in 𝐵0
𝑠→𝐽/𝜓𝐾+𝐾− decays is measured using 𝑝𝑝 collision data, corresponding to an integrated luminosity of 3.0 fb−1, collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV. In a sample of 96 000 𝐵0
𝑠 →𝐽/𝜓𝐾+𝐾− decays, the 𝐶𝑃-violating phase 𝜙𝑠 is measured, as well as the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the 𝐵0
𝑠–
¯
𝐵
0
𝑠 system. The values obtained are 𝜙𝑠=−0.058±0.049±0.006 rad, Γ𝑠≡(ΓL+ΓH)/2=0.6603±0.0027±0.0015 ps−1, and ΔΓ𝑠≡ΓL−ΓH=0.0805±0.0091±0.0032 ps−1, where the first uncertainty is statistical and the second, systematic. These are the most precise single measurements of those quantities to date. A combined analysis with 𝐵0
𝑠 →𝐽/𝜓𝜋+𝜋− decays gives 𝜙𝑠=−0.010±0.039 rad. All measurements are in agreement with the standard model predictions. For the first time, the phase 𝜙𝑠 is measured independently for each polarization state of the 𝐾+𝐾− system and shows no evidence for polarization dependence.
𝑠→𝐽/𝜓𝐾+𝐾− decays is measured using 𝑝𝑝 collision data, corresponding to an integrated luminosity of 3.0 fb−1, collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV. In a sample of 96 000 𝐵0
𝑠 →𝐽/𝜓𝐾+𝐾− decays, the 𝐶𝑃-violating phase 𝜙𝑠 is measured, as well as the decay widths ΓL and ΓH of the light and heavy mass eigenstates of the 𝐵0
𝑠–
¯
𝐵
0
𝑠 system. The values obtained are 𝜙𝑠=−0.058±0.049±0.006 rad, Γ𝑠≡(ΓL+ΓH)/2=0.6603±0.0027±0.0015 ps−1, and ΔΓ𝑠≡ΓL−ΓH=0.0805±0.0091±0.0032 ps−1, where the first uncertainty is statistical and the second, systematic. These are the most precise single measurements of those quantities to date. A combined analysis with 𝐵0
𝑠 →𝐽/𝜓𝜋+𝜋− decays gives 𝜙𝑠=−0.010±0.039 rad. All measurements are in agreement with the standard model predictions. For the first time, the phase 𝜙𝑠 is measured independently for each polarization state of the 𝐾+𝐾− system and shows no evidence for polarization dependence.
Date Issued
2015-01-30
Date Acceptance
2015-01-01
Citation
Physical Review Letters, 2015, 114 (4)
ISSN
0031-9007
Publisher
American Physical Society
Journal / Book Title
Physical Review Letters
Volume
114
Issue
4
Copyright Statement
© 2015 CERN, for the LHCb Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published articles title, journal citation, and DOI.
License URL
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http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000351270800002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Physical Sciences
Physics
Physics, Multidisciplinary
Science & Technology
Publication Status
Published
Article Number
041801
Date Publish Online
2015-01-30