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Improved measurement of CP violation parameters in B0S โ†’ J/psi K+ K- decays in the vicinity of the phi (1020) resonance

The decay-time-dependent ๐ถโข๐‘ƒ asymmetry in ๐ต0๐‘ โ†’๐ฝ/๐œ“โก(โ†’๐œ‡+โข๐œ‡โˆ’)โข๐พ+โข๐พโˆ’ decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6 fbโˆ’1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 ๐ต0๐‘  signal decay...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Borsato, Martino (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Cocha Toapaxi, Carlos (Author) , De Cian, Michel (Author) , Frau, Giulia (Author) , Glaser, Fabian (Author) , Guฬˆnther, Paulโ€‰Andreฬ (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kopecnaฬ, Renata (Author) , Kubat, Jakub (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Joฬˆrg (Author) , Morgenthaler, Maurice Pierre (Author) , Pais, Preema (Author) , Promberger, Laura (Author) , Skuza, Raphael (Author) , Tuci, Giulia (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 2 February 2024
In: Physical review letters
Year: 2024, Volume: 132, Issue: 5, Pages: 051802-1-051802-12
ISSN:1079-7114
DOI:10.1103/PhysRevLett.132.051802
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.132.051802
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.132.051802
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Author Notes:R. Aaij et al.* (LHCb Collaboration)
Description
Summary:The decay-time-dependent ๐ถโข๐‘ƒ asymmetry in ๐ต0๐‘ โ†’๐ฝ/๐œ“โก(โ†’๐œ‡+โข๐œ‡โˆ’)โข๐พ+โข๐พโˆ’ decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6 fbโˆ’1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 ๐ต0๐‘  signal decays with an invariant ๐พ+โข๐พโˆ’ mass in the vicinity of the ๐œ™โก(1020) resonance, the ๐ถโข๐‘ƒ-violating phase ๐œ™๐‘  is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the ๐ต0๐‘ โˆ’ยฏ๐ต0๐‘  system, ฮ”โขฮ“๐‘ , and the difference of the average ๐ต0๐‘  and ๐ต0 meson decay widths, ฮ“๐‘ โˆ’ฮ“๐‘‘. The values obtained are ๐œ™๐‘ =โˆ’0.039ยฑ0.022ยฑ0.006 rad, ฮ”โขฮ“๐‘ =0.0845ยฑ0.0044ยฑ0.0024 psโˆ’1, and ฮ“๐‘ โˆ’ฮ“๐‘‘=โˆ’0.005โข6+0.0013โˆ’0.0015ยฑ0.0014 psโˆ’1, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements to date and are consistent with expectations based on the Standard Model and with the previous LHCb analyses of this decay. These results are combined with previous independent LHCb measurements. The phase ๐œ™๐‘  is also measured independently for each polarization state of the ๐พ+โข๐พโˆ’ system and shows no evidence for polarization dependence.
Item Description:LHCb Collaboration: R. Aaij, S. Bachmann, D. Berninghoff, M. Borsato, L. Carus, R. Caspary, C. Cocha Toapaxi, M. De Cian, G. Frau, F.C. Glaser, P.A. Guฬˆnther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecnaฬ, J. Kubat, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, P.R. Pais, L. Promberger, R. Skuza, G. Tuci, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, Y. Zhao, A. Zhelezov und 1072 weitere
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Gesehen am 13.11.2024
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.132.051802

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