Improved measurement of CP violation parameters in B0S → J/psi K+ K- decays in the vicinity of the phi (1020) resonance
The decay-time-dependent 𝐶𝑃 asymmetry in 𝐵0𝑠→𝐽/𝜓(→𝜇+𝜇−)𝐾+𝐾− decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 𝐵0𝑠 signal decay...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
2 February 2024
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| 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) |
MARC
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| 245 | 1 | 0 | |a Improved measurement of CP violation parameters in B0S → J/psi K+ K- decays in the vicinity of the phi (1020) resonance |c R. Aaij et al.* (LHCb Collaboration) |
| 246 | 3 | 3 | |a Improved measurement of CP violation parameters in B0S → J/psi K plus K minus decays in the vicinity of the phi (1020) resonance |
| 246 | 3 | 3 | |a Improved measurement of CP violation parameters in B 0 S → J / psi K + K - decays in the vicinity of the phi (1020) resonance |
| 264 | 1 | |c 2 February 2024 | |
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| 500 | |a 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. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecná, 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 | ||
| 500 | |a Die Zeichen 0, + und - sind im Titel hochgestellt, S ist tiefgestellt | ||
| 500 | |a Gesehen am 13.11.2024 | ||
| 520 | |a The decay-time-dependent asymmetry in 0→/(→+−)+− decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 0 signal decays with an invariant +− mass in the vicinity of the (1020) resonance, the -violating phase is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the 0−¯0 system, ΔΓ, and the difference of the average 0 and 0 meson decay widths, Γ−Γ. The values obtained are =−0.039±0.022±0.006 rad, ΔΓ=0.0845±0.0044±0.0024 ps−1, and Γ−Γ=−0.0056+0.0013−0.0015±0.0014 ps−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 is also measured independently for each polarization state of the +− system and shows no evidence for polarization dependence. | ||
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