Measurement of the time-integrated CP asymmetry in D0 → K−K+ decays
The time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K−K+ is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7 fb−1 collected at a center-of-mass energy of 13 TeV with the LHCb detector. The D0 mesons are required to originate from promptly...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
1 September 2023
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| In: |
Physical review letters
Year: 2023, Volume: 131, Issue: 9, Pages: 1-13 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.131.091802 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.131.091802 Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.091802 
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| Author Notes: | R. Aaij et al. (LHCb Collaboration*) |
MARC
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| 245 | 1 | 0 | |a Measurement of the time-integrated CP asymmetry in D0 → K−K+ decays |c R. Aaij et al. (LHCb Collaboration*) |
| 246 | 3 | 3 | |a Measurement of the time-integrated CP asymmetry in D 0 → K − K + decays |
| 264 | 1 | |c 1 September 2023 | |
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| 500 | |a Veröffentlicht: 29. August 2023 | ||
| 500 | |a *LHCb Collaboration: R. Aaij, F. Archilli, S. Bachmann, D. Berninghoff, M. Borsato, R. Caspary, G. Frau, D. Gerick, J.P. Grabowski, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecna, B. Leverington, P. Li, J. Marks, D.J. Unverzagt, U. Uwer, C. Witola, A. Zhelezov (und 1051 weitere Personen) | ||
| 500 | |a Im Titel ist die Zahl 0 sowie das Plus- und Minuszeichen hochgestellt | ||
| 500 | |a Gesehen am 22.05.2024 | ||
| 520 | |a The time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K−K+ is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7 fb−1 collected at a center-of-mass energy of 13 TeV with the LHCb detector. The D0 mesons are required to originate from promptly produced D*+→D0π+ decays, and the charge of the companion pion is used to determine the flavor of the charm meson at production. The time-integrated CP asymmetry is measured to be ACP(K−K+)=[6.8±5.4±1.6]×10−4 where the first uncertainty is statistical and the second systematic. The direct CP asymmetries in D0→K−K+ and D0→π−π+ decays, adK−K+ and adπ−π+, are derived by combining ACP(K−K+) with the time-integrated CP asymmetry difference, ΔACP=ACP(K−K+)−ACP(π−π+), and other inputs, giving adK−K+=(7.7±5.7)×10−4,adπ−π+=(23.2±6.1)×10−4,with a correlation coefficient corresponding to ρ=0.88. The compatibility of these results with CP symmetry is 1.4 and 3.8 standard deviations for D0→K−K+ and D0→π−π+ decays, respectively. This is the first evidence for direct CP violation in a specific D0 decay. | ||
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