Measurement of the time-integrated CP asymmetry in D0 → K−K+ decays

Medientyp: E-Artikel

Titel: Measurement of the time-integrated CP asymmetry in D0 → K−K+ decays

Beteiligte: Aaij, Roel [Verfasser:in]; Archilli, Flavio [Verfasser:in]; Bachmann, Sebastian [Verfasser:in]; Berninghoff, Daniel [Verfasser:in]; Borsato, Martino [Verfasser:in]; Caspary, Rowina [Verfasser:in]; Frau, Giulia [Verfasser:in]; Gerick, David [Verfasser:in]; Grabowski, Jascha [Verfasser:in]; Günther, Paul André [Verfasser:in]; Han, Xiaoxue [Verfasser:in]; Hansmann-Menzemer, Stephanie [Verfasser:in]; Hu, Jiangqiao [Verfasser:in]; Kopecná, Renata [Verfasser:in]; Leverington, Blake [Verfasser:in]; Li, Peilian [Verfasser:in]; Marks, Jörg [Verfasser:in]; Unverzagt, Daniel Joachim [Verfasser:in]; Uwer, Ulrich [Verfasser:in]; Witola, Lukas [Verfasser:in]; Zhelezov, Alexey [Verfasser:in]

Erschienen: 1 September 2023

Sprache: Englisch

DOI: 10.1103/PhysRevLett.131.091802

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Anmerkungen: Veröffentlicht: 29. August 2023
*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)
Im Titel ist die Zahl 0 sowie das Plus- und Minuszeichen hochgestellt

Beschreibung: 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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