The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A., et al. (2025). First Evidence for Direct CP Violation in Beauty to Charmonium Decays. PHYSICAL REVIEW LETTERS, 134(10) [10.1103/physrevlett.134.101801].

First Evidence for Direct CP Violation in Beauty to Charmonium Decays

Anelli, A.;Borsato, M.;Calvi, M.;Capelli, S.;Carniti, P.;Fazzini, D.;Gotti, C.;Kirsebom, V.  S.;Malentacca, L.;Martinazzoli, L.;Martinelli, M.;Minotti, A.;Pizzichemi, M.;Salomoni, M.;
2025

Abstract

The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.
Articolo in rivista - Articolo scientifico
LHCb; Physics; CP violation; CPV
English
12-mar-2025
2025
134
10
101801
open
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A., et al. (2025). First Evidence for Direct CP Violation in Beauty to Charmonium Decays. PHYSICAL REVIEW LETTERS, 134(10) [10.1103/physrevlett.134.101801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/559521
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