A measurement of time-dependent CP violation in the decays of B⁰ and B̅⁰ mesons to the final states J/ψ(→ μ⁺μ⁻)K⁰_S, ψ(2S)(→ μ⁺μ⁻)K⁰_S and J/ψ(→ e⁺e⁻)K⁰_S with K⁰_S → π⁺π⁻ is presented. The data correspond to an integrated luminosity of 6 fb⁻¹ collected at a center-of-mass energy of √s = 13 TeV with the LHCb detector. The CP-violation parameters are measured to be SψK⁰S = 0.717 ± 0.013(stat)± 0.008(syst) and CψK⁰S = 0.008 ± 0.012(stat) ± 0.003(syst). This measurement of SψK⁰S represents the most precise single measurement of the CKM angle β to date and is more precise than the current world average. In addition, measurements of the CP-violation parameters of the individual channels are reported and acombination with the LHCb Run 1 measurements is performed.
Measurement of CP Violation in B0 → ψ(→ l+l−) K0 S(→ π + π −)Decays
Cardinale, R.;Petrolini, A.;Sergi, A.;Spadaro Norella, E.;
2024-01-01
Abstract
A measurement of time-dependent CP violation in the decays of B⁰ and B̅⁰ mesons to the final states J/ψ(→ μ⁺μ⁻)K⁰_S, ψ(2S)(→ μ⁺μ⁻)K⁰_S and J/ψ(→ e⁺e⁻)K⁰_S with K⁰_S → π⁺π⁻ is presented. The data correspond to an integrated luminosity of 6 fb⁻¹ collected at a center-of-mass energy of √s = 13 TeV with the LHCb detector. The CP-violation parameters are measured to be SψK⁰S = 0.717 ± 0.013(stat)± 0.008(syst) and CψK⁰S = 0.008 ± 0.012(stat) ± 0.003(syst). This measurement of SψK⁰S represents the most precise single measurement of the CKM angle β to date and is more precise than the current world average. In addition, measurements of the CP-violation parameters of the individual channels are reported and acombination with the LHCb Run 1 measurements is performed.| File | Dimensione | Formato | |
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