We measure the branching fractions and CP asymmetries for the singly Cabibbo-suppressed decays D0→π+π−η, D0→K+K−η, and D0→ϕη, using 980 fb−1 of data from the Belle experiment at the KEKB e+e− collider. We obtain B(D0→π+π−η)=[1.22±0.02(stat)±0.02(syst)±0.03(Bref)]×10^−3, B(D0→K+K−η)=[1.80(−0.06/+0.07)(stat)±0.04(syst)±0.05(Bref)]×10^−4, B(D0→ϕη)=[1.84±0.09(stat)±0.06(syst)±0.05(Bref)]×10^−4, where the third uncertainty (Bref) is from the uncertainty in the branching fraction of the reference mode D0→K−π+η. The color-suppressed decay D0→ϕη is observed for the first time, with very high significance. The results for the CP asymmetries are ACP(D0 π+π−η)=[0.9±1.2(stat)±0.5(syst)]%, ACP(D0→K+K−η)=[−1.4±3.3(stat)±1.1(syst)]%, ACP (D0→ϕη)=[−1.9±4.4(stat)±0.6(syst)]%. The results for D0→π+π−η are a significant improvement over previous results. The branching fraction and ACP results for D0→K+K−η, and the ACP result for D0→ϕη, are the first such measurements. No evidence for CP violation is found in any of these decays.
Measurement of branching fractions and search for CP violation in D⁰ → π⁺π⁻η, D⁰ → K⁺K⁻η, and D⁰ → ϕη at Belle
Tenchini, F.;
2021-01-01
Abstract
We measure the branching fractions and CP asymmetries for the singly Cabibbo-suppressed decays D0→π+π−η, D0→K+K−η, and D0→ϕη, using 980 fb−1 of data from the Belle experiment at the KEKB e+e− collider. We obtain B(D0→π+π−η)=[1.22±0.02(stat)±0.02(syst)±0.03(Bref)]×10^−3, B(D0→K+K−η)=[1.80(−0.06/+0.07)(stat)±0.04(syst)±0.05(Bref)]×10^−4, B(D0→ϕη)=[1.84±0.09(stat)±0.06(syst)±0.05(Bref)]×10^−4, where the third uncertainty (Bref) is from the uncertainty in the branching fraction of the reference mode D0→K−π+η. The color-suppressed decay D0→ϕη is observed for the first time, with very high significance. The results for the CP asymmetries are ACP(D0 π+π−η)=[0.9±1.2(stat)±0.5(syst)]%, ACP(D0→K+K−η)=[−1.4±3.3(stat)±1.1(syst)]%, ACP (D0→ϕη)=[−1.9±4.4(stat)±0.6(syst)]%. The results for D0→π+π−η are a significant improvement over previous results. The branching fraction and ACP results for D0→K+K−η, and the ACP result for D0→ϕη, are the first such measurements. No evidence for CP violation is found in any of these decays.File | Dimensione | Formato | |
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