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Schwartz, A. J.; Kinoshita, K.; Aihara, H.; Al Said, S.; Asner, D. M.; Atmacan, H.; Aulchenko, V.; Ayad, R.; Babu, V.; Bahinipati, S.; Behera, P.; Bennett, J.; Bilka, T.; Bobrov, A.; Bonvicini, G.; Branchini, P.; Browder, T. E.; Campajola, M.; Chang, M. -C.; Chang, P.; Chilikin, K.; Cho, K.; Cho, S. -J.; Choi, S. -K.; Cinabro, D.; Cunliffe, S.; Das, S.; De Pietro, G.; Dhamija, R.; Doležal, Z.; Dong, T. V.; Eidelman, S.; Epifanov, D.; Ferber, T.; Fulsom, B. G.; Garg, R.; Gaur, V.; Giri, A.; Golob, B.; Gu, T.; Guan, Y.; Hou, W. -S.; Inami, K.; Ishikawa, A.; Iwasaki, M.; Jang, E. -J.; Jia, S.; Jin, Y.; Joo, K. K.; Kim, S. H.; Kim, Y. -K.; Kodyš, P.; Korpar, S.; Kuhr, T.; Kumar, M.; Kumara, K.; Lalwani, K.; Laurenza, M.; Lee, S. C.; Gioi, L. Li; Libby, J.; Liventsev, D.; Miyabayashi, K.; Mizuk, R.; Natkaniec, Z.; Nayak, L.; Niiyama, M.; Nishimura, K.; Ono, H.; Pakhlov, P.; Pakhlova, G.; Pardi, S.; Paul, S.; Pestotnik, R.; Podobnik, T.; Rout, N.; Russo, G.; Sahoo, D.; Sandilya, S.; Sangal, A.; Santelj, L.; Schnell, G.; Shen, C. P.; Shiu, J. -G.; Shwartz, B.; Sokolov, A.; Solovieva, E.; Takizawa, M.; Tenchini, F.; Unno, Y.; Uno, K.; Vahsen, S. E.; Varner, G.; Wang, P.; Wang, X. L.; Yabsley, B. D.; Yan, W. B.; Yusa, Y.; Zhang, Z. P.; Zhilich, V.
The journal of high energy physics, 09/2021, Letnik: 2021, Številka: 9Journal Article
We measure the branching fractions and CP asymmetries for the singly Cabibbo-suppressed decays $D^0 → π^+π^-η, D^0 → K^+K^-η$, and $D^0 → Φη$, using 980 fb-1 of data from the Belle experiment at the KEKB e+e- collider. We obtain $$\mathcal{B}(D^0 → π^+π^-η = \mathrm{1.22 ± 0.02 (stat) ± 0.02(syst) ± 0.03}(\mathcal{B}_{\mathrm{ref}}) \mathrm{x 10^{-3}}$$ $$\mathcal{B}(D^0 → K^+K^-η = \mathrm{1.80^{+0.07}_{-0.06}(stat) ± 0.04 (syst) ± 0.05}(\mathcal{B}_{\mathrm{ref}}) \mathrm{x 10^{-4}}$$ $$\mathcal{B}(D^0 → Φη = \mathrm{1.84 ± 0.09 (stat) ± 0.0 (syst) ± 0.05}(\mathcal{B}_{\mathrm{ref}}) \mathrm{x 10^{-4}}$$ where the third uncertainty ($\mathcal{B}_{\mathrm{ref}}$) is from the uncertainty in the branching fraction of the reference mode $D^0 → K^-π^+η$. The color-suppressed decay $D^0 → Φη$ is observed for the first time, with very high significance. The results for the CP asymmetries are $$A_{CP} (D^0 → π^+π^-η) = \mathrm{0.9 ± 1.2 (stat) ± 0.5 (syst)}\%$$ $$A_{CP} (D^0 → K^+K^-η) = \mathrm{-1.4 ± 3.3 (stat) ± 1.1 (syst)}\%$$ $$A_{CP} (D^0 → Φη) = \mathrm{-1.9 ± 4.4 (stat) ± 0.6 (syst)}\%$$ The results for $D^0 → π^+π^-η$ are a significant improvement over previous results. The branching fraction and ACP results for $D^0 → K^+K^-η$, and the ACP result for $D^0 → Φη$, are the first such measurements. No evidence for CP violation is found in any of these decays.
