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$Measurement of branching fractions and search for CP violation inD⁰ → π⁺π⁻η, D⁰ → K⁺K⁻η , andD⁰ → Φηat Belle$

Measurement of branching fractions and search for CP violation inD⁰ → π⁺π⁻η, D⁰ → K⁺K⁻η , andD⁰ → Φηat Belle

by Jin, Y. , Ye, H. , Nakao, M. , Sanuki, T. , Starič, M. , Gaur, V. , Chang, P. , Kiesling, C. , Hayasaka, K. , Shapkin, M. , Yang, S. B. , Hou, W. -S. , Kinoshita, K. , Cunliffe, S. , Kodyš, P. , Kim, S. H. , Stottler, Z. S. , Chekelian, V. , Doležal, Z. , Sumiyoshi, T. , Kroeger, R. , Cinabro, D. , Nisar, N. K. , Chilikin, K. , Di Capua, F. , Sokolov, A. , Kim, C. H. , Das, S. , Uchida, M. , Unno, Y. , Li, C. H. , Mori, T. , Natkaniec, Z. , Ferber, T. , Branchini, P. , De Pietro, G. , Sangal, A. , Dhamija, R. , Miyabayashi, K. , Prim, M. T. , Zhang, Z. P. , Bozek, A. , Garg, R. , Pakhlov, P. , Epifanov, D. , Gioi, L. Li , Paul, S. , Oskin, P. , Inami, K. , Halder, S. , Schwanda, C. , Jang, E. -J. , Karyan, G. , Kumar, M. , Kang, K. H. , Ono, H. , Popov, V. , Shwartz, B. , Choi, S. -K. , Mohanty, G. B. , Atmacan, H. , Sahoo, D. , Fulsom, B. G. , Kumara, K. , Aushev, T. , Nishida, S. , Waheed, E. , Bonvicini, G. , Graziani, E. , De Nardo, G. , Jacobs, W. W. , Schnell, G. , Podobnik, T. , Bilka, T. , Savinov, V. , Chang, M. -C. , Krokovny, P. , Eidelman, S. , Gu, T. , Kovalenko, E. , Križan, P. , Asner, D. M. , Iwasaki, Y. , Pestotnik, R. , Konno, T. , Dong, T. V. , Lieret, K. , Nishimura, K. , Yan, W. B. , Červenkov, D. , Lee, S. C. , Niiyama, M. , Li, L. K.

in branching fraction / charm physics / CP violation / e+-e- experiments

2021

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Measurement of branching fractions and search for CP violation inD⁰ → π⁺π⁻η, D⁰ → K⁺K⁻η , andD⁰ → Φηat Belle

in branching fraction / charm physics / CP violation / e+-e- experiments

2021

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$Measurement of branching fractions and search for CP violation inD⁰ → π⁺π⁻η, D⁰ → K⁺K⁻η , andD⁰ → Φηat Belle$

Measurement of branching fractions and search for CP violation inD⁰ → π⁺π⁻η, D⁰ → K⁺K⁻η , andD⁰ → Φηat Belle

in branching fraction / charm physics / CP violation / e+-e- experiments

2021

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$Measurement of branching fractions and search for CP violation inD⁰ → π⁺π⁻η, D⁰ → K⁺K⁻η , andD⁰ → Φηat Belle$

Journal Article

Measurement of branching fractions and search for CP violation inD⁰ → π⁺π⁻η, D⁰ → K⁺K⁻η , andD⁰ → Φηat Belle

Jin, Y.,

Ye, H.,

Nakao, M.,

Sanuki, T.,

Starič, M.,

Gaur, V.,

Chang, P.,

Kiesling, C.,

Hayasaka, K.,

Shapkin, M.,

Yang, S. B.,

Hou, W. -S.,

Kinoshita, K.,

Cunliffe, S.,

Kodyš, P.,

Kim, S. H.,

Stottler, Z. S.,

Chekelian, V.,

Doležal, Z.,

Sumiyoshi, T.,

Kroeger, R.,

Cinabro, D.,

Nisar, N. K.,

Chilikin, K.,

Di Capua, F.,

Sokolov, A.,

Kim, C. H.,

Das, S.,

Uchida, M.,

Unno, Y.,

Li, C. H.,

Mori, T.,

Natkaniec, Z.,

Ferber, T.,

Branchini, P.,

De Pietro, G.,

Sangal, A.,

Dhamija, R.,

Miyabayashi, K.,

Prim, M. T.,

Zhang, Z. P.,

Bozek, A.,

Garg, R.,

Pakhlov, P.,

Epifanov, D.,

Gioi, L. Li,

Paul, S.,

Oskin, P.,

Inami, K.,

Halder, S.,

Schwanda, C.,

Jang, E. -J.,

Karyan, G.,

Kumar, M.,

Kang, K. H.,

Ono, H.,

Popov, V.,

Shwartz, B.,

Choi, S. -K.,

Mohanty, G. B.,

Atmacan, H.,

Sahoo, D.,

Fulsom, B. G.,

Kumara, K.,

Aushev, T.,

Nishida, S.,

Waheed, E.,

Bonvicini, G.,

Graziani, E.,

De Nardo, G.,

Jacobs, W. W.,

Schnell, G.,

Podobnik, T.,

Bilka, T.,

Savinov, V.,

Chang, M. -C.,

Krokovny, P.,

Eidelman, S.,

Gu, T.,

Kovalenko, E.,

Križan, P.,

Asner, D. M.,

Iwasaki, Y.,

Pestotnik, R.,

Konno, T.,

Dong, T. V.,

Lieret, K.,

Nishimura, K.,

Yan, W. B.,

Červenkov, D.,

Lee, S. C.,

Niiyama, M.,

Li, L. K.

2021

Overview

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.

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