%0 Electronic Article %A Li, L. K. %A Schwartz, A. J. %A Kinoshita, K. %A Adachi, I. %A Aihara, H. %A Al Said, S. %A Asner, D. M. %A Atmacan, H. %A Aulchenko, V. %A Aushev, T. %A Ayad, R. %A Babu, V. %A Bahinipati, S. %A Behera, P. %A Bennett, J. %A Bessner, M. %A Bilka, T. %A Biswal, J. %A Bobrov, A. %A Bonvicini, G. %A Bozek, A. %A Bračko, M. %A Branchini, P. %A Browder, T. E. %A Budano, A. %A Campajola, M. %A Červenkov, D. %A Chang, M.-C. %A Chang, P. %A Chekelian, V. %A Chen, A. %A Chen, Y. Q. %A Cheon, B. G. %A Chilikin, K. %A Cho, H. E. %A Cho, K. %A Cho, S.-J. %A Choi, S.-K. %A Choi, Y. %A Choudhury, S. %A Cinabro, D. %A Cunliffe, S. %A Das, S. %A Dash, N. %A De Nardo, G. %A De Pietro, G. %A Dhamija, R. %A Di Capua, F. %A Doležal, Z. %A Dong, T. V. %A Eidelman, S. %A Epifanov, D. %A Ferber, T. %A Fulsom, B. G. %A Garg, R. %A Gaur, V. %A Giri, A. %A Goldenzweig, P. %A Golob, B. %A Graziani, E. %A Gu, T. %A Guan, Y. %A Hadjivasiliou, C. %A Halder, S. %A Hayasaka, K. %A Hou, W.-S. %A Inami, K. %A Ishikawa, A. %A Iwasaki, M. %A Iwasaki, Y. %A Jacobs, W. W. %A Jang, E.-J. %A Jia, S. %A Jin, Y. %A Joo, K. K. %A Kang, K. H. %A Karyan, G. %A Kiesling, C. %A Kim, C. H. %A Kim, D. Y. %A Kim, K.-H. %A Kim, S. H. %A Kim, Y.-K. %A Kodyš, P. %A Konno, T. %A Korobov, A. %A Korpar, S. %A Kovalenko, E. %A Križan, P. %A Kroeger, R. %A Krokovny, P. %A Kuhr, T. %A Kumar, M. %A Kumara, K. %A Kuzmin, A. %A Kwon, Y.-J. %A Lalwani, K. %A Laurenza, M. %A Lee, S. C. %A Li, C. H. %A Li Gioi, L. %A Libby, J. %A Lieret, K. %A Liventsev, D. %A Masuda, M. %A Matvienko, D. %A Merola, M. %A Metzner, F. %A Miyabayashi, K. %A Mizuk, R. %A Mohanty, G. B. %A Mori, T. %A Nakao, M. %A Natkaniec, Z. %A Natochii, A. %A Nayak, L. %A Nayak, M. %A Niiyama, M. %A Nisar, N. K. %A Nishida, S. %A Nishimura, K. %A Ono, H. %A Oskin, P. %A Pakhlov, P. %A Pakhlova, G. %A Pardi, S. %A Park, S.-H. %A Passeri, A. %A Paul, S. %A Pedlar, T. K. %A Pestotnik, R. %A Piilonen, L. E. %A Podobnik, T. %A Popov, V. %A Prencipe, E. %A Prim, M. T. %A Rout, N. %A Russo, G. %A Sahoo, D. %A Sakai, Y. %A Sandilya, S. %A Sangal, A. %A Santelj, L. %A Sanuki, T. %A Savinov, V. %A Schnell, G. %A Schwanda, C. %A Seino, Y. %A Senyo, K. %A Shapkin, M. %A Sharma, C. %A Shen, C. P. %A Shiu, J.-G. %A Shwartz, B. %A Sokolov, A. %A Solovieva, E. %A Starič, M. %A Stottler, Z. S. %A Sumihama, M. %A Sumiyoshi, T. %A Takizawa, M. %A Tanida, K. %A Tenchini, F. %A Uchida, M. %A Uglov, T. %A Unno, Y. %A Uno, K. %A Uno, S. %A Vahsen, S. E. %A Van Tonder, R. %A Varner, G. %A Vinokurova, A. %A Waheed, E. %A Wang, C. H. %A Wang, M.-Z. %A Wang, P. %A Wang, X. L. %A Watanuki, S. %A Won, E. %A Yabsley, B. D. %A Yan, W. B. %A Yang, S. B. %A Ye, H. %A Yelton, J. %A Yin, J. H. %A Yusa, Y. %A Zhang, Z. P. %A Zhilich, V. %A Zhukova, V. %T Measurement of branching fractions and search for CP violation in D<sup>0</sup>→π<sup>+</sup>π<sup>−</sup>η, D<sup>0</sup>→ K<sup>+</sup>K<sup>−</sup>η, and D<sup>0</sup>→ϕη at Belle %N KEK Preprint 2021-8 %M PUBDB-2021-04651 %M KEK Preprint 2021-8 %M Belle Preprint 2021-11 %M UCHEP-21-03 %M arXiv:2106.04286 %M KEK Preprint 2021-8 %M Belle Preprint 2021-11 %M UCHEP-21-03 %Z 21 pages, 7 figures, 13.09.2021 %X We measure the branching fractions and CP asymmetries for the singly Cabibbo-suppressed decays D<sup>0</sup> → π<sup>+</sup>π<sup>−</sup>η, D<sup>0</sup> → K<sup>+</sup>K<sup>−</sup>η, and D<sup>0</sup> → ϕη, using 980 fb<sup>−1</sup> of data from the Belle experiment at the KEKB e<sup>+</sup>e<sup>−</sup> collider. We obtain %X <table class="tabular"> %X <tr><td align="center"><table border="0" cellspacing="0" cellpadding="0"><tr><td nowrap="nowrap" align="center"> %X <i>B</i>(D<sup>0</sup>→ π<sup>+</sup>π<sup>−</sup>η)=[1.22±0.02(stat)±0.02(syst)±0.03(<i>B</i><sub>ref</sub>)]×10<sup>−3</sup>,</td></tr></table></td></tr> %X <tr><td align="center"><table border="0" cellspacing="0" cellpadding="0"><tr><td nowrap="nowrap" align="center"> %X <i>B</i>(D<sup>0</sup>→ K<sup>+</sup>K<sup>−</sup>η)=[1.80<sub>−0.06</sub><sup>+0.07</sup>(stat)±0.04(syst)±0.05(<i>B</i><sub>ref</sub>)]×10<sup>−4</sup>,</td></tr></table></td></tr> %X <tr><td align="center"><table border="0" cellspacing="0" cellpadding="0"><tr><td nowrap="nowrap" align="center"> %X <i>B</i>(D<sup>0</sup>→ ϕη)=[1.84±0.09(stat)±0.06(syst)±0.05(<i>B</i><sub>ref</sub>)]×10<sup>−4</sup>,</td></tr></table></td></tr></table> %X where the third uncertainty ( <i>B</i> <sub>ref</sub>) is from the uncertainty in the branching fraction of the reference mode D<sup>0</sup> → K<sup>−</sup>π<sup>+</sup>η. The color-suppressed decay D<sup>0</sup> → ϕη is observed for the first time, with very high significance. The results for the CP asymmetries are %X <table class="tabular"> %X <tr><td align="center"><table border="0" cellspacing="0" cellpadding="0"><tr><td nowrap="nowrap" align="center"> %X A<sub>CP</sub>(D<sup>0</sup> π<sup>+</sup>π<sup>−</sup>η)=[0.9±1.2(stat)±0.5(syst)]%,</td></tr></table></td></tr> %X <tr><td align="center"><table border="0" cellspacing="0" cellpadding="0"><tr><td nowrap="nowrap" align="center"> %X A<sub>CP</sub>(D<sup>0</sup>→ K<sup>+</sup>K<sup>−</sup>η)=[−1.4±3.3(stat)±1.1(syst)]%,</td></tr></table></td></tr> %X <tr><td align="center"><table border="0" cellspacing="0" cellpadding="0"><tr><td nowrap="nowrap" align="center"> %X ACP (D<sup>0</sup>→ ϕη)=[−1.9±4.4(stat)±0.6(syst)]%.</td></tr></table></td></tr></table> %X The results for D<sup>0</sup> → π<sup>+</sup>π<sup>−</sup>η are a significant improvement over previous results. The branching fraction and A<sub>CP</sub> results for D<sup>0</sup> → K<sup>+</sup>K<sup>−</sup>η, and the ACP result for D<sup>0</sup> → ϕη, are the first such measurements. No evidence for CP violation is found in any of these decays.[graphic not available: see fulltext] %K electron positron: annihilation (INSPIRE) %K electron positron: colliding beams (INSPIRE) %K D0: hadronic decay (INSPIRE) %K eta (INSPIRE) %K Phi(1020) (INSPIRE) %K pi+ (INSPIRE) %K pi- (INSPIRE) %K asymmetry: CP (INSPIRE) %K CP: violation (INSPIRE) %K D0: branching ratio: measured (INSPIRE) %K BELLE (INSPIRE) %K KEK-B (INSPIRE) %K experimental results (INSPIRE) %K D0 --> pi+ pi- eta (INSPIRE) %K D0 --> K+ K- eta (INSPIRE) %K D0 --> Phi(1020) eta (INSPIRE) %K Branching fraction (autogen) %K Charm physics (autogen) %K CP violation (autogen) %K e+-e− Experiments (autogen) %F PUB:(DE-HGF)25 %9 Preprint %U https://bib-pubdb1.desy.de/record/471807