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

Date Issued
01-09-2021
Author(s)
Li, L. K.
Schwartz, A. J.
Kinoshita, K.
Adachi, I.
Aihara, H.
Al Said, S.
Asner, D. M.
Atmacan, H.
Aulchenko, V.
Aushev, T.
Ayad, R.
Babu, V.
Bahinipati, S.
Behera, P.
Bennett, J.
Bessner, M.
Bilka, T.
Biswal, J.
Bobrov, A.
Bonvicini, G.
Bozek, A.
BraÄ ko, M.
Branchini, P.
Browder, T. E.
Budano, A.
Campajola, M.
ÄŒervenkov, D.
Chang, M. C.
Chang, P.
Chekelian, V.
Chen, A.
Chen, Y. Q.
Cheon, B. G.
Chilikin, K.
Cho, H. E.
Cho, K.
Cho, S. J.
Choi, S. K.
Choi, Y.
Choudhury, S.
Cinabro, D.
Cunliffe, S.
Das, S.
Dash, N.
De Nardo, G.
De Pietro, G.
Dhamija, R.
Di Capua, F.
Doležal, Z.
Dong, T. V.
Eidelman, S.
Epifanov, D.
Ferber, T.
Fulsom, B. G.
Garg, R.
Gaur, V.
Giri, A.
Goldenzweig, P.
Golob, B.
Graziani, E.
Gu, T.
Guan, Y.
Hadjivasiliou, C.
Halder, S.
Hayasaka, K.
Hou, W. S.
Inami, K.
Ishikawa, A.
Iwasaki, M.
Iwasaki, Y.
Jacobs, W. W.
Jang, E. J.
Jia, S.
Jin, Y.
Joo, K. K.
Kang, K. H.
Karyan, G.
Kiesling, C.
Kim, C. H.
Kim, D. Y.
Kim, K. H.
Kim, S. H.
Kim, Y. K.
Kodyš, P.
Konno, T.
Korobov, A.
Korpar, S.
Kovalenko, E.
Križan, P.
Kroeger, R.
Krokovny, P.
Kuhr, T.
Kumar, M.
Kumara, K.
Kuzmin, A.
Kwon, Y. J.
Lalwani, K.
Laurenza, M.
Lee, S. C.
Li, C. H.
DOI
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 obtainB(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 areACP(D0π+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. [Figure not available: see fulltext.]
Volume
2021
Subjects