학술논문
Measurement of branching fractions and search for CP violation in D 0 → π + π − η, D 0 → K + K − η, and D 0 → ϕη at Belle
Document Type
article
Author
The Belle collaboration; L. K. Li; A. J. Schwartz; K. Kinoshita; I. Adachi; H. Aihara; S. Al Said; D. M. Asner; H. Atmacan; V. Aulchenko; T. Aushev; R. Ayad; V. Babu; S. Bahinipati; P. Behera; J. Bennett; M. Bessner; T. Bilka; J. Biswal; A. Bobrov; G. Bonvicini; A. Bozek; M. Bračko; P. Branchini; T. E. Browder; A. Budano; M. Campajola; D. Červenkov; M.-C. Chang; P. Chang; V. Chekelian; A. Chen; Y. Q. Chen; B. G. Cheon; K. Chilikin; H. E. Cho; K. Cho; S.-J. Cho; S.-K. Choi; Y. Choi; S. Choudhury; D. Cinabro; S. Cunliffe; S. Das; N. Dash; G. De Nardo; G. De Pietro; R. Dhamija; F. Di Capua; Z. Doležal; T. V. Dong; S. Eidelman; D. Epifanov; T. Ferber; B. G. Fulsom; R. Garg; V. Gaur; A. Giri; P. Goldenzweig; B. Golob; E. Graziani; T. Gu; Y. Guan; C. Hadjivasiliou; S. Halder; K. Hayasaka; W.-S. Hou; K. Inami; A. Ishikawa; M. Iwasaki; Y. Iwasaki; W. W. Jacobs; E.-J. Jang; S. Jia; Y. Jin; K. K. Joo; K. H. Kang; G. Karyan; C. Kiesling; C. H. Kim; D. Y. Kim; K.-H. Kim; S. H. Kim; Y.-K. Kim; P. Kodyš; T. Konno; A. Korobov; S. Korpar; E. Kovalenko; P. Križan; R. Kroeger; P. Krokovny; T. Kuhr; M. Kumar; K. Kumara; A. Kuzmin; Y.-J. Kwon; K. Lalwani; M. Laurenza; S. C. Lee; C. H. Li; L. Li Gioi; J. Libby; K. Lieret; D. Liventsev; M. Masuda; D. Matvienko; M. Merola; F. Metzner; K. Miyabayashi; R. Mizuk; G. B. Mohanty; T. Mori; M. Nakao; Z. Natkaniec; A. Natochii; L. Nayak; M. Nayak; M. Niiyama; N. K. Nisar; S. Nishida; K. Nishimura; H. Ono; P. Oskin; P. Pakhlov; G. Pakhlova; S. Pardi; S.-H. Park; A. Passeri; S. Paul; T. K. Pedlar; R. Pestotnik; L. E. Piilonen; T. Podobnik; V. Popov; E. Prencipe; M. T. Prim; N. Rout; G. Russo; D. Sahoo; Y. Sakai; S. Sandilya; A. Sangal; L. Santelj; T. Sanuki; V. Savinov; G. Schnell; C. Schwanda; Y. Seino; K. Senyo; M. Shapkin; C. Sharma; C. P. Shen; J.-G. Shiu; B. Shwartz; A. Sokolov; E. Solovieva; M. Starič; Z. S. Stottler; M. Sumihama; T. Sumiyoshi; M. Takizawa; K. Tanida; F. Tenchini; M. Uchida; T. Uglov; Y. Unno; K. Uno; S. Uno; S. E. Vahsen; R. Van Tonder; G. Varner; A. Vinokurova; E. Waheed; C. H. Wang; M.-Z. Wang; P. Wang; X. L. Wang; S. Watanuki; E. Won; B. D. Yabsley; W. B. Yan; S. B. Yang; H. Ye; J. Yelton; J. H. Yin; Y. Yusa; Z. P. Zhang; V. Zhilich; V. Zhukova
Source
Journal of High Energy Physics, Vol 2021, Iss 9, Pp 1-25 (2021)
Subject
Language
English
ISSN
1029-8479
Abstract
Abstract 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 B D 0 → π + π − η = 1.22 ± 0.02 stat ± 0.02 syst ± 0.03 B ref × 10 − 3 , B D 0 → K + K − η = 1.80 − 0.06 + 0.07 stat ± 0.04 syst ± 0.05 B ref × 10 − 4 , B D 0 → ϕη = 1.84 ± 0.09 stat ± 0.06 syst ± 0.05 B ref × 10 − 4 , $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({D}^0\to {\pi}^{+}{\pi}^{-}\eta \right)=\left[1.22\pm 0.02\left(\mathrm{stat}\right)\pm 0.02\left(\mathrm{syst}\right)\pm 0.03\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-3},\\ {}\mathcal{B}\left({D}^0\to {K}^{+}{K}^{-}\eta \right)=\left[{1.80}_{-0.06}^{+0.07}\left(\mathrm{stat}\right)\pm 0.04\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\\ {}\mathcal{B}\left({D}^0\to \phi \eta \right)=\left[1.84\pm 0.09\left(\mathrm{stat}\right)\pm 0.06\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\end{array}} $$ where the third uncertainty ( B $$ \mathcal{B} $$ 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 = 0.9 ± 1.2 stat ± 0.5 syst % , A CP D 0 → K + K − η = − 1.4 ± 3.3 stat ± 1.1 syst % , ACP D 0 → ϕη = − 1.9 ± 4.4 stat ± 0.6 syst % . $$ {\displaystyle \begin{array}{c}{A}_{CP}\left({D}^0\ {\pi}^{+}{\pi}^{-}\eta \right)=\left[0.9\pm 1.2\left(\mathrm{stat}\right)\pm 0.5\left(\mathrm{syst}\right)\right]\%,\\ {}{A}_{CP}\left({D}^0\to {K}^{+}{K}^{-}\eta \right)=\left[-1.4\pm 3.3\left(\mathrm{stat}\right)\pm 1.1\left(\mathrm{syst}\right)\right]\%,\\ {} ACP\ \left({D}^0\to \phi \eta \right)=\left[-1.9\pm 4.4\left(\mathrm{stat}\right)\pm 0.6\left(\mathrm{syst}\right)\right]\%.\end{array}} $$ The results for D 0 → π + π − η are a significant improvement over previous results. The branching fraction and A CP 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.