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
Belle Collaboration; 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.;
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$_{ref}$)] x 10$^{-3}$
B(D$^{0}$ → K$^{+}$ K$^{-}$ η) = [1.22$_{-0.06}$$^{+0.07}$(stat) ± 0.04 (syst) ± 0.05(B$_{ref}$)] x 10$^{-4}$
B(D$^{0}$ → ϕη) = [1.84 ± 0.09 (stat) ± 0.06 (syst) ± 0.05(B$_{ref}$)] x 10$^{-4}$
where the third uncertainty (B$_{ref}$) is from the uncertainty in the branching fraction of the reference mode D$^{0}$ → K$^{-}$π$^{+}$η . The color-suppressed decay D$^{0}$ → ϕη is observed for the first time, with very high significance. The results for the CP asymmetries are
A$_{CP}$(D$^{0}$ → π$^{+}$ π$^{-}$ η) = [0.9 ± 1.2 (stat) ± 0.5 (syst)]%,
A$_{CP}$(D$^{0}$ → K$^{+}$ K$^{-}$ η) = [-1.4 ± 3.3 (stat) ± 0.6 (syst)]%,
A$_{CP}$(D$^{0}$ → ϕη) = [-1.9 ± 4.4 (stat) ± 0.6 (syst)]%,
The results for D$^{0}$ → π$^{+}$ π$^{-}$ η are a significant improvement over previous results. ... mehr
B(D$^{0}$ → π$^{+}$ π$^{-}$ η) = [1.22 ± 0.02 (stat) ± 0.02 (syst) ± 0.03(B$_{ref}$)] x 10$^{-3}$
B(D$^{0}$ → K$^{+}$ K$^{-}$ η) = [1.22$_{-0.06}$$^{+0.07}$(stat) ± 0.04 (syst) ± 0.05(B$_{ref}$)] x 10$^{-4}$
B(D$^{0}$ → ϕη) = [1.84 ± 0.09 (stat) ± 0.06 (syst) ± 0.05(B$_{ref}$)] x 10$^{-4}$
where the third uncertainty (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) ± 0.6 (syst)]%,
A$_{CP}$(D$^{0}$ → ϕη) = [-1.9 ± 4.4 (stat) ± 0.6 (syst)]%,
The results for D$^{0}$ → π$^{+}$ π$^{-}$ η are a significant improvement over previous results. ... mehr
| Zugehörige Institution(en) am KIT | Institut für Experimentelle Teilchenphysik (ETP) |
| Publikationstyp | Zeitschriftenaufsatz |
| Publikationsjahr | 2021 |
| Sprache | Englisch |
| Identifikator | ISSN: 1029-8479, 1126-6708, 1127-2236 KITopen-ID: 1000138680 |
| Erschienen in | Journal of High Energy Physics |
| Verlag | Scuola Internazionale Superiore di Studi Avanzati (SISSA) |
| Band | 2021 |
| Heft | 9 |
| Seiten | Art. Nr.: 75 |
| Bemerkung zur Veröffentlichung | Gefördert durch SCOAP3 |
| Vorab online veröffentlicht am | 13.09.2021 |
| Nachgewiesen in | arXiv Scopus Dimensions Web of Science |