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| Home > Publications database > Measurement of branching fractions and search for $CP$ violation in $D^{0}\to\pi^{+}\pi^{-}\eta$, $D^{0}\to K^{+}K^{-}\eta$, and $D^{0}\to\phi\eta$ at Belle |
| Preprint | PUBDB-2021-04651 |
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Report No.: Belle Preprint 2021-11; KEK Preprint 2021-8; UCHEP-21-03; arXiv:2106.04286
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$ {\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}} $where the third uncertainty ($ \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$ {\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.[graphic not available: see fulltext]
Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; D0: hadronic decay ; eta ; Phi(1020) ; pi+ ; pi- ; asymmetry: CP ; CP: violation ; D0: branching ratio: measured ; BELLE ; KEK-B ; experimental results ; D0 --> pi+ pi- eta ; D0 --> K+ K- eta ; D0 --> Phi(1020) eta ; Branching fraction ; Charm physics ; CP violation ; e+-e− Experiments
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Journal Article
Measurement of branching fractions and search for $CP$ violation in $D^{0}\to\pi^{+}\pi^{-}\eta$, $D^{0}\to K^{+}K^{-}\eta$, and $D^{0}\to\phi\eta$ at Belle
Journal of high energy physics 09(9), 075 (2021) [10.1007/JHEP09(2021)075]
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