## Abstract

By analyzing e^{+}e^{−} annihilation data corresponding to an integrated luminosity of 2.93 fb^{−1} collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we report the first observations of the doubly Cabibbo-suppressed decays D^{+}→ K^{+}π^{0}π^{0} and D^{+}→ K^{+}π^{0}η. The branching fractions of D^{+}→ K^{+}π^{0}π^{0} and D^{+}→ K^{+}π^{0}η are measured to be (2.1 ± 0.4_{stat} ± 0.1_{syst}) × 10^{−4} and (2.1 ± 0.5_{stat} ± 0.1_{syst}) × 10^{−4} with statistical significances of 8.8σ and 5.5σ, respectively. In addition, we search for the subprocesses D^{+}→ K^{*}(892)^{+}π^{0} and D^{+}→ K^{*}(892)^{+}η with K^{*}(892)^{+}→ K^{+}π^{0}. The branching fraction of D^{+}→ K^{*}(892)^{+}η is determined to be (4.4−1.5stat+1.8± 0.2_{syst}) × 10^{−4}, with a statistical significance of 3.2σ. No significant signal for D^{+}→ K^{*}(892)^{+}π^{0} is found and we set an upper limit on the branching fraction of this decay at the 90% confidence level to be 5.4 × 10^{−4}. [Figure not available: see fulltext.]

Original language | English (US) |
---|---|

Article number | 107 |

Journal | Journal of High Energy Physics |

Volume | 2022 |

Issue number | 9 |

DOIs | |

State | Published - Sep 2022 |

### Bibliographical note

Publisher Copyright:© 2022, The Author(s).

## Keywords

- Branching fraction
- Charm Physics
- Flavour Physics
- e-e Experiments

## Fingerprint

Dive into the research topics of 'Observation of the doubly Cabibbo-suppressed decays D^{+}→ K

^{+}π

^{0}π

^{0}and D

^{+}→ K

^{+}π

^{0}η'. Together they form a unique fingerprint.