Measurements of the absolute branching fractions of $D^0\toγ\bar K^{*0}$ and $D^0\toγϕ$
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866917520419586048 |
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| author | BESIII Collaboration |
| author_facet | BESIII Collaboration |
| contents | By analyzing a sample of 20.3 fb$^{-1}$ of $e^+e^-$ annihilation data collected at the center-of-mass energy of 3.773~GeV with the BESIII detector, we have made a first measurement of the absolute branching fractions of the radiative decays $D^0\toγ\bar K^{*0}$ and $D^0\toγϕ$ to be $(3.81 \pm 0.18_{\rm stat.} \pm 0.20_{\rm syst.})\times 10^{-4}$ and $(2.51 \pm 0.44_{\rm stat.} \pm 0.11_{\rm syst.})\times 10^{-5}$, respectively.
The statistical significances of $D^0\toγ\bar K^{*0}$ and $D^0\toγϕ$ are $26.8σ$ and $7.9σ$, respectively. The obtained branching fractions are consistent with the corresponding world average values. In addition, the measured $C\!P$ asymmetry $\mathcal{A}_{C\!P}(D^0\toγ\bar K^{*0})=(-0.7\pm5.0_{\rm stat.} \pm4.1_{\rm syst.})\%$ is consistent with $C\!P$ conservation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_22670 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Measurements of the absolute branching fractions of $D^0\toγ\bar K^{*0}$ and $D^0\toγϕ$ BESIII Collaboration High Energy Physics - Experiment By analyzing a sample of 20.3 fb$^{-1}$ of $e^+e^-$ annihilation data collected at the center-of-mass energy of 3.773~GeV with the BESIII detector, we have made a first measurement of the absolute branching fractions of the radiative decays $D^0\toγ\bar K^{*0}$ and $D^0\toγϕ$ to be $(3.81 \pm 0.18_{\rm stat.} \pm 0.20_{\rm syst.})\times 10^{-4}$ and $(2.51 \pm 0.44_{\rm stat.} \pm 0.11_{\rm syst.})\times 10^{-5}$, respectively. The statistical significances of $D^0\toγ\bar K^{*0}$ and $D^0\toγϕ$ are $26.8σ$ and $7.9σ$, respectively. The obtained branching fractions are consistent with the corresponding world average values. In addition, the measured $C\!P$ asymmetry $\mathcal{A}_{C\!P}(D^0\toγ\bar K^{*0})=(-0.7\pm5.0_{\rm stat.} \pm4.1_{\rm syst.})\%$ is consistent with $C\!P$ conservation. |
| title | Measurements of the absolute branching fractions of $D^0\toγ\bar K^{*0}$ and $D^0\toγϕ$ |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2605.22670 |