Search for $η_c (2S)\toπ^{+}π^{-}η_{c}$ and $η_c (2S)\toπ^{+}π^{-}K^0_S K^{\pm}π^{\mp}$ decays
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| Format: | Preprint |
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2024
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| _version_ | 1866909068518490112 |
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| author | The BESIII Collaboration |
| author_facet | The BESIII Collaboration |
| contents | Based on $(27.12\pm 0.14)\times 10^{8}$ $ψ(2S)$ events collected with the BESIII detector, we search for the decay $η_c (2S) \rightarrow π^{+} π^{-} η_c$ with $η_c\rightarrow K_S^0 K^{\pm}π^{\mp}$ and $η_c\rightarrow K^{+}K^{-}π^{0}$. No significant signal is observed, and the upper limit on the product branching fraction $\mathcal{B}(ψ(2S)\rightarrow γη_{c}(2S))\times\mathcal{B}$($η_c (2S) \rightarrow π^{+} π^{-} η_c$) is determined to be $2.21\times10^{-5}$ at the 90\% confidence level. In addition, the analysis of the process $ψ(2S)\toγη_{c}(2S), η_{c}(2S)\rightarrow π^{+}π^{-}K^{0}_{S}K^{\pm}π^{\mp}$ gives a clear $η_c(2S)$ signal with a statistical significance of $10σ$ for the first time, %The product branching fraction $\mathcal{B}(ψ(2S)\rightarrow γη_{c}(2S))\times\mathcal{B}(η_{c}(2S)\rightarrow π^{+}π^{-}K^{0}_{S}Kπ) $ is measured to be $(9.31 \pm 0.72 \pm 2.77)\times 10^{-6}$, and and the branching fraction $\mathcal{B}(η_{c}(2S)\rightarrow π^{+}π^{-}K^{0}_{S}K^{\pm}π^{\mp})$ is determined to be ($1.33 \pm 0.11 \pm 0.4 \pm 0.95 $)$\times 10^{-2}$, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the quoted $\mathcal{B}(ψ(2S)\rightarrow γη_{c}(2S))$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_05457 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Search for $η_c (2S)\toπ^{+}π^{-}η_{c}$ and $η_c (2S)\toπ^{+}π^{-}K^0_S K^{\pm}π^{\mp}$ decays The BESIII Collaboration High Energy Physics - Experiment Based on $(27.12\pm 0.14)\times 10^{8}$ $ψ(2S)$ events collected with the BESIII detector, we search for the decay $η_c (2S) \rightarrow π^{+} π^{-} η_c$ with $η_c\rightarrow K_S^0 K^{\pm}π^{\mp}$ and $η_c\rightarrow K^{+}K^{-}π^{0}$. No significant signal is observed, and the upper limit on the product branching fraction $\mathcal{B}(ψ(2S)\rightarrow γη_{c}(2S))\times\mathcal{B}$($η_c (2S) \rightarrow π^{+} π^{-} η_c$) is determined to be $2.21\times10^{-5}$ at the 90\% confidence level. In addition, the analysis of the process $ψ(2S)\toγη_{c}(2S), η_{c}(2S)\rightarrow π^{+}π^{-}K^{0}_{S}K^{\pm}π^{\mp}$ gives a clear $η_c(2S)$ signal with a statistical significance of $10σ$ for the first time, %The product branching fraction $\mathcal{B}(ψ(2S)\rightarrow γη_{c}(2S))\times\mathcal{B}(η_{c}(2S)\rightarrow π^{+}π^{-}K^{0}_{S}Kπ) $ is measured to be $(9.31 \pm 0.72 \pm 2.77)\times 10^{-6}$, and and the branching fraction $\mathcal{B}(η_{c}(2S)\rightarrow π^{+}π^{-}K^{0}_{S}K^{\pm}π^{\mp})$ is determined to be ($1.33 \pm 0.11 \pm 0.4 \pm 0.95 $)$\times 10^{-2}$, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the quoted $\mathcal{B}(ψ(2S)\rightarrow γη_{c}(2S))$. |
| title | Search for $η_c (2S)\toπ^{+}π^{-}η_{c}$ and $η_c (2S)\toπ^{+}π^{-}K^0_S K^{\pm}π^{\mp}$ decays |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2401.05457 |