The new $K_S \rightarrow πe ν$ branching fraction measurement at KLOE
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866909157352800256 |
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| author | Passeri, A. |
| author_facet | Passeri, A. |
| contents | A new measurement of the branching fraction for the decay $K_S \rightarrow πe ν$ is presented, based on a sample of 300 million $K_S$ mesons recorded by the KLOE experiment at the DA$Φ$NE $e^+e^-$ collider. A two-step signal selection strategy is used, exploiting first kinematic variables and then time-of-flight measurements. Data control samples of $K_S \rightarrow πe ν$ decays are used to evaluate signal selection efficiencies. Normalizing the selected sample to the number of $K_S \rightarrow π^+ π^-$ decay events the result for the branching fraction is $B(K_S \rightarrow πe ν)=(7.211 \pm 0.046 \pm 0.052)\times 10^-4$. The combination with our previous measurement gives $B(K_S \rightarrow πe ν)=(7.153 \pm 0.037 \pm 0.043)\times 10^-4 =(7.153 \pm 0.057)\times 10^-4$. From this value we derive $f^+(0)|Vus|=0.2170 \pm 0.0009$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_01826 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The new $K_S \rightarrow πe ν$ branching fraction measurement at KLOE Passeri, A. High Energy Physics - Experiment A new measurement of the branching fraction for the decay $K_S \rightarrow πe ν$ is presented, based on a sample of 300 million $K_S$ mesons recorded by the KLOE experiment at the DA$Φ$NE $e^+e^-$ collider. A two-step signal selection strategy is used, exploiting first kinematic variables and then time-of-flight measurements. Data control samples of $K_S \rightarrow πe ν$ decays are used to evaluate signal selection efficiencies. Normalizing the selected sample to the number of $K_S \rightarrow π^+ π^-$ decay events the result for the branching fraction is $B(K_S \rightarrow πe ν)=(7.211 \pm 0.046 \pm 0.052)\times 10^-4$. The combination with our previous measurement gives $B(K_S \rightarrow πe ν)=(7.153 \pm 0.037 \pm 0.043)\times 10^-4 =(7.153 \pm 0.057)\times 10^-4$. From this value we derive $f^+(0)|Vus|=0.2170 \pm 0.0009$. |
| title | The new $K_S \rightarrow πe ν$ branching fraction measurement at KLOE |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2404.01826 |