New measurement of $K^+\toπ^+ν\barν$ branching ratio at the NA62 experiment
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914538935287808 |
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| author | Chang, Xiafei Collaboration, for the NA62 |
| author_facet | Chang, Xiafei Collaboration, for the NA62 |
| contents | The ultra-rare decay $K^+\toπ^+ν\barν$ is a golden mode in flavor physics. The Standard Model prediction for its branching ratio is below $10^{-10}$. This decay mode is highly sensitive to new physics models at mass scales up to $\mathcal{O}(100\,\mathrm{TeV})$. The NA62 experiment at CERN SPS is designed to measure this decay mode. A preliminary result of the branching ratio measurement using data collected in 2023--2024 is presented. With the new dataset, the NA62 experiment doubled its signal sample while reducing the background in proportion. Combining the data collected in 2016--2024, the branching ratio is measured to be $\mathcal{B}(K^+\toπ^+ν\barν) = \left(9.6^{+1.9}_{-1.8}\right)\times10^{-11}$. The result is compatible with the Standard Model prediction with a precision better than $20\%$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_12649 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | New measurement of $K^+\toπ^+ν\barν$ branching ratio at the NA62 experiment Chang, Xiafei Collaboration, for the NA62 High Energy Physics - Experiment The ultra-rare decay $K^+\toπ^+ν\barν$ is a golden mode in flavor physics. The Standard Model prediction for its branching ratio is below $10^{-10}$. This decay mode is highly sensitive to new physics models at mass scales up to $\mathcal{O}(100\,\mathrm{TeV})$. The NA62 experiment at CERN SPS is designed to measure this decay mode. A preliminary result of the branching ratio measurement using data collected in 2023--2024 is presented. With the new dataset, the NA62 experiment doubled its signal sample while reducing the background in proportion. Combining the data collected in 2016--2024, the branching ratio is measured to be $\mathcal{B}(K^+\toπ^+ν\barν) = \left(9.6^{+1.9}_{-1.8}\right)\times10^{-11}$. The result is compatible with the Standard Model prediction with a precision better than $20\%$. |
| title | New measurement of $K^+\toπ^+ν\barν$ branching ratio at the NA62 experiment |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.12649 |