Observation of the $K^{+}\rightarrowπ^{+}ν\barν$ decay and measurement of its branching ratio
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866910847181258752 |
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| author | NA62 Collaboration |
| author_facet | NA62 Collaboration |
| contents | A measurement of the $K^{+}\rightarrowπ^{+}ν\barν$ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, after modifications to the beamline and detectors, at a higher instantaneous beam intensity with respect to the 2016--2018 data taking. Combining NA62 data collected in 2016--2022, a measurement of $B(K^{+}\rightarrowπ^{+}ν\barν) = \left( 13.0^{+ 3.3}_{- 3.0} \right)\times10^{-11}$ is reported. With $51$ signal candidates observed and an expected background of $18^{+3}_{-2}$ events, $B(K^{+}\rightarrowπ^{+}ν\barν)$ becomes the smallest branching ratio measured with a signal significance above $5\,σ$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_12015 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of the $K^{+}\rightarrowπ^{+}ν\barν$ decay and measurement of its branching ratio NA62 Collaboration High Energy Physics - Experiment A measurement of the $K^{+}\rightarrowπ^{+}ν\barν$ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, after modifications to the beamline and detectors, at a higher instantaneous beam intensity with respect to the 2016--2018 data taking. Combining NA62 data collected in 2016--2022, a measurement of $B(K^{+}\rightarrowπ^{+}ν\barν) = \left( 13.0^{+ 3.3}_{- 3.0} \right)\times10^{-11}$ is reported. With $51$ signal candidates observed and an expected background of $18^{+3}_{-2}$ events, $B(K^{+}\rightarrowπ^{+}ν\barν)$ becomes the smallest branching ratio measured with a signal significance above $5\,σ$. |
| title | Observation of the $K^{+}\rightarrowπ^{+}ν\barν$ decay and measurement of its branching ratio |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2412.12015 |