Measurement of the $K^+\toπ^+γγ$ decay
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866913236080656384 |
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| author | The NA62 Collaboration |
| author_facet | The NA62 Collaboration |
| contents | A sample of 3984 candidates of the $K^+\toπ^+γγ$ decay, with an estimated background of $291\pm14$ events, was collected by the NA62 experiment at CERN during 2017-2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation theory was found to be necessary. The decay branching ratio in the full kinematic range is measured to be $(9.61\pm0.17)\times10^{-7}$. The first search for production and prompt decay of an axion-like particle with gluon coupling in the process $K^+\toπ^+a$, $a\toγγ$ is also reported. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_01837 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Measurement of the $K^+\toπ^+γγ$ decay The NA62 Collaboration High Energy Physics - Experiment High Energy Physics - Phenomenology A sample of 3984 candidates of the $K^+\toπ^+γγ$ decay, with an estimated background of $291\pm14$ events, was collected by the NA62 experiment at CERN during 2017-2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation theory was found to be necessary. The decay branching ratio in the full kinematic range is measured to be $(9.61\pm0.17)\times10^{-7}$. The first search for production and prompt decay of an axion-like particle with gluon coupling in the process $K^+\toπ^+a$, $a\toγγ$ is also reported. |
| title | Measurement of the $K^+\toπ^+γγ$ decay |
| topic | High Energy Physics - Experiment High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2311.01837 |