Recoil-Order and Radiative Corrections to the aCORN Experiment
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909124329996288 |
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| author | Wietfeldt, F. E. Byron, W. A. Collett, B. Dewey, M. S. Gentile, T. R. Gluck, F. Hassan, M. T. Jones, G. L. Komives, A. Nico, J. S. Stephenson, E. J. |
| author_facet | Wietfeldt, F. E. Byron, W. A. Collett, B. Dewey, M. S. Gentile, T. R. Gluck, F. Hassan, M. T. Jones, G. L. Komives, A. Nico, J. S. Stephenson, E. J. |
| contents | The aCORN experiment measures the electron-antineutrino $a$-coefficient in free neutron decay. We update the previous aCORN results to include radiative and recoil corrections to first order, and discuss a key issue in the comparison of results from different $a$-coefficient experimental methods when these effects are considered. The corrected combined result is $\overline{a} = -0.10779 \pm 0.00125\, ({\rm stat}) \pm 0.00133\, ({\rm sys})$, averaged over the full Fermi neutron beta spectrum. The corresponding corrected result for the ratio of weak coupling constants $λ= G_A/G_V$ is $λ= -1.2712 \pm 0.0061$. This improves agreement with previous $a$-coefficient experiments, in particular the 2020 aSPECT result |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2306_15042 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Recoil-Order and Radiative Corrections to the aCORN Experiment Wietfeldt, F. E. Byron, W. A. Collett, B. Dewey, M. S. Gentile, T. R. Gluck, F. Hassan, M. T. Jones, G. L. Komives, A. Nico, J. S. Stephenson, E. J. Nuclear Experiment The aCORN experiment measures the electron-antineutrino $a$-coefficient in free neutron decay. We update the previous aCORN results to include radiative and recoil corrections to first order, and discuss a key issue in the comparison of results from different $a$-coefficient experimental methods when these effects are considered. The corrected combined result is $\overline{a} = -0.10779 \pm 0.00125\, ({\rm stat}) \pm 0.00133\, ({\rm sys})$, averaged over the full Fermi neutron beta spectrum. The corresponding corrected result for the ratio of weak coupling constants $λ= G_A/G_V$ is $λ= -1.2712 \pm 0.0061$. This improves agreement with previous $a$-coefficient experiments, in particular the 2020 aSPECT result |
| title | Recoil-Order and Radiative Corrections to the aCORN Experiment |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2306.15042 |