Limit on the Fierz interference term β [beta] from a measurement of the beta asymmetry in neutron decay
In the standard model of particle physics, the weak interaction is described by vector and axial-vector couplings only. Nonzero scalar or tensor interactions would imply an additional contribution to the differential decay rate of the neutron, the Fierz interference term. We derive a limit on this h...
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| Hauptverfasser: | , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
9 September 2020
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| In: |
Physical review letters
Year: 2020, Jahrgang: 125, Heft: 11 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.125.112501 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.125.112501 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.125.112501 
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| Verfasserangaben: | H. Saul, C. Roick, H. Abele, H. Mest, M. Klopf, A. K. Petukhov, T. Soldner, X. Wang, D. Werder, B. Märkisch |
| Zusammenfassung: | In the standard model of particle physics, the weak interaction is described by vector and axial-vector couplings only. Nonzero scalar or tensor interactions would imply an additional contribution to the differential decay rate of the neutron, the Fierz interference term. We derive a limit on this hypothetical term from a measurement using spin-polarized neutrons. This method is statistically less sensitive than the determination from the spectral shape but features much cleaner systematics. We obtain a limit of b=0.017(21) at 68.27% C.L., improving the previous best limit from neutron decay by a factor of four. |
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| Beschreibung: | Gesehen am 10.11.2020 |
| Beschreibung: | Online Resource |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.125.112501 |