Measurement of the weak axial-vector coupling constant in the decay of free neutrons using a pulsed cold neutron beam
We present a precision measurement of the axial-vector coupling constant gA in the decay of polarized free neutrons. For the first time, a pulsed cold neutron beam was used for this purpose. By this method, leading sources of systematic uncertainty are suppressed. From the electron spectra we obtain...
Gespeichert in:
| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
21 June 2019
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| In: |
Physical review letters
Year: 2019, Jahrgang: 122, Heft: 24 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.122.242501 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1103/PhysRevLett.122.242501 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.122.242501 
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| Verfasserangaben: | B. Märkisch, H. Mest, H. Saul, X. Wang, H. Abele, D. Dubbers, M. Klopf, A. Petoukhov, C. Roick, T. Soldner, and D. Werder |
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| 245 | 1 | 0 | |a Measurement of the weak axial-vector coupling constant in the decay of free neutrons using a pulsed cold neutron beam |c B. Märkisch, H. Mest, H. Saul, X. Wang, H. Abele, D. Dubbers, M. Klopf, A. Petoukhov, C. Roick, T. Soldner, and D. Werder |
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| 520 | |a We present a precision measurement of the axial-vector coupling constant gA in the decay of polarized free neutrons. For the first time, a pulsed cold neutron beam was used for this purpose. By this method, leading sources of systematic uncertainty are suppressed. From the electron spectra we obtain λ=gA/gV=−1.27641(45)stat(33)sys, which confirms recent measurements with improved precision. This corresponds to a value of the parity violating beta asymmetry parameter of A0=−0.11985(17)stat(12)sys. We discuss implications on the Cabibbo-Kobayashi-Maskawa matrix element Vud and derive a limit on left-handed tensor interaction. | ||
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