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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...

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Bibliographic Details
Main Authors: Märkisch, Bastian (Author) , Mest, Holger (Author) , Abele, Hartmut (Author) , Dubbers, Dirk (Author) , Roick, Christoph (Author) , Werder, Dominik (Author)
Format: Article (Journal)
Language:English
Published: 21 June 2019
In: Physical review letters
Year: 2019, Volume: 122, Issue: 24
ISSN:1079-7114
DOI:10.1103/PhysRevLett.122.242501
Online Access: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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Author Notes: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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Summary: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.
Item Description:Gesehen am 07.08.2019
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.122.242501

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