Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.242501
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Funding
- German Research Foundation (DFG) [SPP 1491, MA 4944/1-2, AB 128/5-2, SO 1058/1-1]
- Austrian Science Fund (FWF) [P 26636-N20]
- German Federal Ministry for Research and Education [06HD153I, 06HD187]
- DFG cluster of excellence Origin and Structure of the Universe
- Austrian Science Fund (FWF) [P26636] Funding Source: Austrian Science Fund (FWF)
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We present a precision measurement of the axial-vector coupling constant g(A) 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 lambda = g(A)/g(V) = -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 A(0) = -0.11985 (17)(stat)(12)(sys). We discuss implications on the Cabibbo-Kobayashi-Maskawa matrix element V-ud and derive a limit on left-handed tensor interaction.
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