Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.112501
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Funding
- German Research Foundation [SPP 1491, MA 4944/1-2, AB 128/5-2, SO 1058/1-1]
- Austrian Science Fund [P 26636-N20, W1252-N27]
- German Federal Ministry for Research and Education [06HD153I, 06HD187]
- DFG cluster of excellence Origin and Structure of the Universe
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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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