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In the standard model of particle physics, the weak interaction is describedby vector and axial-vector couplings only. Non-zero scalar or tensorinteractions would imply an additional contribution to the differential decayrate of the neutron, the Fierz interference term. We derive a limit on thishypothetical term from a measurement using spin polarized neutrons. This methodis statistically less sensitive than the determination from the spectral shapebut features much cleaner systematics. We obtain a limit of b = 0.017(21) at68.27 C.L., improving the previous best limit from neutron decay by a factor offour.

Limit on the Fierz Interference Term b from a Measurement of the Beta Asymmetry in Neutron Decay