Abstract
Precision measurements of free-neutron β decay have been used to precisely constrain our understanding of the weak interaction. However, the neutron Fierz interference term bn, which is particularly sensitive to beyond-standard-model tensor currents at the TeV scale, has thus far eluded measurement. Here we report the first direct constraints on this term, finding bn=0.067±0.005stat−0.061+0.090sys, consistent with the standard model. The uncertainty is dominated by absolute energy reconstruction and the linearity of the β spectrometer energy response.Received 7 July 2017Corrected 6 November 2017DOI:https://doi.org/10.1103/PhysRevC.96.042501©2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBeta decayElectroweak interactionElectroweak interactions in nuclear physicsExtensions of fermion sectorNeutron physicsParticle decaysParticle interactionsPhysical SystemsNeutronsParticles & FieldsNuclear PhysicsAccelerators & Beams
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