Journal
PHYSICAL REVIEW C
Volume 96, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.96.042501
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Funding
- US Department of Energy, Office of Nuclear Physics [DE-FG02-08ER41557, DE-SC0014622, DE-FG02-97ER41042]
- National Science Foundation [NSF-0653222, NSF-0700491, NSF-0855538, NSF-1002814, NSF-1005233, NSF-1205977, NSF-1306997, NSF-1307426, 1506459, NSF-1615153]
- LDRD program [20110043DR]
- LANSCE division of the Los Alamos National Laboratory
- AOT division of the Los Alamos National Laboratory
- U.S. Department of Energy (DOE) [DE-SC0014622] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien
- Division Of Physics [1506459, 1306997] Funding Source: National Science Foundation
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Precision measurements of free-neutron beta decay have been used to precisely constrain our understanding of the weak interaction. However, the neutron Fierz interference term b(n), 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 +/- 0.005(stat-0.061sys)(+0.090), consistent with the standard model. The uncertainty is dominated by absolute energy reconstruction and the linearity of the beta spectrometer energy response.
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