Published October 2017
| Submitted + Published
Journal Article
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First direct constraints on Fierz interference in free-neutron β decay
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 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 b_n=0.067±0.005_(stat)^(+0.090)_(−0.061)_(sys), consistent with the standard model. The uncertainty is dominated by absolute energy reconstruction and the linearity of the β spectrometer energy response.
Additional Information
© 2017 American Physical Society. Received 7 July 2017; published 30 October 2017. This work is supported in part by the US Department of Energy, Office of Nuclear Physics (DE-FG02-08ER41557, DE-SC0014622, DE-FG02-97ER41042) and the National Science Foundation (Grants No. NSF-0653222, No. NSF-0700491, No. NSF-0855538, No. NSF-1002814, No. NSF-1005233, No. NSF-1205977, No. NSF-1306997, No. NSF-1307426, No. 1506459, and No. NSF-1615153). We gratefully acknowledge the support of the LDRD program (20110043DR), and the LANSCE and AOT divisions of the Los Alamos National Laboratory.Attached Files
Published - PhysRevC.96.042501.pdf
Submitted - 1707.00776.pdf
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Additional details
- Eprint ID
- 80370
- Resolver ID
- CaltechAUTHORS:20170814-135120123
- DE-FG02-08ER41557
- Department of Energy (DOE)
- DE-SC0014622
- Department of Energy (DOE)
- DE-FG02-97ER41042
- Department of Energy (DOE)
- PHY-0653222
- NSF
- PHY-0700491
- NSF
- PHY-0855538
- NSF
- PHY-1002814
- NSF
- PHY-1005233
- NSF
- PHY-1306997
- NSF
- PHY-1307426
- NSF
- PHY-1506459
- NSF
- PHY-1615153
- NSF
- 20110043DR
- Los Alamos National Laboratory
- Created
-
2017-08-14Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field