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First direct constraints on Fierz interference in free-neutron β decay

Hickerson, K. P. and Sun, X. and Carr, R. and Filippone, B. W. and Liu, J. L. and Mendenhall, M. P. and Pérez Galván, A. and Picker, R. (2017) First direct constraints on Fierz interference in free-neutron β decay. Physical Review C, 96 (4). Art. No. 042501. ISSN 2469-9985. https://resolver.caltech.edu/CaltechAUTHORS:20170814-135120123

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevC.96.042501DOIArticle
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.96.042501PublisherArticle
https://arxiv.org/abs/1707.00776arXivDiscussion Paper
ORCID:
AuthorORCID
Sun, X.0000-0001-8817-4643
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.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-08ER41557
Department of Energy (DOE)DE-SC0014622
Department of Energy (DOE)DE-FG02-97ER41042
NSFPHY-0653222
NSFPHY-0700491
NSFPHY-0855538
NSFPHY-1002814
NSFPHY-1005233
UNSPECIFIEDPHY-1205977
NSFPHY-1306997
NSFPHY-1307426
NSFPHY-1506459
NSFPHY-1615153
Los Alamos National Laboratory20110043DR
Issue or Number:4
Record Number:CaltechAUTHORS:20170814-135120123
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170814-135120123
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80370
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 Aug 2017 22:40
Last Modified:03 Oct 2019 18:30

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