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Title: 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$$+0.090\atop{-0.061}$$ sys, consistent with the standard model. Lastly, the uncertainty is dominated by absolute energy reconstruction and the linearity of the β spectrometer energy response.

Authors:
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Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
UCNA Collaboration
OSTI Identifier:
1481655
Alternate Identifier(s):
OSTI ID: 1405550
Grant/Contract Number:  
AC05-00OR22725; FG02-08ER41557; SC0014622; FG02-97ER41042
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Hickerson, K. P., Sun, X., Bagdasarova, Y., Bravo-Berguño, D., Broussard, L. J., Brown, M. A. -P., Carr, R., Currie, S., Ding, X., Filippone, B. W., García, A., Geltenbort, P., Hoagland, J., Holley, A. T., Hong, R., Ito, T. M., Knecht, A., Liu, C. -Y., Liu, J. L., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Mendenhall, M. P., Moore, S. D., Morris, C. L., Pattie, R. W., Pérez Galván, A., Picker, R., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sondheim, W. E., Tatar, E., Vogelaar, R. B., VornDick, B., Wrede, C., Young, A. R., and Zeck, B. A. First direct constraints on Fierz interference in free-neutron β decay. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.042501.
Hickerson, K. P., Sun, X., Bagdasarova, Y., Bravo-Berguño, D., Broussard, L. J., Brown, M. A. -P., Carr, R., Currie, S., Ding, X., Filippone, B. W., García, A., Geltenbort, P., Hoagland, J., Holley, A. T., Hong, R., Ito, T. M., Knecht, A., Liu, C. -Y., Liu, J. L., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Mendenhall, M. P., Moore, S. D., Morris, C. L., Pattie, R. W., Pérez Galván, A., Picker, R., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sondheim, W. E., Tatar, E., Vogelaar, R. B., VornDick, B., Wrede, C., Young, A. R., & Zeck, B. A. First direct constraints on Fierz interference in free-neutron β decay. United States. doi:10.1103/PhysRevC.96.042501.
Hickerson, K. P., Sun, X., Bagdasarova, Y., Bravo-Berguño, D., Broussard, L. J., Brown, M. A. -P., Carr, R., Currie, S., Ding, X., Filippone, B. W., García, A., Geltenbort, P., Hoagland, J., Holley, A. T., Hong, R., Ito, T. M., Knecht, A., Liu, C. -Y., Liu, J. L., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Mendenhall, M. P., Moore, S. D., Morris, C. L., Pattie, R. W., Pérez Galván, A., Picker, R., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sondheim, W. E., Tatar, E., Vogelaar, R. B., VornDick, B., Wrede, C., Young, A. R., and Zeck, B. A. Mon . "First direct constraints on Fierz interference in free-neutron β decay". United States. doi:10.1103/PhysRevC.96.042501. https://www.osti.gov/servlets/purl/1481655.
@article{osti_1481655,
title = {First direct constraints on Fierz interference in free-neutron β decay},
author = {Hickerson, K. P. and Sun, X. and Bagdasarova, Y. and Bravo-Berguño, D. and Broussard, L. J. and Brown, M. A. -P. and Carr, R. and Currie, S. and Ding, X. and Filippone, B. W. and García, A. and Geltenbort, P. and Hoagland, J. and Holley, A. T. and Hong, R. and Ito, T. M. and Knecht, A. and Liu, C. -Y. and Liu, J. L. and Makela, M. and Mammei, R. R. and Martin, J. W. and Melconian, D. and Mendenhall, M. P. and Moore, S. D. and Morris, C. L. and Pattie, R. W. and Pérez Galván, A. and Picker, R. and Pitt, M. L. and Plaster, B. and Ramsey, J. C. and Rios, R. and Saunders, A. and Seestrom, S. J. and Sharapov, E. I. and Sondheim, W. E. and Tatar, E. and Vogelaar, R. B. and VornDick, B. and Wrede, C. and Young, A. R. and Zeck, B. A.},
abstractNote = {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$+0.090\atop{-0.061}$sys, consistent with the standard model. Lastly, the uncertainty is dominated by absolute energy reconstruction and the linearity of the β spectrometer energy response.},
doi = {10.1103/PhysRevC.96.042501},
journal = {Physical Review C},
number = 4,
volume = 96,
place = {United States},
year = {2017},
month = {10}
}

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