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Open Access. Powered by Scholars. Published by Universities.®

2017

Nuclear

Robert W. Pattie Jr.

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Full-Text Articles in Physics

First Direct Constraints On Fierz Interference In Free-Neutron Β Decay, Kevin P. Hickerson, Xiaohui Sun, Yelena Bagdasarova, David Bravo-Berguño, Leah J. Broussard, Peter Brown, Richard Carr, Scott Currie, Xinjian Ding, Bradley W. Filippone, Alejandro García, Peter Geltenbort, J. Todd Hoagland, A. T. Holley, Ran Hong, Takeyasu M. Ito, Andreas Knecht, Chao-Yu Liu, Jiang-Lai Liu, Mark Makela, Russell R. Mammei, J. W. Martin, Dan Melconian, Michael P. Mendenhall, Spencer D. Moore, Christopher L. Morris, Robert W. Pattie, A. Pérez Galván, Ruediger Picker, Margaret L. Pitt, Bradley R. Plaster, John C. Ramsey, Roger H. Rios, A. Saunders, Susan J. Seestrom, Eduard I. Sharapov, Walter E. Sondheim, Erdinch Tatar, R. Bruce Vogelaar, Brittney Vorndick, Christopher Wrede, Andrew R. Young, B. A. Zeck Nov 2017

First Direct Constraints On Fierz Interference In Free-Neutron Β Decay, Kevin P. Hickerson, Xiaohui Sun, Yelena Bagdasarova, David Bravo-Berguño, Leah J. Broussard, Peter Brown, Richard Carr, Scott Currie, Xinjian Ding, Bradley W. Filippone, Alejandro García, Peter Geltenbort, J. Todd Hoagland, A. T. Holley, Ran Hong, Takeyasu M. Ito, Andreas Knecht, Chao-Yu Liu, Jiang-Lai Liu, Mark Makela, Russell R. Mammei, J. W. Martin, Dan Melconian, Michael P. Mendenhall, Spencer D. Moore, Christopher L. Morris, Robert W. Pattie, A. Pérez Galván, Ruediger Picker, Margaret L. Pitt, Bradley R. Plaster, John C. Ramsey, Roger H. Rios, A. Saunders, Susan J. Seestrom, Eduard I. Sharapov, Walter E. Sondheim, Erdinch Tatar, R. Bruce Vogelaar, Brittney Vorndick, Christopher Wrede, Andrew R. Young, B. A. Zeck

Robert W. Pattie Jr.

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+0.090−0.061sys, consistent with the standard model. The uncertainty is dominated by absolute energy reconstruction and the linearity of the β spectrometer energy response.

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