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Mendenhall, P. Geltenbort, R. B. Vogelaar, R. Carr, R. Hong, R. Picker, R. Rios, R. R. Mammei, R. W. Pattie, S. Currie, S. D. Moore, S. J. Seestrom, T. M. Ito, W. E. Sondheim, X. Ding, X. Sun, Y. Bagdasarova","submitted_at":"2017-07-03T23:06:42Z","abstract_excerpt":"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 $b_n = 0.067 \\pm 0.005_{\\text{stat}} {}^{+0.090}_{- 0.061}{}_{\\text{sys}}$, consistent with the Standard Model. 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