Limit on the Fierz Interference Term b from a Measurement of the Beta Asymmetry in Neutron Decay

被引：19
|
作者：
Saul, H. [1 ]
Roick, C. [1 ]
Abele, H. [1 ,2 ,3 ]
Mest, H. [3 ]
Klopf, M. [2 ]
Petukhov, A. K. [4 ]
Soldner, T. [4 ]
Wang, X. [1 ,2 ]
Werder, D. [3 ]
Maerkisch, B. [1 ,3 ]
机构：
[1] Tech Univ Munich, Phys Dept ENE, James Franck Str 1, D-85748 Garching, Germany
[2] Tech Univ Wien, Atominst, Stadionallee 2, A-1020 Vienna, Austria
[3] Heidelberg Univ, Phys Inst, Neuenheimer Feld 226, D-69120 Heidelberg, Germany
[4] Inst Laue Langevin, 71 Ave Martyrs,CS 20156, F-38042 Grenoble 9, France
来源：
PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 11期
基金：
奥地利科学基金会;
关键词：
CORRELATION-COEFFICIENTS; SPECTROMETER; NUCLEAR;
D O I：
10.1103/PhysRevLett.125.112501
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In the standard model of particle physics, the weak interaction is described by vector and axial-vector couplings only. Nonzero scalar or tensor interactions would imply an additional contribution to the differential decay rate of the neutron, the Fierz interference term. We derive a limit on this hypothetical term from a measurement using spin-polarized neutrons. This method is statistically less sensitive than the determination from the spectral shape but features much cleaner systematics. We obtain a limit of b = 0.017(21) at 68.27% C.L., improving the previous best limit from neutron decay by a factor of four.
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页数：7
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