Accurate Measurement of the Beta-Asymmetry in Neutron Decay Rules out Dark Decay Mode
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques(2020)
摘要
The question of the nature of dark matter is one of the major challenges of elementary particle physics. Not surprisingly, the recent suggestion of a dark decay channel as a solution to persisting discrepancies in neutron lifetime measurements has initiated substantial research activity. We discuss the accurate measurement of the parity violating β-asymmetry using Perkeo III. The result is about five times more precise than the current world average and resolves a long-standing discrepancy. Based on this, we largely rule out the dark decay mode interpretation. We derive a new world average of the weak axial coupling and obtain a competitive value of the first element of the quark mixing matrix Vud from neutron decay.
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关键词
neutron decay,weak interaction,parity violation
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