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Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay

J. C. Hardy I. S. Towner

J. C. Hardy, I. S. Towner. Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay[J]. 原子核物理评论, 2016, 33(2): 207-211. doi: 10.11804/NuclPhysRev.33.02.207
引用本文: J. C. Hardy, I. S. Towner. Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay[J]. 原子核物理评论, 2016, 33(2): 207-211. doi: 10.11804/NuclPhysRev.33.02.207
J. C. Hardy, I. S. Towner. Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay[J]. Nuclear Physics Review, 2016, 33(2): 207-211. doi: 10.11804/NuclPhysRev.33.02.207
Citation: J. C. Hardy, I. S. Towner. Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay[J]. Nuclear Physics Review, 2016, 33(2): 207-211. doi: 10.11804/NuclPhysRev.33.02.207

Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay

doi: 10.11804/NuclPhysRev.33.02.207

Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay

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出版历程
  • 刊出日期:  2016-06-20

Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay

doi: 10.11804/NuclPhysRev.33.02.207

摘要: Superallowed nuclear beta decay between 0+ analog states is a sensitive probe of the weak interaction, with the established strength – or Ft value – of each such transition being a direct measure of the vector coupling constant, GV. Each transition’s Ft value depends on the half-life of the parent nucleus as well as on the Q-value and branching ratio for the transition of interest. It also depends on small (1%) transition-dependent theoretical corrections, of which the most sensitive accounts for isospin symmetry breaking. We have recently published a new survey of world superallowed-decay data, which establishes the Ft values of 14 separate superallowed transitions to a precision of order 0.1% or better. The results from this very robust data set yield the value of Vud, the up-down quark mixing element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, and lead to the most demanding test available of CKM unitarity. The survey results and their outcome are described, as is the current direction of experiments that focus on testing the validity of the isospin-symmetry-breaking corrections.

English Abstract

J. C. Hardy, I. S. Towner. Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay[J]. 原子核物理评论, 2016, 33(2): 207-211. doi: 10.11804/NuclPhysRev.33.02.207
引用本文: J. C. Hardy, I. S. Towner. Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay[J]. 原子核物理评论, 2016, 33(2): 207-211. doi: 10.11804/NuclPhysRev.33.02.207
J. C. Hardy, I. S. Towner. Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay[J]. Nuclear Physics Review, 2016, 33(2): 207-211. doi: 10.11804/NuclPhysRev.33.02.207
Citation: J. C. Hardy, I. S. Towner. Testing CVC and CKM Unitarity via Superallowed Nuclear Beta Decay[J]. Nuclear Physics Review, 2016, 33(2): 207-211. doi: 10.11804/NuclPhysRev.33.02.207

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