Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2004-12-15
Phys.Rev. C71 (2005) 055501
Physics
Nuclear Physics
Nuclear Theory
64 pages, 4 postscript figures
Scientific paper
10.1103/PhysRevC.71.055501
A complete and critical survey is presented of all half-life, decay-energy and branching-ratio measurements related to 20 superallowed decays; no measurements are ignored, though some are rejected for cause and others updated. A new calculation of the statistical rate function is described and experimental ft values determined. The associated theoretical corrections needed to convert these results into Ft values are discussed, and careful attention is paid to the origin and magnitude of their uncertainties. As an exacting confirmation of the conserved vector current hypothesis, the Ft values are seen to be constant to 3 parts in 10^4. These data are also used to set new limits on any possible scalar interactions or right-hand currents. The average Ft value obtained from the survey, when combined with the muon lifetime, yields the CKM matrix element Vud = 0.9738(4); and the unitarity test on the top row of the matrix becomes |Vud|^2 + |Vus|^2 + |Vub|^2 = 0.9966(14) using the PDG's currently recommended values for Vus and Vub. We discuss the priorities for future theoretical and experimental work with the goal of making the CKM unitarity test more definitive.
Hardy J. C.
Towner Ian S.
No associations
LandOfFree
Superallowed nuclear beta decays: A critical survey with tests of CVC and the standard model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Superallowed nuclear beta decays: A critical survey with tests of CVC and the standard model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superallowed nuclear beta decays: A critical survey with tests of CVC and the standard model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-92967