2015/09/15 by J. C. Hardy, Hardy, J. C., I. S. Towner +2
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Nuclear physics research studies #Particle physics theoretical and experimental studies #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.48550/arxiv.1509.04743
Talk presented CIPANP2015. 8 pages, LaTeX, 2 eps figures
arxiv created 2015/09/15 · openalex publication_date 2015/09/15 · arxiv updated 2015/09/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The Vud element of the Cabibbo-Kobayashi-Maskawa matrix can be determined from several different experimental approaches: either 0+-to-0+ superallowed nuclear beta decays, neutron decay, nuclear mirror decays, or pion beta decay. Currently all give consistent results but, because the nuclear superallowed value has an uncertainty at least a factor of seven less than all other results, it dominates the result. A new survey of world superallowed-decay data establishes the Ft values of 14 separate superallowed transitions to a precision of order 0.1% or better; and all 14 are statistically consistent with one another. This very robust data set yields the result Vud = 0.97417(21), the value we recommend.