Is the Unitarity of the Quark-Mixing-CKM-Matrix Violated in Neutron Decay?
arXiv:hep-ex/0308062
Abstract
Measurements by various international groups of researchers determine the strength of the weak interaction of the neutron, which gives us unique information on the question of the quark mixing. Neutron decay experiments now challenge the Standard Model of elementary particle physics with a deviation, 2.7 times the stated error.
Plenary talk at the Workshop on the CKM Unitarity Triangle, IPPP Durham, April 2003 (eConf C0304052). 5 pages