In , the authors studied the Cabibbo-Kobayashi-Maskawa
matrix element [absolute value of [V.sub.ub]] which is not determined up to now in inclusive or exclusive B decays.
Perl and including discussions of electroweak measurements at the Large Hadron Collider at CERN (European Laboratory for Particle Physics), astrophysical sources of high-energy neutrinos in the IceCube era, hadronic parity nonconservation and its experimental implications, the Cabibbo-Kobayashi-Maskawa
matrix parameters, short-range correlations in nuclei, advances in bolometer technology for fundamental physics, reactor neutrino experiments, the progress of high-energy-density physics at the National Ignition Facility, the China Jinping Underground Laboratory and its programs, and neutron star mergers and nucleosynthesis of heavy elements.
Since neutron decay rate is proportional to the Cabibbo-Kobayashi-Maskawa
(CKM) matrix element squared, |[V.sub.ud]|[.sup.2], we can obtain [V.sub.ud] (the u and d quark mixing matrix) independently of the nuclear model.
However, in traditional approach not only is the electroweak phase transition not of first order, but the CP-violation from the Cabibbo-Kobayashi-Maskawa
matrix is too small, and to obtain the observed baryon asymmetry various extensions of the Standard Model have been proposed [4-7].
The new result for the neutron lifetime can be used for the unitarity test of Cabibbo-Kobayashi-Maskawa
In standard model (SM), CP violation is related to the weak complex phase in the Cabibbo-Kobayashi-Maskawa
(CKM) matrix [1, 2].
Particle decay data indicate that the Cabibbo-Kobayashi-Maskawa
matrix may deviate from unitarity (presently at the 2.7-sigma level ).
[[tau].sub.n] also opens the way to determine the coupling constants of the weak interaction and hence the element [V.sub.ud] of the Cabibbo-Kobayashi-Maskawa
(CKM) matrix precisely.
The other important goal of measuring the neutron lifetime with improved accuracy is to test unitarity of the Cabibbo-Kobayashi-Maskawa