Addressing the CKM unitarity problem with a vector-like up quark

Implications of CKM Unitarity

Three generation CKM Unitarity in the Standard Model predicts |Vud |2 + |Vus| + |Vub| = 1. Nuclear, K`3 and b → u decays currently give |Vud |2 + |Vus| + |Vub| = 0.9991(8). The good agreement between theory and experiment can be used to constrain “new physics” effects at the tree and quantum loop level. Examples considered are: exotic muon decays, heavy quark or lepton mixing, high scale induce...

And Ckm Unitarity

The Cabibbo-Kobayashi-Maskawa (CKM) [1,2] three-generation quark mixing matrix written in terms of the Wolfen-stein parameters (λ, A, ρ, η) [3] nicely illustrates the orthonor-mality constraint of unitarity and central role played by λ. V CKM = ⎛ ⎝ V ud V us V ub V cd V cs V cb V td V ts V tb ⎞ ⎠ = ⎛ ⎝ 1 − λ 2 /2 λ Aλ 3 (ρ − iη) −λ 1 − λ 2 /2 Aλ 2 Aλ 3 (1 − ρ − iη) −Aλ 2 1 ⎞ ⎠ +O(λ 4). (1) That...

3 decays and CKM unitarity *

We present a detailed numerical study of the Ke3 decays to O(p6, (md −mu)p, ep) in chiral perturbation theory with virtual photons and leptons. We describe the extraction of the CKM matrix element |Vus| from the experimental Ke3 decay parameters. We propose a consistency check of the K + e3 and K 0 e3 data that is largely insensitive to the dominating theoretical uncertainties, in particular th...

Is the Unitarity of the quark-mixing-CKM-matrix violated in neutron β-decay?

This article is about the interplay between the Standard Model of elementary particle physics and neutron β-decay. Since the Fermi decay constant is known from muon decay, the Standard Model describes neutron β-decay with only two additional parameters. One parameter is the first entry |Vud| of the CKMmatrix. The other one is λ, the ratio of the vector coupling constant and the axial vector con...

Workshop on the CKM Unitarity Triangle , IPPP