arXiv subjects
Publications and source records attributed to Dan-Di Wu.
I suggest two new unitarity tests for the quark charged current coupling constants which are $(sin γ/sin α) = ζ$, and $(sin 2γ)/(sin 2α) = - ((1-ζcos β))/(cos β-ζ)$ where $ζ$ is a CKM parameter defined in the text. These unitarity identities do not suffer some of the multi-value ambiguities. Related problems are discussed. The sign of $Δm_{_{B_d}}$ should satisfy the condition $Δm cos 2β< 0$.
Rephasing invariant formalism for the $K^0-\bar K^0$ system is recommended for the Particle Data Group. This formalism is accurate and prevents possible errors in generalizing the formalism to other systems, as well as in using CKM matrices not included in the Particle Data Book.
A small upper-bound is obtained for the CP phase $δ$ in a CKM matrix, $|\sinδ| \le 0.44$ based on CP independent data on $|V_{ub}/V_{cb}|$ alone. Potential inconsistencies with the CKM model in existing data which need a theory beyond the standard model to overcome emerge in the analysis using this CKM matrix. In addition, all CP asymmetry measurables for the $B_d- \bar B_d$ system are expressed solely by the CP phases in the decay amplitudes. Remarkably the CP asymmetry of the bench mark process $B_d\to ψK_S$ equals sin$2δ$. This will soon be measured by BaBar and Belle to confront the above upper-bound.
The tree level diagonalization of a neutrino mass matrix with both Majorana and Dirac masses is discussed in a general context. Flavor changing neutral currents in such models are inevitable. Rephasing invariant quantities characterizing CP violation in FCNC Fermion-Higgs interactions are identified. At the one loop level, the mass eigenstates become an impure Majorana type. The possibility of a significant change in the mass spectrum for the left-handed neutrinos is explored, with an example of two species of neutrinos. Neutrino oscillations with impure Majorana neutrinos are also discussed.