CKM unitarity triangle

What you are seeing: the CKM unitarity condition $V_{ud}V^*_{ub} + V_{cd}V^*_{cb} + V_{td}V^*_{tb} = 0$ drawn as three complex side-vectors added tip-to-tail, closing the triangle with vertices $(0,0)$, $(1,0)$, $(\bar\rho, \bar\eta)$ and angles $\alpha, \beta, \gamma$. The enclosed area is the Jarlskog invariant, so the CP-asymmetry panel shows the $B^0$ vs $\bar B^0$ golden-mode rates ($\propto \sin 2\beta$): a flat triangle gives equal rates (no CP violation), a fat one a large asymmetry. Drag $\bar\rho, \bar\eta$ to move the apex.