The Quasi-Riemann Hypothesis (alternate 11/12 proof)

Abstract — v1

We establish the quasi-Riemann hypothesis by proving that every Dirichlet $L$-function, including Riemann's zeta function, has no zeros in the half-plane $\operatorname{Re}s>11/12$. More generally, we prove the same zero-free half-plane for every finite-order Hecke $L$-function over $K=\mathbb Q(\sqrt{-3})$. In particular, this rules out the existence of Landau–Siegel zeros.