Electroweak $\hat{I}{\cdot }_{\mathrm{w}}$ meson

Gia Dvali, Archil Kobakhidze, Otari Sakhelashvili

We argue that the Standard Model is accompanied by a new pseudo-scalar degree of freedom, $\hat{I}{\cdot }_{\mathrm{w}}$-meson, which cancels the topological susceptibility of the electroweak vacuum…