Lessons from LHCb and Belle II measurements of $B\to J/\psi \pi$ and $B\to J/\psi K$ decays

Zoltan Ligeti, Yosef Nir, Roy Schein

The LHCb collaboration has recently measured the CP asymmetry in $B^{+}\to J/\psi {\pi }^{+}$ decay, while the Belle II collaboration has recently measured the CP asymmetries in $B^0\to J/\psi {\pi }^0$…