Estimates of the isospin-violating ${\Lambda }_b\to {\Sigma }^0\varphi ,{\Sigma }^{0}J/\psi$ decays and the $\Sigma -\Lambda$ mixing

Zhou Rui, Jia-Ming Li, Chao-Qi Zhang

We analyse the two purely isospin-violating decays ${\Lambda }_b\to {\Sigma }^0\varphi$ and ${\Lambda }_b\to {\Sigma }^{0}J/\psi$, proceed merely via the exchange topologies, in the framework of perturbative…