$CP$ violation for $B^0\to {\rho }^0(\omega ){\rho }^0(\omega )\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ in QCD factorization

Gang Lü, Jia-Qi Lei, Xin-Heng Guo +2

In the QCD factorization (QCDF) approach we study the direct $CP$ violation in ${\bar{B}}^0\to {\rho }^0(\omega ){\rho }^0(\omega )\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ via the $\rho -\omega$ mixing mechanism. We find t…