Time-dependent analysis of $B^0\to K_S^0{\pi }^{-}{\pi }^{+}\gamma$ decays and studies of the $K^{+}{\pi }^{-}{\pi }^{+}$ system in $B^{+}\to K^{+}{\pi }^{-}{\pi }^{+}\gamma$ decays

P. del Amo Sanchez, others

We measure the time-dependent $CP$ asymmetry in the radiative-penguin decay $B^0\to K_S^0{\pi }^{-}{\pi }^{+}\gamma$, using a sample of $471$ million $Υ(4S) \to B{\kern 0.18em\overline{\kern…