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We measure the time-dependent $CP$ asymmetry in the radiative-penguin decay$B^0 \to {{K^0_{S}}} \pi^- \pi^+ \gamma$, using a sample of $471$ million$\Upsilon(4S) \to B{\kern 0.18em\overline{\kern -0.18em B}}$ events recordedwith the BaBar detector at the PEP-II $e^+e^-$ storage ring at SLAC. Usingevents with $m_{K\pi\pi}<1.8{\mathrm{\,Ge\kern -0.1em V/}c^2}$, we measure thebranching fractions of $B^+ \to K^+ \pi^- \pi^+ \gamma$ and $B^0 \to K^0 \pi^+\pi^- \gamma$, the branching fractions of the kaonic resonances decaying to$K^+ \pi^- \pi^+$, as well as the overall branching fractions of the $B^+ \to\rho^0 K^+ \gamma$, $B^+ \to K^{*0} \pi^+ \gamma$ and S-wave $B^+ \to (K\pi)^{*0}_0 \pi^+ \gamma$ components. For events from the $\rho$ mass band, wemeasure the $CP$-violating parameters${\mathcal{S}_{{{K^0_{S}}}\pi^+\pi^-\gamma}} = 0.14 \pm 0.25 \pm 0.03$ and${\mathcal{C}_{{{K^0_{S}}}\pi^+\pi^-\gamma}} = -0.39 \pm 0.20^{+0.03}_{-0.02}$,where the first uncertainties are statistical and the second are systematic. Weextract from this measurement the time-dependent $CP$ asymmetry related to the$CP$ eigenstate $\rho^0 {{K^0_{S}}}$ and obtain${\mathcal{S}_{{{K^0_{S}}}\rho\gamma}} = -0.18 \pm 0.32^{+ 0.06}_{-0.05}$,which provides information on the photon polarization in the underlying $b \tos \gamma$ transition.

physical review. d/physical review. d.

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