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

Abstract

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 ${\rm Y}(4S)\to B\overline{B}$ events recorded with the BaBar detector at the PEP-II $e^{+}{e}^{-}$ storage ring at SLAC. Using events with $m_{K\pi \pi }<1.8\mathrm{Ge}V/c^2$, we measure the branching 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 $B^{+}\to {\rho }^0{K}^{+}\gamma$, $B^{+}\to K^{\ast 0}{\pi }^{+}\gamma$ and S-wave $B^{+}\to (K\pi {)}_0^{\ast 0}{\pi }^{+}\gamma$ components. For events from the $\rho$ mass band, we measure the $CP$-violating parameters ${\mathcal{S}}_{K_S^0{\pi }^{+}{\pi }^{-}\gamma }=0.14\pm 0.25\pm 0.03$ and ${\mathcal{C}}_{K_S^0{\pi }^{+}{\pi }^{-}\gamma }=-0.39\pm 0.20_{-0.02}^{+0.03}$, where the first uncertainties are statistical and the second are systematic. We extract from this measurement the time-dependent $CP$ asymmetry related to the $CP$ eigenstate ${\rho }^0{K}_S^0$ and obtain ${\mathcal{S}}_{K_S^0\rho \gamma }=-0.18\pm 0.32_{-0.05}^{+0.06}$, which provides information on the photon polarization in the underlying $b\to s\gamma$ transition.

33 pages, 8 figures, submitted to PRD

References in corpus (3)

• Updated NNLO QCD predictions for the weak radiative B-meson decays
• Time-Dependent CP Asymmetries in B0 -> Ks pi0 gamma transitions
• Study of the K+ pi+ pi- Final State in B+ -> J/psi K+ pi+ pi- and B+ -> psi-prime K+ pi+ pi-

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