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Measurement of CP Asymmetry in a Time-Dependent Dalitz Analysis of B^0 \to (\rho \pi)^0 and a Constraint on the Quark Mixing Matrix Angle \phi_2
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abstract
We present a measurement of CP asymmetry using a time-dependent Dalitz plot analysis of B0 --> pi+pi-pi0 decays based on a 414/fb data sample containing 449M BB pairs. The data was collected on the $\Upsilon$(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. Combining our analysis with information on charged B decay modes, we perform a full Dalitz and isospin analysis and obtain a constraint on the CKM angle $\phi_2$, 68 deg. < $\phi_2$ < 95 deg. as the 68.3% confidence interval for the $\phi_2$ solution consistent with the standard model (SM). A large SM-disfavored region also remains.
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Cited by 1 Pith paper
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Method to study $CP$ violation in $B_s^0\to K_S K^\pm \pi^\mp$ decays
A method is developed to relate amplitudes for B_s^0 → K_S K* resonances in the two final states, enabling the first tagged decay-time-dependent Dalitz analysis to measure the effective weak phase φ_s^eff.
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