Belle II reports B(B0 -> rho+ rho-) = (2.89 +0.23/-0.22 +0.29/-0.27) x 10^-5, f_L = 0.921 +0.024/-0.025 +0.017/-0.015, S = -0.26 +/- 0.19 +/- 0.08, C = -0.02 +/- 0.12 +0.06/-0.05, and a derived phi2 = (92.6 +4.5/-4.7) degrees.
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Measurement of the branching fraction, polarization, and time-dependent $CP$ asymmetry in $B^0 \to \rho^+\rho^-$ decays and constraint on the CKM angle $\phi_2$
Belle II reports B(B0 -> rho+ rho-) = (2.89 +0.23/-0.22 +0.29/-0.27) x 10^-5, f_L = 0.921 +0.024/-0.025 +0.017/-0.015, S = -0.26 +/- 0.19 +/- 0.08, C = -0.02 +/- 0.12 +0.06/-0.05, and a derived phi2 = (92.6 +4.5/-4.7) degrees.