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We have measured the branching fraction B, longitudinal polarization fractionf_L, and CP asymmetry coefficients A and S for B0->rho+rho- decays with theBelle detector at the KEKB e+e- collider using 253 fb-1 of data. We obtain B =[22.8 +-3.8 (stat) +2.3 -2.6 (syst) ] x 10-6, f_L = 0.941 +0.034 -0.040 (stat)+-0.030 (syst), A = 0.00 +-0.30 (stat) +-0.09 (syst), and S = 0.08 +-0.41(stat) +-0.09 (syst). These values are used to constrain theCabibbo-Kobayashi-Maskawa phase phi_2; the solution consistent with theStandard Model is phi_2 = (88 +-17) degrees or 59 deg.< phi_2 < 115 deg. at 90%CL.Comment: 10 pages, 3 figures, 1 table, version published in Physical Review  Letters. Only wording changes to reduce lengt

physical review letters

Measurement of the Branching Fraction, Polarization, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>Asymmetry for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>ρ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>ρ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Decays, and Determination of the …

Measurement of the Branching Fraction, Polarization, andCPAsymmetry forB0→ρ+ρ−Decays, and Determination of the …