  We present results from an analysis of B0->rho+rho- using 316fb^-1 of Y(4S)
-> B0B0bar decays observed with the BaBar detector at the PEP-II
asymmetric-energy B Factory at SLAC. We measure the B0->rho+rho- branching
fraction, longitudinal polarization fraction fL, and the CP-violating
parameters S_LONG and C_LONG:
  B(B0->rho+rho-) = (23.5 +/- 2.2 [stat] +/- 4.1 [syst]) * 10^-6, fL = 0.977
+/- 0.024 [stat] +0.015/-0.013 [syst]
  S_LONG = -0.19 +/- 0.21 [stat] +0.05/-0.07 [syst]
  C_LONG = -0.07 +/- 0.15 [stat] +/- 0.06 [syst]
  Using an isospin analysis of B->rhorho decays we determine the angle alpha of
the unitarity triangle. One of the two solutions, alpha = [74, 117] degrees at
68% CL, is compatible with the standard model. All results presented here are
preliminary.
