Updated Measurement of the CKM Angle alpha Using B0->rho+rho- Decays
Abstract
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 SLONG and CLONG: 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] SLONG = -0.19 +/- 0.21 [stat] +0.05/-0.07 [syst] CLONG = -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.
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