Evidence for the B0->rho0rho0 Decay and Implications for the CKM Angle alpha

Details Evidence for the B0->rho0rho0 Decay and Implications for the CKM Angle alpha Evidence for the B0->rho0rho0 Decay and Implications for the CKM Angle alpha

2006-07-28

arxiv.org/abs/hep-ex/0607097v1

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 3 postscript figures, submitted to ICHEP2006

Scientific paper

We search for the decays B0->rho0rho0, B0->rho0f0, and B0->f0f0 in a sample of about 348 million Upsilon(4S)->BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We find evidence for B0->rho0rho0 with 3.0 sigma significance and measure the branching fraction B = (1.16 +0.37-0.36 +-0.27) 10^{-6} and longitudinal polarization fraction f_L = 0.86 +0.11-0.13 +-0.05. As a consequence, the uncertainty on the CKM unitarity angle alpha due to penguin contributions in B->rhorho decays is estimated to be 18 degrees at 1 sigma level. We also set upper limits on the B0->rho0f0 and B0->f0f0 decay rates. All results are preliminary.

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