Limit on the B0->rho0rho0 Branching Fraction and Implications for the CKM Angle alpha

Details Limit on the B0->rho0rho0 Branching Fraction and Implications for the CKM Angle alpha Limit on the B0->rho0rho0 Branching Fraction and Implications for the CKM Angle alpha

2004-12-23

arxiv.org/abs/hep-ex/0412067v1

Phys.Rev.Lett.94:131801,2005

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 4 postscript figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.94.131801

We search for the decay B0 -> rho0 rho0 in a data sample of about 227 million Upsilon(4S)-> BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We find no significant signal and set an upper limit of 1.1*10^-6 at 90% CL on the branching fraction. As a result, the uncertainty due to penguin contributions on the CKM unitarity angle alpha measured in B -> rho rho decays is 11 degrees at 68% CL.

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