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## Limit on the $B^0 \to \rho^0\rho^0$ Branching Fraction and Implications for the CKM Angle alpha

### Abstract

BABARWe 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

Topics: 13.25.Hw, 11.30.Er, 12.15.Hh, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: American Physical Society
Year: 2005
DOI identifier: 10.1103/PhysRevLett.94.131801
OAI identifier: oai:HAL:in2p3-00024130v1
Provided by: Hal-Diderot