We search for the decay B0→ρ0ρ0 in a data sample of about 227×10^6 Υ(4S)→BB̅ 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% C.L. on the branching fraction. As a result, the uncertainty due to penguin contributions on the Cabibbo-Kobayashi-Maskawa unitarity angle α measured in B→ρρ decays is decreased to 11° at 68% C.L.
Limit on the B0→ρ0ρ0 Branching Fraction and Implications for the Cabibbo-Kobayashi-Maskawa Angle α
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;SIMI, GABRIELE;
2005
Abstract
We search for the decay B0→ρ0ρ0 in a data sample of about 227×10^6 Υ(4S)→BB̅ 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% C.L. on the branching fraction. As a result, the uncertainty due to penguin contributions on the Cabibbo-Kobayashi-Maskawa unitarity angle α measured in B→ρρ decays is decreased to 11° at 68% C.L.File in questo prodotto:
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