Limit on the B-0 ->rho(0)rho(0) branching fraction and implications for the Cabibbo-Kobayashi-Maskawa angle alpha

Journal article

We search for the decay B0 → ρ0ρ 0 in a data sample of about 227 × 106 Γ(4S) → B B̄ 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. © 2005 The American Physical Society.

Authors: Aubert, B; Barate, R; Boutigny, D; Couderc, F; Karyotakis, Y

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 94
• Issue: 13
• Publication date: 2005-04-08
• DOI: 10.1103/PhysRevLett.94.131801
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English