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Title: Limit on the B0→ρ0ρ0 Branching Fraction and Implications for the Cabibbo-Kobayashi-Maskawa Angle α
Author: Graugés Pous, Eugeni
BABAR Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 8-Apr-2005
Publisher: American Physical Society
Abstract: We search for the decay B 0 → ρ 0 ρ 0 in a data sample of about 227 × 10 6 Υ ( 4 S ) → B ¯¯¯ B 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 → ρ ρ decays is decreased to 11° at 68% C.L.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2005, vol. 94, num. 13, p. 131801
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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