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.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). Limit on the B0→ρ0ρ0 branching fraction and implications for the Cabibbo-Kobayashi-Maskawa Angle α. PHYSICAL REVIEW LETTERS, 94(13) [10.1103/PhysRevLett.94.131801].

Limit on the B0→ρ0ρ0 branching fraction and implications for the Cabibbo-Kobayashi-Maskawa Angle α

CARPINELLI, Massimo;
2005

Abstract

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.
Articolo in rivista - Articolo scientifico
BABAR detector
English
2005
94
13
131801
none
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). Limit on the B0→ρ0ρ0 branching fraction and implications for the Cabibbo-Kobayashi-Maskawa Angle α. PHYSICAL REVIEW LETTERS, 94(13) [10.1103/PhysRevLett.94.131801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389851
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