We present measurements of the branching fractions, longitudinal polarization, and direct CP-violation asymmetries for the decays B +→ρ0K*+ and B +→f0(980)K*+ with a sample of (467±5)×106BB̄ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the SLAC National Accelerator Laboratory. We observe B+→ρ 0K*+ with a significance of 5.3σ and measure the branching fraction B(B+→ρ0K* +)=(4.6±1.0±0.4)×10-6, the longitudinal polarization fL=0.78±0.12±0.03, and the CP-violation asymmetry ACP=0.31±0.13±0.03. We observe B+→f0(980)K*+ and measure the branching fraction B(B+→f0(980)K *+)×B(f0(980) →π+π-)=(4.2±0.6±0.3) ×10-6 and the CP-violation asymmetry ACP=-0. 15±0.12±0.03. The first uncertainty quoted is statistical and the second is systematic.
Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2011). Measurements of branching fractions, polarizations, and direct CP-violation asymmetries in B+→ρ0K*+ and B+→f0(980)K*+ decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 83(5) [10.1103/PhysRevD.83.051101].
Measurements of branching fractions, polarizations, and direct CP-violation asymmetries in B+→ρ0K*+ and B+→f0(980)K*+ decays
CARPINELLI, MassimoMembro del Collaboration Group
;
2011
Abstract
We present measurements of the branching fractions, longitudinal polarization, and direct CP-violation asymmetries for the decays B +→ρ0K*+ and B +→f0(980)K*+ with a sample of (467±5)×106BB̄ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the SLAC National Accelerator Laboratory. We observe B+→ρ 0K*+ with a significance of 5.3σ and measure the branching fraction B(B+→ρ0K* +)=(4.6±1.0±0.4)×10-6, the longitudinal polarization fL=0.78±0.12±0.03, and the CP-violation asymmetry ACP=0.31±0.13±0.03. We observe B+→f0(980)K*+ and measure the branching fraction B(B+→f0(980)K *+)×B(f0(980) →π+π-)=(4.2±0.6±0.3) ×10-6 and the CP-violation asymmetry ACP=-0. 15±0.12±0.03. The first uncertainty quoted is statistical and the second is systematic.
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