Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha
We present improved measurements of the branching fraction B, the longitudinal polarization fraction fL, and the direct CP asymmetry ACP in the B meson decay channel B+-->ρ+ρ0. The data sample was collected with the BABAR detector at SLAC. The results are B(B+-->ρ+ρ0)=(23.7±1.4±1.4)×10-6, fL=...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/54806 https://orcid.org/0000-0002-8667-5660 |
| Summary: | We present improved measurements of the branching fraction B, the longitudinal polarization fraction fL, and the direct CP asymmetry ACP in the B meson decay channel B+-->ρ+ρ0. The data sample was collected with the BABAR detector at SLAC. The results are B(B+-->ρ+ρ0)=(23.7±1.4±1.4)×10-6, fL=0.950±0.015±0.006, and ACP=-0.054±0.055±0.010, where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the Cabibbo-Kobayashi-Maskawa phase angle α=arg(-VtdVtb*/VudVub*) to be (92.4-6.5+6.0)°. |
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