Improved measurement of B+ --> rho+ rho0 and determination of the quark-mixing phase angle alpha.

Journal article

We present improved measurements of the branching fraction B, the longitudinal polarization fraction f{L}, and the direct CP asymmetry A{CP} in the B meson decay channel B;{+}-->rho;{+}rho;{0}. The data sample was collected with the BABAR detector at SLAC. The results are B(B;{+}-->rho;{+}rho;{0})=(23.7+/-1.4+/-1.4) x 10;{-6}, f{L}=0.950+/-0.015+/-0.006, and A{CP}=-0.054+/-0.055+/-0.010, where the uncertainties are statistical and systematic, respectively. Based on these results, we per...

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Authors: Aubert, B; Karyotakis, Y; Lees, J; Poireau, V; Prencipe, E

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 102
• Issue: 14
• Pages: 141802
• Publication date: 2009-04-01
• DOI: 10.1103/physrevlett.102.141802
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: BABAR Collaboration