Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-01-22
Phys.Rev.Lett.102:141802,2009
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 1 figure, short version in Phys. Rev. Lett. (Fig.2 removed), adding color Figure 2 for the earlier versions of arxiv.
Scientific paper
10.1103/PhysRevLett.102.141802
We present improved measurements of the branching fraction ${\cal B}$, the longitudinal polarization fraction $f_L$, and the direct {\ensuremath{CP}\xspace} asymmetry {\ensuremath{{\cal A}_{CP}}\xspace} in the $B$ meson decay channel $B^+\to\rho^+\rho^0$. The data sample was collected with the {{\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}}} detector at SLAC. The results are ${\cal B} (\Bp\ra\rprz)=(23.7\pm1.4\pm1.4)\times10^{-6}$, $f_L=0.950\pm0.015\pm0.006$, and $\Acp=-0.054\pm0.055\pm0.010$, where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the CKM weak phase angle $\alpha$ to be $(92.4^{+6.0}_{-6.5})^{\circ}$.
Aubert B.
for the BABAR Collaboration
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