Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-07-09
Physics
High Energy Physics
High Energy Physics - Experiment
14 pages, 5 figures, submitted to the Lepton-Photon 2005 Conference (Uppsala, Sweden) and the HEP2005 Europhysics Conference (
Scientific paper
We have measured the branching fraction, longitudinal polarization fraction f_L, and the CP asymmetry coefficients A and S in B0 -> rho+rho- decays. These results are obtained from a 253 fb-1 data sample containing 275 million B\bar{B} pairs collected by the Belle detector running at the KEKB e+e- collider. We obtain B = [24.4 \pm 2.2 (stat) +3.8 -4.1 (syst)] x 10-6, f_L = 0.951 +0.033 -0.039 (stat) +0.029 -0.031 (syst), A = 0.00 \pm 0.30 (stat) +0.10 -0.09 (syst), and S = 0.09 \pm 0.42 (stat) \pm 0.08 (syst). These values are used to determine the CKM phase angle phi_2 (alpha) via an isospin analysis; the central value and one sigma error are (87 \pm 17) degrees, and 59 degrees < phi_2 < 115 degrees at 90% CL.
Abe Kanshi
for the Belle Collaboration
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