Observation of the Decay B0 => rho+ rho- and Measurement of the Branching Fraction and Polarization

Details Observation of the Decay B0 => rho+ rho- and Measurement of the Branching Fraction and Polarization Observation of the Decay B0 => rho+ rho- and Measurement of the Branching Fraction and Polarization

2003-11-07

arxiv.org/abs/hep-ex/0311017v1

Phys.Rev.D69:031102,2004

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 3 postscript figues, submitted to Phys. Rev. D (Rapid Communications)

Scientific paper

10.1103/PhysRevD.69.031102

We have observed the rare decay B0 => rho+ rho- in a sample of 89 million BB pairs recorded with the BABAR detector. The number of observed events is 88 +23-21 +-9, with a significance of 5.1 standard deviations with systematic uncertainties included. The branching fraction and the longitudinal polarization are measured to be BR(B0 => rho+ rho-) = (25 +7-6 +5-6)*10^{-6} and Gamma_L/Gamma = 0.98 +0.02-0.08 +-0.03, respectively.

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