Observation of the decay B0→ρ+ρ- and measurement of the branching fraction and polarization
Abstract
We have observed the rare decay B0→ρ+ρ- 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 B(B0→ρ+ρ-)=(25+7+5-6-6)×10-6 and ΓL/Γ=0.98+0.02-0.08±0.03, respectively.
- Publication:
-
Physical Review D
- Pub Date:
- February 2004
- DOI:
- 10.1103/PhysRevD.69.031102
- arXiv:
- arXiv:hep-ex/0311017
- Bibcode:
- 2004PhRvD..69c1102A
- Keywords:
-
- 13.25.Hw;
- 11.30.Er;
- 12.15.Hh;
- Decays of bottom mesons;
- Charge conjugation parity time reversal and other discrete symmetries;
- Determination of Kobayashi-Maskawa matrix elements;
- High Energy Physics - Experiment
- E-Print:
- 8 pages, 3 postscript figues, submitted to Phys. Rev. D (Rapid Communications)