@article{ae6f5afacad84756bdaaa4bef41fa312,
title = "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 B{\=B} pairs recorded with the BABAR detector. The number of observed events is 88-21 +23±9 with a significance of 5.1 standard deviations with systematic uncertainties included. The branching fraction and the longitudinal polarization are measured to be β(B0 → ρ+ ρ-) = (25-6-6 +7+5× 10-6 and ΓLΓ = 0.98-0.08 +0.02±0. 03, respectively.",
author = "{BABAR Collaboration} and B. Aubert and R. Barate and D. Boutigny and F. Couderc and Gaillard, {J. M.} and A. Hicheur and Y. Karyotakis and Lees, {J. P.} and V. Tisserand and A. Zghiche and A. Palano and A. Pompili and Chen, {J. C.} and Qi, {N. D.} and G. Rong and P. Wang and Zhu, {Y. S.} and G. Eigen and I. Ofte and B. Stugu and Abrams, {G. S.} and Borgland, {A. W.} and Breon, {A. B.} and Brown, {D. N.} and J. Button-Shafer and Cahn, {R. N.} and E. Charles and Day, {C. T.} and Gill, {M. S.} and Gritsan, {A. V.} and Y. Groysman and Jacobsen, {R. G.} and Kadel, {R. W.} and J. Kadyk and Kerth, {L. T.} and Kolomensky, {Yu G.} and G. Kukartsev and C. Leclerc and Levi, {M. E.} and G. Lynch and Mir, {L. M.} and Oddone, {P. J.} and Orimoto, {T. J.} and M. Pripstein and Roe, {N. A.} and Ronan, {M. T.} and Shelkov, {V. G.} and Lange, {D. J.} and P. Elmer and J. Olsen",
year = "2004",
doi = "10.1103/PhysRevD.69.031102",
language = "English (US)",
volume = "69",
journal = "Physical Review D",
issn = "0556-2821",
publisher = "American Physical Society",
number = "3",
}