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Observation of the decay B0 → ρ+ ρ- and measurement of the branching fraction and polarization
- Author(s): Aubert, B
- Barate, R
- Boutigny, D
- Couderc, F
- Gaillard, JM
- Hicheur, A
- Karyotakis, Y
- Lees, JP
- Tisserand, V
- Zghiche, A
- Palano, A
- Pompili, A
- Chen, JC
- Qi, ND
- Rong, G
- Wang, P
- Zhu, YS
- Eigen, G
- Ofte, I
- Stugu, B
- Abrams, GS
- Borgland, AW
- Breon, AB
- Brown, DN
- Button-Shafer, J
- Cahn, RN
- Charles, E
- Day, CT
- Gill, MS
- Gritsan, AV
- Groysman, Y
- Jacobsen, RG
- Kadel, RW
- Kadyk, J
- Kerth, LT
- Kolomensky, YG
- Kukartsev, G
- Leclerc, C
- Levi, ME
- Lynch, G
- Mir, LM
- Oddone, PJ
- Orimoto, TJ
- Pripstein, M
- Roe, NA
- Ronan, MT
- Shelkov, VG
- Telnov, AV
- Wenzel, WA
- Ford, K
- Harrison, TJ
- Hawkes, CM
- Morgan, SE
- Watson, AT
- Watson, NK
- Fritsch, M
- Goetzen, K
- Held, T
- Koch, H
- Lewandowski, B
- Pelizaeus, M
- Peters, K
- Schmuecker, H
- Steinke, M
- Boyd, JT
- Chevalier, N
- Cottingham, WN
- Kelly, MP
- Latham, TE
- Mackay, C
- Wilson, FF
- Abe, K
- Cuhadar-Donszelmann, T
- Hearty, C
- Mattison, TS
- McKenna, JA
- Thiessen, D
- Kyberd, P
- McKemey, AK
- Teodorescu, L
- Blinov, VE
- Bukin, AD
- Golubev, VB
- Ivanchenko, VN
- Kravchenko, EA
- Onuchin, AP
- Serednyakov, SI
- Skovpen, YI
- Solodov, EP
- Yushkov, AN
- Best, D
- Bruinsma, M
- Chao, M
- Eschrich, I
- Kirkby, D
- Lankford, AJ
- Mandelkern, M
- Mommsen, RK
- Roethel, W
- Stoker, DP
- et al.
Abstract
We have observed the rare decay B0 → ρ+ ρ- in a sample of 89 million BB̄ 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. © 2004 The American Physical Society.
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