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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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