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Study of the decay B0(B- 0)-->rho+rho-, and constraints on the Cabibbo-Kobayashi-Maskawa angle alpha |
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| Authors: | Aubert B Barate R Boutigny D Couderc F Gaillard J-M Hicheur A Karyotakis Y Lees J P Tisserand V Zghiche A Palano A Pompili A Chen J C Qi N D Rong G Wang P Zhu Y S Eigen G Ofte I Stugu B Abrams G S Borgland A W Breon A B Brown D N Button-Shafer J Cahn R N Charles E Day C T Gill M S Gritsan A V Groysman Y Jacobsen R G Kadel R W Kadyk J Kerth L T Kolomensky Yu G Kukartsev G LeClerc C Lynch G Merchant A M Mir L M Oddone P J Orimoto T J Pripstein M Roe N A Ronan M T Shelkov V G Wenzel W A Ford K Harrison T J Hawkes C M Morgan S E Watson A T Fritsch M Goetzen K Held T Koch H Lewandowski B |
| Institution: | Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France. |
| Abstract: | Using a data sample of 89 x 10(6) Upsilon(4S)-->BB decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC, we measure the B0(B (0))-->rho(+)rho(-) branching fraction as 30+/-4(stat)+/-5(syst)]x10(-6) and a longitudinal polarization fraction of f(L)=0.99+/-0.03(stat)+0.04-0.03(syst). We measure the time-dependent-asymmetry parameters of the longitudinally polarized component of this decay as C(L)=-0.17+/-0.27(stat)+/-0.14(syst) and S(L)=-0.42+/-0.42(stat)+/-0.14(syst). We exclude values of alpha between 19 degrees and 71 degrees (90% C.L.). |
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