We search for the decays B0->rho0rho0, B0->rho0f0, and B0->f0f0 in a sample of about 384 million Upsilon(4S)->BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We find evidence for B0->rho0rho0 with 3.5 sigma significance and measure the branching fraction BR = (1.07+-0.33+-0.19)10^-6 and longitudinal polarization fraction f_L = 0.87+-0.13+-0.04, where the first uncertainty is statistical, and the second is systematic. The uncertainty on the CKM unitarity angle alpha due to penguin contributions in B-> rho rho decays is 18 degrees at the 1 sigma level. We also set upper limits on the B0->rho0f0 and B0->f0f0 decay rates.

Evidence for B0 -> rho0 rho0 decays and implications for the Cabibbo-Kobayashi-Maskawa angle alpha / B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J.P. Lees, V. Poireau, X. Prudent, V. Tisserand, A. Zghiche, E. Grauges, A. Palano, J.C. Chen, N.D. Qi, G. Rong, P. Wang, Y.S. Zhu, G. Eigen, I. Ofte, B. Stugu, G.S. Abrams, M. Battaglia, D.N. Brown, J. Button-Shafer, R.N. Cahn, Y. Groysman, R. G. Jacobsen, J.A. Kadyk, L.T. Kerth, Yu. G. Kolomensky, G. Kukartsev, D. Lopes Pegna, G. Lynch, L.M. Mir, T.J. Orimoto, I. Osipenkov, M. Pripstein, N.A. Roe, M.T. Ronan,, K. Tackmann, W.A. Wenzel, P. del Amo Sanchez, M. Barrett, T.J. Harrison, A.J. Hart, C.M. Hawkes, A.T. Watson, T. Held, H. Koch, B. Lewandowski, M. Pelizaeus, K. Peters, T. Schroeder, M. Steinke, J.T. Boyd, J. P. Burke, W.N. Cottingham, D. Walker, D.J. Asgeirsson, T. Cuhadar-Donszelmann, B.G. Fulsom, C. Hearty, N.S. Knecht, T S. Mattison, J.A. McKenna, A. Khan, P. Kyberd, M. Saleem, D.J. Sherwood, L. Teodorescu, V.E. Blinov, A.D. 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Evidence for B0 -> rho0 rho0 decays and implications for the Cabibbo-Kobayashi-Maskawa angle alpha

S.H. Robertson;A. Lazzaro;V.P. Lombardo;M. Morganti;
2007

Abstract

We search for the decays B0->rho0rho0, B0->rho0f0, and B0->f0f0 in a sample of about 384 million Upsilon(4S)->BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We find evidence for B0->rho0rho0 with 3.5 sigma significance and measure the branching fraction BR = (1.07+-0.33+-0.19)10^-6 and longitudinal polarization fraction f_L = 0.87+-0.13+-0.04, where the first uncertainty is statistical, and the second is systematic. The uncertainty on the CKM unitarity angle alpha due to penguin contributions in B-> rho rho decays is 18 degrees at the 1 sigma level. We also set upper limits on the B0->rho0f0 and B0->f0f0 decay rates.
B rare decays ; Decays of bottom mesons ; Charge conjugation, parity ; time reversal, and other discrete symmetries ; Determination of Kobayashi-Maskawa matrix elements
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/39550
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