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Time-dependent analysis and amplitude analysis of B0 ! K0s K0s K0s decays with the BABAR experiment

Abstract : Two independent analyses of the decay channel B0 ! K0s K0s K0s have been performed on a data sample of 468 millions of B¯B pairs recorded by the BABAR detector at the PEP-II B factory at SLAC National Laboratory. The first analysis is a phase-space-integrated time-dependent analysis to extract the CP violation parameters S and C from the two sub-modes B0 ! 3K0s (¼+¼−) and B0 ! 2K0s (¼+¼−)K0s (¼0¼0) simultaneously and to compare them to the charmonium measurements. The result is • S = −0.94+0.24 −0.21 ± 0.06 • C = −0.17+0.18 −0.18 ± 0.04 , where the first uncertainty is statistical and the second is systematical. The result is compatible within uncertainties with the Standard Model prediction and the charmonium modes measurements. The second analysis is a time-integrated amplitude (or Dalitz plot) analysis to extract the inclusive branching fraction and the branching fractions of the resonant modes that contribute to the decay. The result of the first amplitude analysis of this decay channel is • B(B0 ! K0s K0s K0s ) = (6.18 ± 0.47 ± 0.14 ± 0.06) × 10−6 • B(B0 ! f0(980)K0s ; f0(980) ! K0s K0s ) = (2.69+1.25 −1.18 ± 0.35 ± 1.87) × 10−6 • B(B0 ! f0(1710)K0s ; f0(1710) ! K0s K0s ) = (0.50+0.46 −0.23 ± 0.04 ± 0.12) × 10−6 • B(B0 ! f2(2010)K0s ; f2(2010) ! K0s K0s ) = (0.54+0.21 −0.20 ± 0.03 ± 0.44) × 10−6 • B(B0 ! Nonresonant; K0s K0s K0s ) = (13.31+2.23 −2.30 ± 0.55 ± 2.77) × 10−6 • B(B0 ! Âc0K0s ; Âc0 ! K0s K0s ) = (0.46+0.25 −0.16 ± 0.01 ± 0.19) × 10−6 , where the first uncertainty is statististal, the second is systematical and the third corresponds to Dalitz plot model uncertainties. No significant contribution of the controversial fX(1500) resonance has been found. dumm
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Submitted on : Monday, January 24, 2011 - 10:38:33 AM
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Simon Sitt. Time-dependent analysis and amplitude analysis of B0 ! K0s K0s K0s decays with the BABAR experiment. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨tel-00558768⟩

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