We present a measurement of CP-violating asymmetries in fully reconstructed B0→D(*)±π∓ decays in approximately 88×10^6 Υ(4S)→BB̅ decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a time-dependent maximum-likelihood fit we obtain the following for the CP-violating parameters: a=-0.022±0.038 (stat)±0.020 (syst), a*=-0.068±0.038 (stat)±0.020 (syst), clep=+0.025±0.068 (stat)±0.033 (syst), and clep*=+0.031±0.070 (stat)±0.033 (syst). Using other measurements and theoretical assumptions we interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle, and find |sin(2β+γ)|>0.69 at 68% confidence level. We exclude the hypothesis of no CP violation [sin(2β+γ)=0] at 83% confidence level.
Measurement of Time-Dependent CP Asymmetries in B0→D(*)±π∓ Decays and Constraints on sin(2β+γ)
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;SIMI, GABRIELE;
2004
Abstract
We present a measurement of CP-violating asymmetries in fully reconstructed B0→D(*)±π∓ decays in approximately 88×10^6 Υ(4S)→BB̅ decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a time-dependent maximum-likelihood fit we obtain the following for the CP-violating parameters: a=-0.022±0.038 (stat)±0.020 (syst), a*=-0.068±0.038 (stat)±0.020 (syst), clep=+0.025±0.068 (stat)±0.033 (syst), and clep*=+0.031±0.070 (stat)±0.033 (syst). Using other measurements and theoretical assumptions we interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle, and find |sin(2β+γ)|>0.69 at 68% confidence level. We exclude the hypothesis of no CP violation [sin(2β+γ)=0] at 83% confidence level.Pubblicazioni consigliate
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