Time-Dependent CP Asymmetries in b --> s qbar q Transitions and sin2phi1 in B0 --> J/psi K0 Decays with 386 Million BBbar Pairs

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dc.creatorThe Belle Collaboration
dc.creatorAbe, K.
dc.date2005-07-08
dc.date.accessioned2026-07-07T03:37:00Z
dc.date.available2026-07-07T03:37:00Z
dc.descriptionWe present measurements of time-dependent CP asymmetries in B0 --> phi(1020) K0, eta' K0, Ks Ks Ks, Ks pi0, f0(980) Ks, omega Ks and K+ K- Ks decays based on a sample of 386 x 10^6 BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. These decays are dominated by the b --> s gluonic penguin transition and are sensitive to new CP-violating phases from physics beyond the standard model. One neutral B meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying B meson is identified from its decay products. CP-violation parameters sin2phi1^eff and {\cal A} for each of the decay modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays. We also perform an improved measurement of CP asymmetries in B0 --> J/psi K0 decays using the same data sample. The same analysis procedure mentioned above yields sin2phi1 = +0.652 +/- 0.039(stat) +/- 0.020(syst), which serves as a reference point for the standard model, and {\cal A} = +0.010 +/- 0.026(stat) +/- 0.036(syst).
dc.description36 pages, 17 figures, contributed to the XXII International Symposium on Lepton-Photon Interactions at High Energy (Lepton-Photon 2005), June 30 - July 5, 2005, Uppsala, Sweden
dc.identifierhttps://arxiv.org/abs/hep-ex/0507037
dc.identifierhttp://arxiv.org/abs/hep-ex/0507037
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/37944
dc.subjectHigh Energy Physics - Experiment
dc.titleTime-Dependent CP Asymmetries in b --> s qbar q Transitions and sin2phi1 in B0 --> J/psi K0 Decays with 386 Million BBbar Pairs
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