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Measurement of Time-Dependent CP-Violating Parameters in B0 -> K0S K0S decays

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arxiv 0712.4234 v1 pith:3FTXZYHL submitted 2007-12-27 hep-ex

Belle Collaboration: Y. Nakahama , K. Sumisawa , et al This is my paper · ORCID
classification hep-ex
keywords cp-violatingdecaysparametersdecaymeasurementmesonstatsyst
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We report a measurement of the CP-violating parameters in B0->K0S K0S decays based on a data sample of 657 million BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. In this study, one neutral B meson is fully reconstructed in the B0->K0S K0S decay mode, and the flavor of the accompanying B meson is identified by its decay products. The CP-violating parameters are measured from the asymmetry in the distributions of the proper-time interval between the two B decays: S = -0.38 +0.69-0.77(stat) +-0.09(syst) and A = -0.38 +-0.38(stat) +-0.05(syst).

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  1. Method to study $CP$ violation in $B_s^0\to K_S K^\pm \pi^\mp$ decays

    hep-ph 2026-06 unverdicted novelty 7.0 of 10

    A method is developed to relate amplitudes for B_s^0 → K_S K* resonances in the two final states, enabling the first tagged decay-time-dependent Dalitz analysis to measure the effective weak phase φ_s^eff.

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