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Evidence for CP Violation in B0→J/ψπ0 Decays Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration Física de partícules Experiments Particle physics Experiments We present measurements of the branching fraction and time-dependent C P asymmetries in B 0 → J / ψ π 0 decays based on 466 × 10 6 Υ ( 4 S ) → B ¯¯¯ B events collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We measure the C P asymmetry parameters S = − 1.23 ± 0.21 ( stat ) ± 0.04 ( syst ) and C = − 0.20 ± 0.19 ( stat ) ± 0.03 ( syst ) , where the measured value of ( S , C ) is 4.0 standard deviations from (0, 0) including systematic uncertainties. The branching fraction is determined to be B ( B 0 → J / ψ π 0 ) = [ 1.69 ± 0.14 ( stat ) ± 0.07 ( syst ) ] × 10 − 5 . 2019-09-05T14:53:57Z 2019-09-05T14:53:57Z 2008-07-10 2019-09-05T14:53:57Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0031-9007 https://hdl.handle.net/2445/139351 577684 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.101.021801 Physical Review Letters, 2008, vol. 101, num. 2, p. 021801 https://doi.org/10.1103/PhysRevLett.101.021801 (c) American Physical Society, 2008 info:eu-repo/semantics/openAccess 7 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)