2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/113660We present measurements of time-dependent CP-violation asymmetries for the decays B0 to eta'K0. The data sample corresponds to 347 million BBbar pairs produced by e+e- annihilation at the Upsilon(4S) resonance in the PEP-II collider, and collected with the BaBar detector. The preliminary results are S = 0.55+/-0.11+/-0.002, and C = -0.15+/-0.07+/-0.03, where the first error quoted is statistical, the second systematic.15 pages, 4 postscript figues, submitted to ICHEP2006High Energy Physics - Experimenttext