2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/97575We report a preliminary measurement of the D0-anti-D0 mixing parameter y_CP and the CP-violating parameter A_G using the decay D*+ -> D0 pi+ followed by D0 -> K- pi+ and D0 -> K+ K-. The results are obtained from a 158 fb^-1 data sample collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+ e- collider.12 pages, 6 figures (12 postscript files), submitted to Lepton Photon 2003High Energy Physics - Experimenttext