Study of neutral D meson - neutral anti-D meson mixing parameters using a time-dependent amplitude analysis of the decay neutral D meson going to neutral K(S) meson-pion-antipion

I present a measurement of the mixing parameters in the D meson system, using 473.5 fb-1 of data from the BABAR detector. A time-dependent fit to the Dalitz plot of the decay D0 → Kspi +pi-, assuming no CP violation, finds for the D0 -- D0 mixing parameters, the normalised mass and width differences x and y x=0.43+/-0.25+/-0.20 % y=0.70+/-0.22+/-0.17 % where the uncertainties are statistical and systematic. For D0 and D¯0 samples separately, we find xD0=0.49+/-0.36+/- 0.20% yD0=0.82+/-0.31+/- 0.17% xD&d1;0= 0.46+/-0.35+/-0.20% yD&d1;0= 0.55+/-0.31+/-0.17%.