PARAMETERS ! assumed_value pos_excurs neg_excurs tb0 1.55 +0.032 -0.032 ! B0 lifetime fb0 0.5 +0.013 -0.013 ! Y(4S)->B0B0bar ! fbpb0 1.0 +0.055 -0.055 ! Y(4S)->B0B0bar/Y(4S)->B+B-