文摘
An analysis of and decays is presented where the D meson is reconstructed in the four-body final state . Using LHCb data corresponding to an integrated luminosity of , first observations are made of the suppressed ADS modes and with a significance of 5.1¦Ò and greater than 10¦Ò, respectively. Measurements of CP asymmetries and CP-conserving ratios of partial widths from this family of decays are also performed. The magnitude of the ratio between the suppressed and favoured amplitudes is determined to be .