Observation of the suppressed ADS modes $B^± \to [π^± K^∓ π^+π^-]_D K^±$ and $B^± \to [π^± K^∓ π^+π^-]_D π^±$
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An analysis of B± → DK± and B± → Dπ± decays is presented where the D meson is reconstructed in the four-body nal state K±π∓π+π-. Using LHCb data corresponding to an integrated luminosity of 1.0 fb-1, rst observations are made of the suppressed ADS modes B± →[π±K∓π+π-] D K± and B± → [π±K∓π+π-]Dπ± with a signicance of 5.1σ and greater than 10σ, 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 B± → DK± amplitudes is determined to be rK<inf>B</inf> = 0.097±0.011. © CERN for the benet of the LHCb Collaboration.