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Aaij, R.; Amhis, Y.; Barsuk, S.; Callot, O.; He, J.; Kochebina, O.; Lefrançois, J.; Machefert, F.; Martin Sanchez, A.; Nicol, M.; Robbe, P.; Schune, M.-H.; Teklishyn, M.; Viaud, B.; Ben-Haim, E.; Benayoun, M.; David, P.; del Buono, L.; Martens, A.; Polci, F.; Ajaltouni, Ziad Zj; Cogneras, E.; Deschamps, O.; El Rifai, I.; Grabalosa Gándara, M.; Henrard, Pierre; Hoballah, M.; Lefèvre, R.; Li Gioi, L.; Monteil, S.; Niess, V.; Perret, Pascal; Roa Romero, Diego Alejandro; de Bonis, I.; Decamp, D.; Ghez, Ph; Hopchev, P.; Lees, J.-P.; Machikhiliyan, I.V.; Minard, M.-N.; Pietrzyk, B.; Qian, W.; t'Jampens, S.; Tisserand, V.; Tournefier, E.; Adrover, C.; Aslanides, E.; Cogan, J.; Legac, R.; Leroy, O.; Mancinelli, G.; Maurice, E.; Perrin-Terrin, M.; Sapunov, M.; Serrano, J.; Tsaregorodtsev, A.
Physics letters. B, 03/2013, Letnik: 723Journal Article
An analysis of $B^{\pm}\to DK^{\pm}$ and $B^{\pm}\to D\pi^{\pm}$ decays is presented where the $D$ meson is reconstructed in the four-body final state $K^{\pm}\pi^{\mp} \pi^+ \pi^-$. Using LHCb data corresponding to an integrated luminosity of $1.0{\rm \,fb}^{-1}$, first observations are made of the suppressed ADS modes $B^{\pm}\to \pi^{\pm} K^{\mp}\pi^+\pi^-_D K^{\pm}$ and $B^{\pm}\to \pi^{\pm} K^{\mp} \pi^+\pi^- _D\pi^{\pm}$ with a significance of $5.1\sigma$ and greater than $10\sigma$, 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 $B^{\pm}\to DK^{\pm}$ amplitudes is determined to be $r^K_B = 0.097 \pm{0.011}$.
