### First observation of the suppressed ADS modes $B^\pm \to [\pi^\pm K^\mp \pi^+\pi^-]_D K^\pm$ and $B^\pm \to [\pi^\pm K^\mp \pi^+\pi^-]_D \pi^\pm$First observation of the suppressed ADS modes $B^\pm \to [\pi^\pm K^\mp \pi^+\pi^-]_D K^\pm$ and $B^\pm \to [\pi^\pm K^\mp \pi^+\pi^-]_D \pi^\pm$

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 Source CERN Document Server File Format ZIP Date Created 2012-09-17 Language English
 Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Modern physics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics Subject Keyword Flavour physics ♦ B physics ♦ Particle Physics - Experiment ♦ CKM angle gamma ♦ CP violation Abstract 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 $K^{\pm}\pi^{\mp} \pi^+ \pi^-$. Exploiting $1.0{\rm \,fb}^{-1}$ of LHCb data, we observe for the first time 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 $>10\sigma$, respectively. Measurements of several observables, including $CP$ asymmetries, are also performed. Description Presented at: 7th International Workshop on the CKM Unitarity Triangle, Cincinnati, Ohio, United States Of America, 28 Sep - 2 Oct 2012Collaboration with: LHCb Learning Resource Type Notes Rights License Preprint: (License: CC-BY-4.0) Organization The LHCb Collaboration