Study of $B^{-}\to DK^-π^+π^-$ and $B^-\to Dπ^-π^+π^-$ decays and determination of the CKM angle $γ$
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Adeva, B.
name: Adinolfi, M.
name: Affolder, A.
name: Ajaltouni, Z.
name: Akar, S.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Ali, S.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amerio, S.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Anderson, J.
name: Andreotti, M.
name: Andrews, J. E.
name: Appleby, R. B.
name: Gutierrez, O. Aquines
name: Archilli, F.
name: d'Argent, P.
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Baalouch, M.
name: Bachmann, S.
name: Back, J. J.
name: Badalov, A.
name: Baesso, C.
name: Baldini, W.
name: Barlow, R. J.
name: Barschel, C.
name: Barsuk, S.
name: Barter, W.
name: Batozskaya, V.
name: Battista, V.
name: Bay, A.
name: Beaucourt, L.
name: Beddow, J.
name: Bedeschi, F.
name: Bediaga, I.
name: Bel, L. J.
name: Belyaev, I.
name: Ben-Haim, E.
name: Bencivenni, G.
name: Benson, S.
name: Benton, J.
name: Berezhnoy, A.
name: Bernet, R.
name: Bertolin, A.
name: Bettler, M. -O.
name: van Beuzekom, M.
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name: Bifani, S.
name: Bird, T.
name: Birnkraut, A.
name: Bizzeti, A.
name: Blake, T.
name: Blanc, F.
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name: Blusk, S.
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name: Bonivento, W.
name: Borghi, S.
name: Borsato, M.
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name: Britsch, M.
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name: Brodzicka, J.
name: Brook, N. H.
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name: Gomez, M. Calvo
name: Campana, P.
name: Perez, D. Campora
name: Capriotti, L.
name: Carbone, A.
name: Carboni, G.
name: Cardinale, R.
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name: Carniti, P.
name: Carson, L.
name: Akiba, K. Carvalho
name: Mohr, R. Casanova
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Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report a study of the suppressed $B^-\to DK^-π^+π^-$ and favored $B^-\to Dπ^-π^+π^-$ decays, where the neutral $D$ meson is detected through its decays to the $K^{\mp}π^{\pm}$ and CP-even $K^+K^-$ and $π^+π^-$ final states. The measurement is carried out using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 3.0~fb$^{-1}$. We observe the first significant signals in the CP-even final states of the $D$ meson for both the suppressed $B^-\to DK^-π^+π^-$ and favored $B^-\to Dπ^-π^+π^-$ modes, as well as in the doubly Cabibbo-suppressed $D\to K^+π^-$ final state of the $B^-\to Dπ^-π^+π^-$ decay. Evidence for the ADS suppressed decay $B^{-}\to DK^-π^+π^-$, with $D\to K^+π^-$, is also presented. From the observed yields in the $B^-\to DK^-π^+π^-$, $B^-\to Dπ^-π^+π^-$ and their charge conjugate decay modes, we measure the value of the weak phase to be $γ=(74^{+20}_{-19})^{\rm o}$. This is one of the most precise single-measurement determinations of $γ$ to date.
description: 22 pages, 9 figures; All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-020.html