Study of B- → DK-π+π- and B- → Dπ-π+π- decays and determination of the CKM angle γ

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. AndersonM. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, P. D'Argent, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, S. Bifani, N. Farley, P. Griffith, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, L. Pescatore, N. K. Watson, T. Williams

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Abstract

We report a study of the suppressed B→ DK-π+π- and favored B→ Dπ-π+π- decays, where the neutral D meson is detected through its decays to the Kπ± 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→ DK-π+π- and favored B→ Dπ-π+π- modes, as well as in the doubly Cabibbo suppressed D → K+π- final state of the B→ Dπ-π+π- decay. Evidence for the suppressed decay B→ DK-π+π-, with D → K+π-, is also presented. From the observed yields in the B→ DK-π+π-, B→ Dπ-π+π- and their charge conjugate decay modes, the most probable value of the weak phase γ corresponds to γ=(74+20-19)°. This is one of the most precise single-measurement determinations of γ to date.

Original languageEnglish
Article number112005
Number of pages20
JournalPhysical Review D
Volume92
Issue number11
DOIs
Publication statusPublished - 17 Dec 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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