• Open Access

Study of BDKπ+π and BDππ+π decays and determination of the CKM angle γ

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. D 92, 112005 – Published 17 December 2015

Abstract

We report a study of the suppressed BDKπ+π and favored BDππ+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 3.0fb1. We observe the first significant signals in the CP -even final states of the D meson for both the suppressed BDKπ+π and favored BDππ+π modes, as well as in the doubly Cabibbo suppressed DK+π final state of the BDππ+π decay. Evidence for the suppressed decay BDKπ+π, with DK+π, is also presented. From the observed yields in the BDKπ+π, BDππ+π and their charge conjugate decay modes, the most probable value of the weak phase γ corresponds to γ=(7419+20)°. This is one of the most precise single-measurement determinations of γ to date.

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  • Received 27 May 2015

DOI:https://doi.org/10.1103/PhysRevD.92.112005

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2015 CERN, for the LHCb Collaboration

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Vol. 92, Iss. 11 — 1 December 2015

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