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Publication - Professor Jonas Rademacker

    Model-independent determination of the strong phase difference between D 0 and D¯ 0→ π+ππ+π amplitudes

    Citation

    Harnew, S, Naik, P, Prouve, C, Rademacker, J & Asner, D, 2018, ‘Model-independent determination of the strong phase difference between D 0 and D¯ 0→ π+ππ+π amplitudes’. Journal of High Energy Physics, vol 2018.

    Abstract

    For the first time, the strong phase difference between D0 and D¯ 0→ π+ππ+π amplitudes is determined in bins of the decay phase space. The measurement uses 818 pb−1 of e+e collision data that is taken at the ψ(3770) resonance and collected by the CLEO-c experiment. The measurement is important for the determination of the CP -violating phase γ in B± → DK± (and similar) decays, where the D meson (which represents a superposition of D0 and D¯ 0) subsequently decays to π+ππ+π. To obtain optimal sensitivity to γ, the phase space of the D → π+ππ+π decay is divided into bins based on a recent amplitude model of the decay. Although an amplitude model is used to define the bins, the measurements obtained are model-independent. The CP -even fraction of the D → π+ππ+π decay is determined to be F+ = 0.769 ± 0.021 ± 0.010, where the uncertainties are statistical and systematic, respectively. Using simulated B± → DK±, D → π+ππ+π decays, it is estimated that by the end of the current LHC run, the LHCb experiment could determine γ from this decay mode with an uncertainty of (±10 ± 7)°, where the first uncertainty is statistical based on estimated LHCb event yields, and the second is due to the uncertainties on the parameters determined in this paper.

    Full details in the University publications repository