Measurement of the D -> K-pi(+)pi(+)pi(-) and D -> K-pi(+)pi(0) coherence factors and average strong-phase differences in quantum-correlated D(D)over-bar decays
JOURNAL OF HIGH ENERGY PHYSICS Springer Science and Business Media LLC 2021:5 (2021) ARTN 164
Abstract:
The decays D → K π π π and D → K π π are studied in a sample of quantum-correlated DD¯ pairs produced through the process e e → ψ(3770) → DD¯ , exploiting a data set collected by the BESIII experiment that corresponds to an integrated luminosity of 2.93 fb . Here D indicates a quantum superposition of a D and a D¯ meson. By reconstructing one neutral charm meson in a signal decay, and the other in the same or a different final state, observables are measured that contain information on the coherence factors and average strong-phase differences of each of the signal modes. These parameters are critical inputs in the measurement of the angle γ of the Unitarity Triangle in B → DK decays at the LHCb and Belle II experiments. The coherence factors are determined to be R = 0.52−0.10+0.12 and RKππ0 = 0.78 ± 0.04, with values for the average strong-phase differences that are δDK3π=(167−19+31)° and δDKππ0=(196−15+14)°, where the uncertainties include both statistical and systematic contributions. The analysis is re-performed in four bins of the phase-space of the D → K π π π to yield results that will allow for a more sensitive measurement of γ with this mode, to which the BESIII inputs will contribute an uncertainty of around 6°. [Figure not available: see fulltext.] − + + − − + 0 + − −1 0 − − − + + − K3πAmplitude analysis and branching-fraction measurement of Ds+→KS0K-π+π+
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