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Determination of the D0Kπ+π0 and D0Kπ+π+π coherence factors and average strong-phase differences using quantum-correlated measurements

N. Lowrey et al. (CLEO Collaboration)
Phys. Rev. D 80, 031105(R) – Published 26 August 2009
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Abstract

The first measurements of the coherence factors (RKππ0 and RK3π) and the average strong-phase differences (δDKππ0 and δDK3π) for D0Kπ+π0 and D0Kπ+π+π are presented. These parameters can be used to improve the determination of the unitarity triangle angle γ in BDK decays, where D is a D0 or D¯0 meson decaying to the same final state. The measurements are made using quantum-correlated, fully reconstructed D0D¯0 pairs produced in e+e collisions at the ψ(3770) resonance. The measured values are: RKππ0=0.84±0.07, δDKππ0=(22717+14)°, RK3π=0.330.23+0.20, and δDK3π=(11423+26)°. These results indicate significant coherence in the decay D0Kπ+π0, whereas lower coherence is observed in the decay D0Kπ+π+π. The analysis also results in a small improvement in the knowledge of other D-meson parameters, in particular, the strong-phase difference for D0Kπ+, δDKπ, and the mixing parameter y.

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  • Received 27 March 2009

DOI:https://doi.org/10.1103/PhysRevD.80.031105

©2009 American Physical Society

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Vol. 80, Iss. 3 — 1 August 2009

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