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arxiv: 1203.3804 · v3 · pith:V5PTNRV2new · submitted 2012-03-16 · ✦ hep-ex

Studies of the decays D⁰ rightarrow K_S⁰K^-π^+ and D⁰ rightarrow K_S⁰K^+π^-

CLEO Collaboration: J. Insler , H. Muramatsu , C. S. Park , L. J. Pearson , E. H. Thorndike , S. Ricciardi , C. Thomas , M. Artuso
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S. Blusk R. Mountain T. Skwarnicki S. Stone J. C. Wang L. M. Zhang G. Bonvicini D. Cinabro M. J. Smith P. Zhou T. Gershon P. Naik J. Rademacker K. W. Edwards K. Randrianarivony R. A. Briere H. Vogel P. U. E. Onyisi J. L. Rosner J. P. Alexander D. G. Cassel S. Das R. Ehrlich L. Gibbons S. W. Gray D. L. Hartill D. L. Kreinick V. E. Kuznetsov J. R. Patterson D. Peterson D. Riley A. Ryd A. J. Sadoff X. Shi W. M. Sun J. Yelton P. Rubin N. Lowrey S. Mehrabyan M. Selen J. Wiss J. Libby M. Kornicer R. E. Mitchell D. Besson T. K. Pedlar D. Cronin-Hennessy J. Hietala S. Dobbs Z. Metreveli K. K. Seth A. Tomaradze T. Xiao D. Johnson S. Malde L. Martin A. Powell G. Wilkinson D. M. Asner G. Tatishvili J. Y. Ge D. H. Miller I. P. J. Shipsey B. Xin G. S. Adams J. Napolitano K. M. Ecklund
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classification ✦ hep-ex
keywords rightarrowdecayscoherencedeltameasurementscircdifferencefactor
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The first measurements of the coherence factor R_{K_S^0K\pi} and the average strong--phase difference \delta^{K_S^0K\pi} in D^0 \to K_S^0 K^\mp\pi^\pm decays are reported. These parameters can be used to improve the determination of the unitary triangle angle \gamma\ in B^- \rightarrow $\widetilde{D}K^-$ decays, where $\widetilde{D}$ is either a D^0 or a D^0-bar meson decaying to the same final state, and also in studies of charm mixing. The measurements of the coherence factor and strong-phase difference are made using quantum-correlated, fully-reconstructed D^0D^0-bar pairs produced in e^+e^- collisions at the \psi(3770) resonance. The measured values are R_{K_S^0K\pi} = 0.70 \pm 0.08 and \delta^{K_S^0K\pi} = (0.1 \pm 15.7)$^\circ$ for an unrestricted kinematic region and R_{K*K} = 0.94 \pm 0.12 and \delta^{K*K} = (-16.6 \pm 18.4)$^\circ$ for a region where the combined K_S^0 \pi^\pm invariant mass is within 100 MeV/c^2 of the K^{*}(892)^\pm mass. These results indicate a significant level of coherence in the decay. In addition, isobar models are presented for the two decays, which show the dominance of the K^*(892)^\pm resonance. The branching ratio {B}(D^0 \rightarrow K_S^0K^+\pi^-)/{B}(D^0 \rightarrow K_S^0K^-\pi^+) is determined to be 0.592 \pm 0.044 (stat.) \pm 0.018 (syst.), which is more precise than previous measurements.

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