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Contribution of the DK continuum in the QCD sum rule for DsJ(2317)

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Abstract

Using the soft-pion theorem and the assumption on the final-state interactions, we include the contribution of the DK continuum into the QCD sum rules for the DsJ(2317) meson. We find that this contribution can significantly lower the mass and the decay constant of the Ds(0+) state. For the value of the current quark mass mc(mc) = 1.286 GeV, we obtain the mass of Ds(0+) M=2.33 ± 0.02 GeV in the interval s0 = 7.5–8.0 GeV2, being in agreement with the experimental data, and the vector current decay constant of Ds(0+) f0=0.128 ± 0.013 GeV, much lower than those obtained in the previous literature.

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Authors and Affiliations

  1. Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing, 100080, P.R. China

    Yuan-Ben Dai & Xin-Qiang Li

  2. Department of Physics, Peking University, Beijing, 100871, P.R. China

    Shi-Lin Zhu

  3. Department of Physics, Graduate School of Chinese Academy of Sciences, Beijing, P.R. China

    Ya-Bing Zuo

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  1. Yuan-Ben Dai
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  2. Xin-Qiang Li
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  3. Shi-Lin Zhu
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  4. Ya-Bing Zuo
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Correspondence to Shi-Lin Zhu.

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PACS

12.39.Hg; 13.25.Hw; 13.25.Ft; 12.38.Lg

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Dai, YB., Li, XQ., Zhu, SL. et al. Contribution of the DK continuum in the QCD sum rule for DsJ(2317). Eur. Phys. J. C 55, 249–258 (2008). https://doi.org/10.1140/epjc/s10052-008-0591-9

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  • DOI: https://doi.org/10.1140/epjc/s10052-008-0591-9

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