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Contribution of DK Continuum in the QCD Sum Rule for D_(sJ)(2317)

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arxiv hep-ph/0610327 v4 pith:ZBAYECWV submitted 2006-10-25 hep-ph hep-ex

Contribution of DK Continuum in the QCD Sum Rule for D_(sJ)(2317)

classification hep-ph hep-ex
keywords contributionmassconstantcontinuumcurrentdecayloweragreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Using the soft-pion theorem and the assumption on the final-state interactions, we include the contribution of $DK$ continuum into the QCD sum rules for $D_{sJ}(2317)$ meson. We find that this contribution can significantly lower the mass and the decay constant of $D_s(0^+)$ state. For the value of the current quark mass $m_c(m_c)=1.286 {\rm GeV}$, we obtain the mass of $D_s(0^+)$ $M=2.33 \pm 0.02 {\rm GeV}$ in the interval $s_0=7.5-8.0 {\rm GeV}^2$, being in agreement with the experimental data, and the vector current decay constant of $D_s(0^+)$ $f_0=0.128 \pm 0.013 {\rm GeV}$, much lower than those obtained in previous literature.

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  1. A Paradigm for the Coupled-Channel Origin of Resonances: the Exotic $T_{c\bar{s}}$ in $D_{s1}(2460/2536)\to D_s\pi\pi$

    hep-ph 2025-10 conditional novelty 6.0

    An off-diagonal DK–D_sπ coupled-channel interaction generates the T_cbar{s} pole on the second Riemann sheet, and predicts a single-peak D_s1(2536) decay.