D_s (2317) as a four-quark state in QCD sum rules

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dc.creatorKim, Hungchong
dc.creatorOh, Yongseok
dc.date2005-08-24
dc.date2005-09-26
dc.date.accessioned2026-07-07T10:29:39Z
dc.date.available2026-07-07T10:29:39Z
dc.descriptionWe perform a QCD sum rule study of the open-charmed $D_s (2317)$ as a four-quark state. Using the diquark-antidiquark picture for the four-quark state, we consider four possible interpolating fields for $D_s (2317)$, namely, scalar-scalar, pseudoscalar-pseudoscalar, vector-vector, and axial-vector--axial-vector types. We test all four currents by constructing four separate sum rules. The sum rule with the scalar-scalar current gives a stable value for the $D_s$ mass which qualitatively agrees with the experimental value, and the result is not sensitive to the continuum threshold. The vector-vector sum rule also gives a stable result with small sensitivity to the continuum threshold and the extracted mass is somewhat lower than the scalar-scalar current value. On the other hand, the two sum rules in the pseudoscalar and axial-vector channels are found to yield the mass highly sensitive to the continuum threshold, which implies that a four-quark state with the combination of pseudoscalar-pseudoscalar or axial-vector--axial-vector type would be disfavored. These results would indicate that $D_s (2317)$ is a bound state of scalar-diquark and scalar-antidiquark and/or vector-diquark and vector-antidiquark.
dc.description10 pages, 4 figures, REVTeX, 1 fig. added. to appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-ph/0508251
dc.identifierhttp://arxiv.org/abs/hep-ph/0508251
dc.identifierPhys.Rev.D72:074012,2005
dc.identifierdoi:10.1103/PhysRevD.72.074012
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177877
dc.subjectHigh Energy Physics - Phenomenology
dc.titleD_s (2317) as a four-quark state in QCD sum rules
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