D{sub s}(2317) as a four-quark state in QCD sum rules
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of)
We perform a QCD sum-rule study of the open-charmed D{sub 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{sub 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{sub 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{sub s}(2317) is a bound state of scalar-diquark and scalar-antidiquark and/or vector-diquark and vector-antidiquark.
- OSTI ID:
- 20713637
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 72, Issue 7; Other Information: DOI: 10.1103/PhysRevD.72.074012; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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