D{sub s}(2317) as a four-quark state in QCD sum rules

Journal Article · Sat Oct 01 04:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.074012· OSTI ID:20713637

Kim, Hungchong; Oh, Yongseok ^[1]

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1. 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, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 72; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
BAG MODEL
BOUND STATE
D MESONS
D S MESONS
QUANTUM CHROMODYNAMICS
QUARKS
REST MASS
SCALARS
SENSITIVITY
SUM RULES
VECTORS