Mixings of four-quark components in light nonsinglet scalar mesons in QCD sum rules

Journal Article · Sat Dec 01 00:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.114010· OSTI ID:21023920

Sugiyama, J; Nakamura, T; Nishikawa, T; Oka, M ^[1]; Ishii, N ^[2]

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1. Department of Physics, H-27, Tokyo Institute of Technology, Meguro, Tokyo 152-8551 (Japan)
2. Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577 (Japan)

Mixings of four-quark components in the nonsinglet scalar mesons are studied in the QCD sum rules. We propose a formulation to evaluate the cross correlators of qq and qqqq operators and to define the mixings of different Fock states in the sum rule. It is applied to the nonsinglet scalar mesons, a{sub 0} and K{sub 0}*. It is found that the four-quark operators predict lower masses than the qq operators and that the four-quark states occupy about 70%-90% of the lowest mass states.

• OSTI ID: 21023920
• Journal Information: Physical Review. D, Particles Fields, Vol. 76, Issue 11; Other Information: DOI: 10.1103/PhysRevD.76.114010; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A0-980 MESONS
FIELD OPERATORS
K*-892 MESONS
QUANTUM CHROMODYNAMICS
QUARKS
REST MASS
SUM RULES