Mixings of 4-quark components in light non-singlet scalar mesons in QCD sum rules

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Sugiyama, J.
Nakamura, T.
Ishii, N.
Nishikawa, T.
Oka, M.
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Abstract
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Mixings of 4-quark components in the non-singlet scalar mesons are studied in the QCD sum rules. We propose a formulation to evaluate the cross correlators of q\bar q and qq\bar q \bar q operators and to define the mixings of different Fock states in the sum rule. It is applied to the non-singlet scalar mesons, a_0 and K_0^\ast. It is found that the 4-quark operators predict lower masses than the q\bar q operators and that the 4-quark states occupy about 70-90% of the lowest mass states.
Comment: 8 pages, 9 figures
Keywords
High Energy Physics - Phenomenology
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