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Exotic quark structure of (1405) and scalar nonet in QCD sum rule

✍ Scribed by T. Nakamura; J. Sugiyama; N. Ishii; T. Nishikawa; M. Oka

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 157 KB
Volume: 40
Category: Article
ISSN: 1386-9477
DOI: 10.1016/j.physe.2007.06.043

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✦ Synopsis

Mixing of multi-quark components in the non-singlet scalar mesons and the flavor singlet L(1405) baryon with negative parity are studied in the QCD sum rule. We propose a formulation to evaluate cross-correlators of qq(qqq) and qqqq ðqqqqqÞ operators and to define mixing of different Fock states in the sum rule. It is applied to the non-singlet scalar mesons and L(1405) baryon. We find that the multi-quark operators predict lower masses than the qq(qqq) operators and that the multi-quark states are dominant in the lowest mass states.

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