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Título:
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Nonfactorization of four-quark condensates at low energies within chiral perturbation theory
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Autores:
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Gómez Nicola, Ángel ;
Peláez Sagredo, José Ramón ;
Ruiz de Elvira, Jacobo
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Tipo de documento:
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texto impreso
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Editorial:
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Amer Physical Soc, 2010-10-14
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física-Modelos matemáticos
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Materia = Ciencias: Física: Física matemática
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Tipo = Artículo
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Resumen:
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Four-quark correlators and the factorization hypothesis are analyzed in the meson sector within chiral perturbation theory. We define the four-quark condensate as lim(x -> 0) , which is equivalent to other definitions commonly used in the literature. Factorization of the four-quark condensate holds to leading and next to leading order. However, at next to next to leading order, a term with a nontrivial space-time dependence in the four-quark correlator yields a divergent four-quark condensate, whereas the two-quark condensate and the scalar susceptibility are finite. Such a nonfactorization term vanishes only in the chiral limit. We also comment on how factorization still holds in the large N-c limit, provided such a limit is taken before renormalization.
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En línea:
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https://eprints.ucm.es/id/eprint/30222/1/gnicola08libre.pdf
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