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Título:
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Quark mass dependence of light resonances and phase shifts in elastic ? ? and ? ? scattering
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Autores:
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Nebreda Manjón, Jenifer ;
Peláez Sagredo, José Ramón
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Tipo de documento:
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texto impreso
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Editorial:
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Amer Inst Physics, 2010
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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 = Sección de libro
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Resumen:
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We study the light quark mass dependence of the ? ? scattering phase shifts in standard one and two-loop SU(2) Chiral Perturbation Theory (ChPT). We then repeat the study with unitarized ChPT and; furthermore, we extend the analysis to SU(3) and generate the elastic f_0(600), ?(800) ?(770) and K*(892) resonances from unitarization. The quark masses are varied up to values of interest for lattice studies. We find that the SU(2) ? ? phase shifts both in standard and unitarized ChPT depend very softly on the pion mass and that our results are in fair agreement with lattice results in the I=2, J=0 channel. In the SU(3) amplitudes, the mass and width of the ? (770) and K*(892) present an analogous and smooth quark mass dependence. In contrast, both scalars present a similar non-analyticity at high quark masses. We also confirm the lattice assumption of independence of the vector two-meson coupling on the quark mass, that is, nevertheless, violated for scalars.
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En línea:
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https://eprints.ucm.es/id/eprint/35154/1/pelaezsagredo30libre.pdf
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