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Título:
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Pion-pion scattering amplitude. II. Improved analysis above K?K threshold
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Autores:
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Kami?ski, R ;
Peláez Sagredo, José Ramón ;
Ynduráin, F. J.
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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, 2006-07
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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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We improve, in the energy region between the K?K threshold and ~ 1.4 GeV, the energy-dependent phase shift analysis of ? ? scattering presented in a previous paper. For the S0 wave, we have included more data above the K?K threshold and we have taken into account systematically the elasticity data on the reaction ? ? ?K?K. We here made a coupled channel fit. For the D0 wave, we have considered information on low energy parameters, and imposed a better fit to the f_2 resonance. For both waves the expressions we now find are substantially more precise than the previous ones. We also provide slightly improved D2 and P waves, including the estimated inelasticity for the first, and a more flexible parametrization between 1 and 1.42 GeV for the second. The accuracy of our amplitudes is now such that it requires a refinement of the Regge analysis, for^(1/2) ? 1.42 GeV, which we also carry out. We show that this more realistic input produces ? ? scattering amplitudes that satisfy better forward dispersion relations, particularly for ?^0 ?^0 scattering.
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En línea:
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https://eprints.ucm.es/35370/1/pelaezsagredo56libre.pdf
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