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Title: An AdS/QCD model from tachyon condensation: II
Author: Iatrakis, Ioannis
Kiritsis, Elias
Paredes, Ángel
Keywords: Cromodinàmica quàntica
Simetria trencada (Física)
Quantum chromodynamics
Broken symmetry (Physics)
Issue Date: 2010
Publisher: Springer; Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Abstract: A simple holographic model is presented and analyzed that describes chiral symmetry breaking and the physics of the meson sector in QCD. This is a bottom-up model that incorporates string theory ingredients like tachyon condensation which is expected to be the main manifestation of chiral symmetry breaking in the holographic context. As a model for glue the Kuperstein-Sonnenschein background is used. The structure of the flavor vacuum is analyzed in the quenched approximation. Chiral symmetry breaking is shown at zero temperature. Above the deconfinement transition chiral symmetry is restored. A complete holographic renormalization is performed and the chiral condensate is calculated for different quark masses both at zero and non-zero temperatures. The 0++, 0¿+, 1++, 1¿¿ meson trajectories are analyzed and their masses and decay constants are computed. The asymptotic trajectories are linear. The model has one phenomenological parameter beyond those of QCD that affects the 1++, 0¿+ sectors. Fitting this parameter we obtain very good agreement with data. The model improves in several ways the popular hard-wall and soft wall bottom-up models.
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It is part of: Journal of High Energy Physics, 2010, vol. 11, núm. 123
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ISSN: 1029-8479
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Publicacions de projectes de recerca finançats per la UE

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