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Title: Light scalar mesons in the soft-wall model of AdS/QCD

Abstract

We study light scalar mesons in the holographic QCD soft-wall model with a background dilaton field. The masses and decay constants are compatible with experiment and QCD determinations if a{sub 0}(980) and f{sub 0}(980) are identified as the lightest scalar mesons; moreover, the states are organized in linear Regge trajectories with the same slope of vector mesons. Comparing the two-point correlation function of scalar operators derived on the anti-de Sitter side and in QCD, information about the condensates can be derived. Strong couplings of scalar states to pairs of light pseudoscalar mesons turn out to be small, at odds with experiment and QCD estimates: we discuss how this discrepancy is related to the description of chiral symmetry breaking in this model, and the possible solutions.

Authors:
; ;  [1]; ;  [1];  [2]
  1. Istituto Nazionale di Fisica Nucleare, Sezione di Bari (Italy)
  2. (Italy)
Publication Date:
OSTI Identifier:
21250758
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 78; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevD.78.055009; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; A0-980 MESONS; CHIRAL SYMMETRY; CONDENSATES; CORRELATION FUNCTIONS; COUPLING; DE SITTER GROUP; F0-980 MESONS; HOLOGRAPHY; MASS; MATHEMATICAL SOLUTIONS; PARTICLE DECAY; PSEUDOSCALAR MESONS; QUANTUM CHROMODYNAMICS; QUANTUM FIELD THEORY; REGGE TRAJECTORIES; SIMULATION; STRING MODELS; STRONG-COUPLING MODEL; SYMMETRY BREAKING; VECTOR MESONS

Citation Formats

Colangelo, P., De Fazio, F., Jugeau, F., Giannuzzi, F., Nicotri, S., and Dipartimento di Fisica, Universita di Bari. Light scalar mesons in the soft-wall model of AdS/QCD. United States: N. p., 2008. Web. doi:10.1103/PHYSREVD.78.055009.
Colangelo, P., De Fazio, F., Jugeau, F., Giannuzzi, F., Nicotri, S., & Dipartimento di Fisica, Universita di Bari. Light scalar mesons in the soft-wall model of AdS/QCD. United States. doi:10.1103/PHYSREVD.78.055009.
Colangelo, P., De Fazio, F., Jugeau, F., Giannuzzi, F., Nicotri, S., and Dipartimento di Fisica, Universita di Bari. Mon . "Light scalar mesons in the soft-wall model of AdS/QCD". United States. doi:10.1103/PHYSREVD.78.055009.
@article{osti_21250758,
title = {Light scalar mesons in the soft-wall model of AdS/QCD},
author = {Colangelo, P. and De Fazio, F. and Jugeau, F. and Giannuzzi, F. and Nicotri, S. and Dipartimento di Fisica, Universita di Bari},
abstractNote = {We study light scalar mesons in the holographic QCD soft-wall model with a background dilaton field. The masses and decay constants are compatible with experiment and QCD determinations if a{sub 0}(980) and f{sub 0}(980) are identified as the lightest scalar mesons; moreover, the states are organized in linear Regge trajectories with the same slope of vector mesons. Comparing the two-point correlation function of scalar operators derived on the anti-de Sitter side and in QCD, information about the condensates can be derived. Strong couplings of scalar states to pairs of light pseudoscalar mesons turn out to be small, at odds with experiment and QCD estimates: we discuss how this discrepancy is related to the description of chiral symmetry breaking in this model, and the possible solutions.},
doi = {10.1103/PHYSREVD.78.055009},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 5,
volume = 78,
place = {United States},
year = {2008},
month = {9}
}