Chiral phase transition and meson spectrum in improved soft-wall AdS/QCD

• Published in: Physics letters. B Vol. 762; pp. 86 - 95
• Main Authors: Fang, Zhen, Wu, Yue-Liang, Zhang, Lin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 10.11.2016; Elsevier
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2016.09.009

We investigate in detail the chiral thermal transition of QCD in an improved soft-wall AdS/QCD model with a simply modified 5D conformal mass of the bulk scalar field. We also present a calculation in this model for the light meson spectra and other low-energy characteristic quantities including the pion form factor, the π–ρ coupling constant and the decay constants of π, ρ, a1, which are shown to result in a good agreement with experimental data except for the pion decay constant. The thermal behavior of chiral condensate is studied. It is found that such a simply improved soft-wall model incorporates the crossover behavior of chiral thermal transition indicated by lattice simulations. The expected chiral transition temperature can be obtained.