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

Fang, Zhen  (Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, PR China) (Kavli Institute for Theoretical Physics China, Chinese Academy of Sciences, Beijing, 100190, PR China) (School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, PR China) ; Wu, Yue-Liang (Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, PR China) (Kavli Institute for Theoretical Physics China, Chinese Academy of Sciences, Beijing, 100190, PR China) (School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, PR China) ; Zhang, Lin  (Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, PR China) (Kavli Institute for Theoretical Physics China, Chinese Academy of Sciences, Beijing, 100190, PR China) (School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, PR China)

13 September 2016

Abstract: 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.


Published in: Physics letters B (2016)
Published by: Elsevier
DOI: 10.1016/j.physletb.2016.09.009
License: CC-BY-3.0



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