Hadron spectra and pion form factor in dynamical holographic QCD model with anomalous 5D mass of scalar field
Ruixiang Chen (School of Nuclear Science and Technology, University of Chinese Academy of Sciences, China); Danning Li (Department of Physics and Siyuan Laboratory, Jinan University, China); Kazem Bitaghsir Fadafan (Faculty of Physics, Shahrood University of Technology, Iran); Mei Huang (School of Nuclear Science and Technology, University of Chinese Academy of Sciences, China)
The simplest version of the dynamical holographic QCD model is described by adding the KKSS model action on a dilaton-graviton coupled background, in which the AdS $ _5 $ metric is deformed by the gluon condensation and further deformed by the chiral condensation. In this framework, both the chiral symmetry breaking and linear confinement can be realized. The light-flavor hadron spectra and the pion form factor were investigated, but it was difficult to reconcile the light-flavor hadron spectra and pion form factor. By considering the anomalous 5-dimension mass correction of the scalar field from QCD running coupling, it is found that the light flavor hadron spectra and pion form factor can be described well simultaneously. In particular, the ground state and lower excitation states of the scalar, pseudo scalar, and axial vector meson spectra are improved. However, the vector meson spectra are not sensitive to the anomalous 5-dimension mass correction of the scalar field.
