Eur. Phys. J. C (2016) 76: 22
https://doi.org/10.1140/epjc/s10052-015-3866-y

Regular Article - Theoretical Physics

Infrared-improved soft-wall AdS/QCD model for mesons

¹ State Key Laboratory of Theoretical Physics (SKLTP), Beijing, People’s Republic of China
² Kavli Institute for Theoretical Physics China (KITPC), Beijing, People’s Republic of China
³ Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
⁴ University of Chinese Academy of Sciences (UCAS), Beijing, People’s Republic of China

^* e-mail: fangzhen@itp.ac.cn

Received: 24 September 2015
Accepted: 22 December 2015
Published online: 19 January 2016

Abstract

We construct and investigate an infrared-improved soft-wall AdS/QCD model for mesons. Both linear confinement and chiral symmetry breaking of low energy QCD are well characterized in such an infrared-improved soft-wall AdS/QCD model. The model enables us to obtain a more consistent numerical prediction for the mass spectra of resonance scalar, pseudoscalar, vector, and axial-vector mesons. In particular, the predicted mass for the lightest ground state scalar meson shows good agreement with the experimental data. The model also provides a remarkable check for the Gell-Mann–Oakes–Renner relation and a sensible result for the space-like pion form factor.