Light-front holographic QCD with generic dilaton profile

We generalize the soft-wall and hard-wall models to a light-front holographic QCD model with a generic dilaton profile. The effective potential induced by a higher power dilaton profile is interpreted as a stronger color confinement at long distance, and it gradually evolves to the hard-wall model when the power increases to infinity. As an application, we investigate the exotic meson states recently discovered in experiments in the generic soft-wall model with a higher power dilaton profile, and the results are in agreement with the spectra of the exotic mesons. Our calculation indicates a weaker interaction at short distance and a stronger interaction at large distance for the components in the exotic mesons. The generic dilaton profile deserves further scrutiny for understanding the strong interaction and for applications.National Natural Science Foundation of China [11035003, 11120101004, 11475006]; Principal Fund for Undergraduate Research at Peking University; Training Program of Innovation for Undergraduates of Beijing; National Fund for Fostering Talents of Basic Science [J1103205, J1103206]; US Department of Energy [DE-FG02-03ER41231]SCI(E)ARTICLEzhaohengguo@pku.edu.cn; liutb@jlab.org; mabq@pku.edu.cn79