Light-front holographic QCD with generic dilaton profile

TL;DR

This paper extends light-front holographic QCD models by incorporating a generic dilaton profile, revealing how different profiles influence confinement and exotic meson spectra, aligning with recent experimental findings.

Contribution

It introduces a generalized dilaton profile into holographic QCD, connecting the dilaton power to confinement strength and meson spectra, and applies this to exotic mesons.

Findings

Higher power dilaton profiles lead to stronger confinement.

Results agree with experimental exotic meson spectra.

Short-distance interactions are weaker, long-distance interactions are stronger.

Abstract

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.