An Improved Dilaton Background in Soft-Wall Model

TL;DR

This paper proposes a modified dilaton background in the soft-wall model using a new scalar field v.e.v. form, resulting in improved phenomenological results while maintaining Regge trajectories.

Contribution

It introduces a new dilaton background form in the soft-wall model, enhancing its predictive accuracy compared to existing models.

Findings

Achieves better results than current soft-wall and hard-wall models

Maintains Regge behavior with the new dilaton background

Provides a more accurate description of hadron spectra

Abstract

We adopted the form of v.e.v. of the bulk scalar field proposed by P.Zhang in this paper, and changed the dilaton background from $e^{-\kappa^2z^2}$ to $e^{-\kappa^2z^2+\alpha z}$ accordingly. The calculation shows that, as if we choose proper parameters, we can get a better result than both the present soft-wall models and the hard-wall model while keeping Regge behavior unchanged.