Holographic quark masses and radiative decays of heavy vector mesons

TL;DR

This paper uses holographic QCD models to compute heavy vector meson properties and derives new observables like decay widths and constituent quark masses, comparing results with experimental data to propose a new meson spectroscopy paradigm.

Contribution

It introduces a novel holographic approach to derive meson observables, connecting AdS/QCD models with non-relativistic quark phenomenology.

Findings

Derived new observables such as constituent quark mass and decay widths from holography.

Compared holographic predictions with experimental data, showing good agreement.

Proposed a new paradigm for meson spectroscopy in AdS/QCD.

Abstract

Holographic models of QCD provide the spectrum of heavy vector meson masses and electromagnetic decay constants through bulk computations of the current-current correlation function. Conversely, the phenomenology of heavy vector mesons is articulated by the constituent heavy quark model utilizing a non-relativistic approximation. By applying the Segre formula from non-relativistic quantum mechanics, we derive new observables from holography: the constituent quark mass, the three-photon decay width, the effective fine structure constant of the strong interaction, and the mixed one-photon and two-gluon decay width. We also derive the three-gluon decay width, the three-photon decay width, and the mixed one-photon and two-gluon decay width for the radially excited states of heavy quarkonia and compare them with available experimental data. The present results reveal a new paradigm of meson spectroscopy in AdS/QCD.