Baryon Physics in Holographic QCD

TL;DR

This paper models baryons as stable solitons in a holographic QCD framework with a Chern-Simons term, predicting properties consistent with experimental data and analyzing anomalous meson processes.

Contribution

It introduces a holographic QCD model with a Chern-Simons term where baryons are stable solitons larger than the cutoff scale, enabling reliable predictions.

Findings

Predicted nucleon properties agree with experimental data.

Calculated anomalous meson decay amplitudes match observed values.

Achieved a 16% overall agreement with experimental measurements.

Abstract

In a simple holographic model for QCD in which the Chern-Simons term is incorporated to take into account the QCD chiral anomaly, we show that baryons arise as stable solitons which are the 5D analogs of 4D skyrmions. Contrary to 4D skyrmions and previously considered holographic scenarios, these solitons have sizes larger than the inverse cut-off of the model, and therefore they are predictable within our effective field theory approach. We perform a numerical determination of several static properties of the nucleons and find a satisfactory agreement with data. We also calculate the amplitudes of ``anomalous'' processes induced by the Chern-Simons term in the meson sector, such as omega -> pi gamma and omega -> 3pi. A combined fit to baryonic and mesonic observables leads to an agreement with experiments within 16%.