U(1)A axial anomaly, η′, and topological susceptibility in the holographic soft-wall model

The singlet pseudoscalar sector of light mesons is investigated in the soft-wall model, a bottom-up approach to the AdS/QCD correspondence. The eta' mass results from the mixing among the fields dual to the axial current, pseudoscalar current and the G (G) over tilde operator. The topological susceptibility is computed for any quark mass, and the Witten-Veneziano relation is obtained in the large N-c limit.

Automated summary

The singlet pseudoscalar sector of light mesons was investigated in the soft-wall model, utilizing a bottom-up approach to the AdS/QCD correspondence. The eta' mass arises from the mixing of fields dual to the axial current, pseudoscalar current, and the G (G) over tilde operator. The topological susceptibility was calculated for any quark mass, and the Witten-Veneziano relation was derived in the large Nc limit.