Quark-diquark models and baryonic fluctuations in QCD

Abstract

We study the baryonic fluctuations of electric charge, baryon number and strangeness, by considering a realization of the Hadron Resonance Gas model in the light flavor sector of QCD. We elaborate on the idea that the susceptibilities can be saturated with excited baryonic states with a quark-diquark structure with a linearly confining interaction identical up to a constant to the quark-antiquark potential, $V_{qD}^{\prime }(r)=V_{q\bar{q}}^{\prime }(r)$. We obtain an overall good agreement with the spectrum obtained with other quark models and with lattice data for the fluctuations.

Comments: 6 pages, 5 figures. Talk given by E.Megias at the 22th International Conference in Quantum Chromodynamics (QCD 19), Montpellier, France, 2 - 5 Jul 2019