Quark-diquark models and baryonic fluctuations in QCD

TL;DR

This paper investigates baryonic fluctuations in QCD using a quark-diquark model within the Hadron Resonance Gas framework, showing good agreement with lattice data and other models for susceptibilities.

Contribution

It introduces a quark-diquark based realization of the Hadron Resonance Gas model to describe baryonic fluctuations in QCD.

Findings

Good agreement with lattice QCD data for fluctuations

Spectrum matches other quark models

Susceptibilities can be saturated with excited baryonic states

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.