In this work, the distance between a quark-antiquark pair inside the hadron is analyzed depending on the confinement potential and total cross section. Using Helmholtz free energy, entropy is calculated near the minimum of the total cross section through the confinement potential, whereas a fitting procedure for the proton-proton total cross section is performed, defining the fitting parameters. As result, the only free parameter in the model is the mass scale κ used to define the running coupling constant from the light-front approach to QCD. The mass scale controls the distance r between the quark-antiquark pair and, under some conditions, can occur the emergence of free quarks in the confinement regime of QCD.
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