Dilepton Spectroscopy of QCD Matter at Collider Energies

Figure 1

Compilation of experimental data for the ratio, 𝑅, of cross sections for 𝑒⁺𝑒⁻→hadrons over 𝑒⁺𝑒⁻→𝜇⁺𝜇⁻, as a function of invariant mass √𝑠=𝑀. Figure taken from [33].