Possible Evidence for Neutral Color-Singlet $q\bar{q}$ Quark Matter from High-Energy Pb-Emulsion Collisions

Cheuk-Yin Wong

The invariant mass spectrum of $e^{+}{e}^{-}$ pairs produced in high-energy Pb-emulsion collisions at 160 A GeV at CERN SPS exhibits a highly complex structure of a broad enhancement at…