Hot and dense matter
Prof. Dr. Dirk RischkeGoethe-UniversitätInstitut für Theoretische PhysikMax-von-Laue-Str. 160438 Frankfurt
By means of electromagnetic probes, one can learn something about the interior of hot and dense matter.
Usually hadrons consist of 3 quarks or a quark-antiquark pair. But theoretically also states with four quarks are conceivable.