Counting valence quarks at RHIC and LHC

We consider the nuclear modification ratios in heavy ion collisions, RCP and RAA, in the region of intermediate transverse momentum, and study the dependency upon the constituent quark composition of the observed hadron. Adopting a two component recombination/fragmentation model, validated by experimental information from STAR and PHENIX, we show that a clear distinction is predicted for the f0(980) between the assumptions of ss¯ or diquark-antidiquark content.