Counting valence quarks at RHIC and LHC

Abstract

We consider the Nuclear Modification Ratios in heavy ion collisions, R_CP and R_AA, 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 $s\bar{s}$ or diquark-antidiquark content.

Comments: 14 pages, 11 eps figures, added figures and minor corrections, to appear in Phys. Lett. B