Evidence from Identified Particles for Active Quark and Gluon Degrees of Freedom

Abstract

Measurements of intermediate pT (1.5 < pT < 5.0 GeV/c) identified particle distributions in heavy ion collisions at SPS and RHIC energies display striking dependencies on the number of constituent quarks in the corresponding hadron. One finds that elliptic flow at intermediate pT follows a constituent quark scaling law as predicted by models of hadron formation through coalescence. In addition, baryon production is also found to increase with event multiplicity much faster than meson production. The rate of increase is similar for all baryons, and seemingly independent of mass. This indicates that the number of constituent quarks determines the multiplicity dependence of identified hadron production at intermediate pT. We review these measurements and interpret the experimental findings.

8 pages, 5 figures, proceedings for SQM2006 conference in Los Angeles

References in corpus (4)

• Anisotropic flow at RHIC: How unique is the number-of-constituent-quark scaling?
• Measurements of identified particles at intermediate transverse momentum in the STAR experiment from Au+Au collisions at sqrt{s_{NN}}=200 GeV
• Novel mechanism of high-$p_T$ production from an opaque quark-gluon plasma
• Thesis: Pion, Kaon, Proton and Antiproton Spectra in d+Au and p+p Collisions at $\sqrt{s_{NN}}$= 200GeV at the Relativistic Heavy Ion Collider

Cited by in corpus (2)

• Coalescence Models For Hadron Formation From Quark Gluon Plasma
• Phase-Space Coalescence for heavy and light quarks at RHIC