Number of Quark Participant Scaling of $\langle dN_{ch}/d\eta \rangle$ and $\langle dE_{T}/d\eta \rangle$ with Centrality for 200 GeV d+Au Collisions and Au+Au Collisions from 7.7 to 200 GeV

20 May 2014, 16:30
spectrum (darmstadtium)



Board: B-10
Poster QCD Phase Diagram Poster session


Jeffery Mitchell (Brookhaven National Laboratory)


The dependence of charged particle production and transverse energy production in relativistic heavy ion collisions has been comprehensively studied as a function of $\sqrt{s_{NN}}$ from 7.7 to 200 GeV and centrality represented as the average number of nucleon participants, $\langle N_{part} \rangle$, in the collision. The general trend of the data exhibits a decrease in the value of $\langle dN_{ch}/d\eta \rangle$ and $\langle dE_{T}/d\eta \rangle$ at mid-rapidity normalized by the number of participant pairs as $\langle N_{part} \rangle$ decreases. However, it has been demonstrated that identified particle flow data scales with the number of constituent quarks over a large range of collision energies, so the number of quark participants may be a more appropriate scaling variable for particle production. The average number of quark participants, $\langle N_{qp} \rangle$, as a function of centrality is estimated using a modified Glauber model that replaces each nucleon participant with quark participants. This estimate is then used to investigate the $N_{qp}$-scaling of $\langle dN_{ch}/d\eta \rangle$ and $\langle dE_{T}/d\eta \rangle$ using PHENIX data for 200 GeV d+Au collisions and for Au+Au collisions at $\sqrt(s_{NN})=$ 200, 62.4, 39, 27, 19.6, and 7.7 GeV with special emphasis on the validity of scaling with $\langle N_{qp} \rangle$ at the lower energies.
On behalf of collaboration: PHENIX

Primary author

Jeffery Mitchell (Brookhaven National Laboratory)

Presentation Materials