# QM 2011 - XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

## Rapidity and centrality dependence of identiﬁed hadrons in Au+Au and p+p collisions at 200 GeV

Not scheduled
Théâtre National (Centre Bonlieu)

### Théâtre National

#### Centre Bonlieu

France
Board: 45
Poster Global and collective dynamics

### Speaker

Dr Catalin for BRAHMS Collaboration Ristea (University of Bucharest)

### Description

The BRAHMS collaboration has measured identified particles from AuAu and pp collisions at 200GeV over 3 units of rapidity. We will investigate the scaling of pion and kaon production with Ncoll and Npart at both central and forward rapidities. The kaon to pion ratio serves as a measure of equilibration of strange quarks. BRAHMS has found that for central collisions the K-/K+ ratio is strongly correlated to the pbar/p ratio. We will show how this correlation evolves with the centrality of the system. We will also show the centrality dependence of R_AA(Pt) at both central and forward rapidity for both mesons and baryons. For central collisions BRAHMS has already shown that R_AA does not depend strongly on rapidity but these data represent the first time that the centrality dependence of R_AA has been measured at forward rapidity. These data thus provide a summary of hadron production over a very wide rapidity and centrality range.

### Primary authors

Dr Catalin for BRAHMS Collaboration Ristea (University of Bucharest) Dr Oana Ristea (University of Bucharest)

 Poster