The                    experiment at RHIC

PHOBOS Collaboration

Physics of RHIC

PHOBOS apparatus

Data-taking in RHIC Year-1

First Measurements

Charged Multiplicity at h=0

Centrality: Participants vs. Spectators

Measuring Centrality in PHOBOS

Estimate of N_part

Uncertainty on N_part

Tracklets to measure dN/dh

Measuring Vertex

Corrections to dN/dh

Results

Results compared with pp/pp

Progress on new results

Predictions for dN/dh vs N_part

Tracklets in the VTX detector

dN/dEta in the Multiplicity Array

Tracking and Particle ID

Elliptic Flow

Conclusions