Charged-particle multiplicity and pseudorapidity distributions measured with the PHOBOS detector inAu+Au,Cu+Cu,d+Au, andp+pcollisions at ultrarelativistic energies

Pseudorapidity distributions of charged particles emitted in Au+Au, Cu+Cu, d+Au, and p+p collisions over a wide energy range have been measured using the PHOBOS detector at the BNL Relativistic Heavy-Ion Collider (RHIC). The centrality dependence of both the charged particle distributions and the multiplicity at midrapidity were measured. Pseudorapidity distributions of charged particles emitted with |{eta}