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The spectra of charged hadrons produced near mid-rapidity in d+Au, p+Au andn+Au collisions at 200 GeV center of mass energy per nucleon pair are presentedas a function of transverse momentum and centrality. These measurements wereperformed using the PHOBOS detector at the Relativistic Heavy Ion Collider(RHIC). Nucleon-nucleus interactions were extracted from the d+Au data byidentifying the deuteron spectators. The deuteron spectators were measuredusing two calorimeters; one that detected forward-going single neutrons and anewly installed calorimeter that detected forward-going single protons. Thelarge suppression of high-pT hadron production in central Au+Au interactionsrelative to a naive superposition of p+pbar collisions has been interpreted asevidence of partonic energy loss in a dense medium. This interpretation isfounded upon the absence of such suppression in the yield of d+Au collisions.It is shown that d+Au is indeed a valid reference system, as hadron productionin d+Au agrees with a simple binary collision scaling of hadron production inp+Au. An ideal reference for Au+Au collisions is constructed using a weightedcombination of p+Au and n+Au yields and is found to be similar to the d+Aureference. Further, hadron production in p+Au interactions is compared to thatof n+Au interactions, in order to study the transport of charge from theinitial state to mid-rapidity. No asymmetry between the positively andnegatively charged hadron spectra of p+Au and n+Au interactions is observed forparticles having an average pseudo-rapidity of 0.8. A study of the Croninenhancement of hadrons produced in d+Au collisions using different centralitymeasures is also presented. A smooth evolution with centrality is observed,independent of the chosen centrality measure, when centrality is parameterizedby the multiplicity density measured near mid-rapidity.

Studies of Nucleon-Gold Collisions at 200 GeV per Nucleon Pair Using Tagged d+Au Interactions