Rapidity densities of π±, K± and p in p+p and d+Au collisions at GeV

Abstract

The study of p+p and d+Au collisions can help establish the size-dependent effects seen in Au+Au measurements. Rapidity densities of π±, K± and p are presented for p+p and d+Au collisions, with the centrality dependence of these densities explored for the d+Au collisions. The scaling of the rapidity density by the number of participants ⟨Npart⟩ or number of proton participants involved in the collisions may reveal different physics at mid-rapidity and forward rapidities. The comparison of the rapidity densities of charged hadrons and net-protons in the central Au+Au collisions with smaller control systems such as p+p and d+Au will help us to understand the baryon transport in these systems. Rapidity densities of identified charged hadrons (π±, K± and p ) measured by the BRAHMS experiment in different systems are compared.