Abstract
Triggered di-hadron correlation studies using central Au+Au collisions at = 200 GeV in STAR revealed a novel ridge-like structure in two dimensions (Δη, Δϕ) for high pT particles. A similar structure is also present in an inclusive un-triggered di-hadron correlation analysis. We study the ⟨pT⟩ evolution of di-hadron correlations by increasing the lower pT acceptance of both charged particles. A smooth evolution of data is observed and our results reproduce the triggered analysis structure near ⟨pT⟩ = 2.7 GeV/c. We quantify the correlation structure evolution by fitting a model function. The model function emphasizes possible initial state fluctuation contributions via the use of higher harmonic model components vn (n=1,2,3,4,5) and a remainder which is modeled via an asymmetric 2d Gaussian. The extracted parameters are compared to model predictions and p+p data at = 200 GeV and possible origins of the nearside structure are discussed.
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