Abstract
We present measurements of untriggered di-hadron correlations as a function of centrality in Pb–Pb TeV collisions, for charged hadrons with pT > 0.15 GeV/c. These measurements provide a map of the bulk correlation structures in heavy-ion collisions. Contributions to these structures may come from jets, initial density fluctuations, elliptic flow, resonances and/or momentum conservation. We decompose the measured correlation functions via a multi-parameter fit in order to extract the nearside Gaussian, the longer range Δη correlation often referred to as the soft ridge. The effect of including higher harmonics (v3 and v4) in this procedure will be discussed. We investigate how the nearside Gaussian scales with the number of binary collisions. Finally, we show the charge dependence of the nearside Gaussian.
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