Untriggered di-hadron correlations in Pb-Pb collisions at $\sqrt{s_{NN}}=$ 2.76 TeV from ALICE

Abstract

We present measurements of untriggered di-hadron correlations as a function of centrality in Pb-Pb \sNN collisions, for charged hadrons with $p_T>0.15$ 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 $\Delta \eta$ correlation often referred to as the soft ridge. The effect of including higher harmonics ($v_3$ and $v_4$) 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.

4 pages, QM 2011 proceedings

References in corpus (3)

• Long Range Correlations and the Soft Ridge in Relativistic Nuclear Collisions
• Evolution of minimum-bias parton fragmentation in nuclear collisions
• Triggered di-hadron correlations in Pb--Pb collisions from the ALICE experiment

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