8-13 August 2011
Rhode Island Convention Center
US/Eastern timezone

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

10 Aug 2011, 14:50
552 B (Rhode Island Convention Center)

552 B

Rhode Island Convention Center

Parallel contribution Heavy Ion Physics/Hot and Dense QCD Heavy Ion Physics/Hot and Dense QCD


Dr Anthony Robert Timmins (University of Houston)


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.

Primary author

Dr Anthony Robert Timmins (University of Houston)

Presentation Materials