# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
darmstadtium
Europe/Zurich timezone

## Untriggered di-hadron correlations in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV with the ALICE experiment

20 May 2014, 16:30
2h
spectrum (darmstadtium)

### spectrum

#### darmstadtium

Board: I-30
Poster Correlations and Fluctuations

### Speaker

Danthasinghe Piyarathna (University of Houston (US))

### Description

We present measurements of untriggered di-hadron correlations in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. The momentum evolution of untriggered data has been studied by applying symmetric $p_{\rm T}$ cuts. A smooth evolution of the structures in the correlation function is observed. We further quantify the evolution of the contributing components by fitting a model function. The model function quantifies possible initial state fluctuation contributions via the use of higher harmonics, $v_{n}$ ($n = 2, 3, 4, 5$). The near side jet peak is modeled with an asymmetric 2D Gaussian . In order to model non-flow contributions the Fourier harmonics are shown with and without such a 2D Gaussian. Extracted harmonics parameters are compared with IP Glasma model predictions.
On behalf of collaboration: ALICE

### Primary author

Danthasinghe Piyarathna (University of Houston (US))

 Slides