# Hard Probe 2016

22-27 September 2016
East Lake International Conference Center
Asia/Chongqing timezone
<a href="http://hp2016.ccnu.edu.cn">http://hp2016.ccnu.edu.cn</a>

## $\pi^0$-hadron correlations in pp and Pb-Pb collisions and $\pi^0$ elliptic flow in Pb-Pb collisions measured at the ALICE experiment

25 Sep 2016, 08:30
20m
Shi-Yan Hall (East Lake International Conference Center)

### Shi-Yan Hall

#### East Lake International Conference Center

Donghu Road 142, Wuchang District, Wuhan, Hubei, China

### Speaker

Xinye Peng (Central China Normal University CCNU (CN))

### Description

The study of the azimuthal correlation and anisotropy with $\pi^0$ offers a powerful way to investigate the properties of strongly interacting matter created in ultra-relativistic heavy-ion collisions. In this talk, we present the measurement of two-particle correlations of $\pi^0$ trigger particles with associated charged particles versus azimuthal angle difference ($\Delta\varphi$) in pp and central Pb–Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV, as well as the measurement of the elliptic flow ($v_2$) of π0 in Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV at the ALICE experiment. $\pi^0$ are detected by the ALICE electromagnetic calorimeter EMCal for transverse momenta $8< p_T <16$ GeV/c, and charged particles are measured by the ALICE main tracking detectors ITS and TPC for $0.5 < p_T < 10$ GeV/c, both at mid-rapidity. For $\pi^0$-hadron correlations, the per-trigger yield modification factors ($I_{AA}$) are extracted on the near and away side and are compared with results from models and other experiments. For $\pi^0$ $v_2$, the current status will be presented. Both measurements serve as important investigation of the medium modified fragmentation pattern and the path-length dependence of energy loss in QGP, as well as the corresponding physics interpretation.

Presentation type Oral

### Primary author

Xinye Peng (Central China Normal University CCNU (CN))