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>

Near-side jet peak broadening in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV

24 Sep 2016, 17:00
Shi-Yan Hall (East Lake International Conference Center)

Shi-Yan Hall

East Lake International Conference Center

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


Monika Kofarago (Nikhef National institute for subatomic physics (NL))


Two-particle angular correlation measurements are sensitive probes of the interactions of the medium formed in heavy-ion collisions and the particles propagating through it. Such measurements are done by determining the distribution of the relative pseudorapidity ($\Delta\eta$) and azimuthal angle ($\Delta\varphi$) of particles with respect to a higher $p_{\rm T}$ trigger particle ($1 < p_{\rm T,trig} < 8~\text{GeV}/c$). The near-side peak is fitted, accounting for $\Delta\eta$-independent long-range correlations, and the centrality evolution of the width (variance) of the fitted distribution is investigated. In Pb-Pb collisions a significant broadening of the near-side peak in the $\Delta\eta$ direction is observed from peripheral to central collisions, while in the $\Delta\varphi$ direction the peak is almost independent of centrality. For the 10% most central events, a departure from the Gaussian shape is also observed at low transverse momentum ($1 < p_{\rm T,assoc} < 2~\text{GeV}/c$, $1 < p_{\rm T,trig} < 3~\text{GeV}/c$). In this contribution the results obtained by the ALICE experiment in Pb-Pb and pp collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV will be shown, and they will be interpreted in terms of radial and elliptic flow by comparing them to AMPT model simulations.

Presentation type Oral

Primary author

Monika Kofarago (Nikhef National institute for subatomic physics (NL))

Presentation Materials