Event shape engineering for inclusive spectra and elliptic flow in Pb--Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

Submission Date: 
22/07/2015
Article Information
Submission Form
System: 
Pb-Pb
Energy: 
2.76 TeV
Abstract Plain Text: 

Recent measurements and model calculations indicate strong event-by-event fluctuations in anisotropic
flow. This makes the selection of the events corresponding to the same centrality, but very dif-
ferent average flow, possible: the so-called event shape engineering (ESE). We report the first re-
sults obtained by the ALICE collaboration with the ESE technique applied to Pb-Pb collisions at
$\sqrt{s_{NN}}$ = 2.76 TeV. We find the effect of event-shape selection on the elliptic flow coefficient v$_{2}$ to be
almost independent on transverse momentum p$_{T}$ , indicating p$_{T}$ independence of flow fluctuations,
as expected if these are due to fluctuations in the initial geometry of the system. Charged hadrons
and identified particle spectra are found to be harder in events with higher-than-average elliptic flow,
indicating an interplay between radial flow and the initial configuration of the system.

 

Paper proposal talk: https://indico.cern.ch/event/330026/session/1/contribution/0/material/sl...