Event shape engineering with ALICE

Abstract

The strong fluctuations in the initial energy density of heavy-ion collisions allow an efficient selection of events corresponding to a specific initial geometry. For such "shape engineered events", the elliptic flow coefficient, $v_2$, of unidentified charged particles, pions and (anti-)protons in Pb-Pb collisions at $\snn = 2.76$ TeV is measured by the ALICE collaboration. $v_2$ obtained with the event plane method at mid-rapidity, $|\eta |<0.8$, is reported for different collision centralities as a function of transverse momentum, $\pt$, out to $\pt=20$ GeV/$c$. The measured $v_2$ for the shape engineered events is significantly larger or smaller than the average which demonstrates the ability to experimentally select events with the desired shape of the initial spatial asymmetry.

4 pages, 4 figures, Proceedings for Quark Matter 2012, Washington D.C., August 13-18, 2012

References in corpus (2)

• Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Ultra-relativistic nuclear collisions: event shape engineering

Cited by in corpus (4)

• Characterizing flow fluctuations with moments
• Event-shape fluctuations and flow correlations in ultra-relativistic heavy-ion collisions
• Collective Expansion at the LHC: selected ALICE anisotropic flow measurements
• Manipulating strong electromagnetic fields with the average transverse momentum of relativistic nuclear collisions