Abstract
We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at sqrt[S(NN)] =2.76 TeV with the ALICE detector at the CERN Large Hadron Collider. The measurement is performed in the central pseudorapidity region (|η|<0.8) and transverse momentum range 0.2<p t<5.0 GeV/c. The elliptic flow signal v₂, measured using the 4-particle correlation method, averaged over transverse momentum and pseudorapidity is 0.087 ± 0.002(stat) ± 0.003(syst) in the 40%-50% centrality class. The differential elliptic flow v₂ p t reaches a maximum of 0.2 near p t =3 GeV/c. Compared to RHIC Au-Au collisions at sqrt[S(NN)] 200 GeV, the elliptic flow increases by about 30%. Some hydrodynamic model predictions which include viscous corrections are in agreement with the observed increase.
Highlights
The goal of ultrarelativistic nuclear collisions is the creation and study of the quark-gluon plasma (QGP), a state of matter whose existence at high energy density is predicted by quantum chromodynamics
(Received 18 November 2010; published 13 December 2010) We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at pffisffiffiNffiffiNffiffiffi 1⁄4 2:76 TeV with the ALICE detector at the CERN Large Hadron Collider
The second moment of the final state hadron azimuthal distribution is called elliptic flow; it is a response of the dense system to the initial conditions and sensitive to the early and hot, strongly interacting phase of the evolution
Summary
The goal of ultrarelativistic nuclear collisions is the creation and study of the quark-gluon plasma (QGP), a state of matter whose existence at high energy density is predicted by quantum chromodynamics. (Received 18 November 2010; published 13 December 2010) We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at pffisffiffiNffiffiNffiffiffi 1⁄4 2:76 TeV with the ALICE detector at the CERN Large Hadron Collider. The measurement is performed in the central pseudorapidity region (jj < 0:8) and transverse momentum range 0:2 < pt < 5:0 GeV=c.
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