Master defence by Alexander Hansen – University of Copenhagen

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Master defence by Alexander Hansen

Abstract

One of the highlights of the heavy ion physics programme at the Relativistic Heavy Ion Collider (RHIC), was the observation that the produced Quark Gluon Plasma (QGP) behaves as a perfect liquid. This conclusion was based on the measurement of a large elliptic flow component, v2, and on the relevant comparison with different models. At the Large Hadron Collider (LHC) the first measurements of v2 in Pb+Pb collisions at √sNN = 2.76 TeV show an increase in v2 of up to 30% as compared to RHIC.
In this thesis a measurement of v2 over a wide pseudorapidity range (3.75 < η < 5) is presented for the first time, using the Forward Multiplicity Detector (FMD) and Silicon Pixel Detector (SPD) in ALICE. Two measurements are presented; one using a 2-particle correlation method, and one using a 4-particle correlation method. The results show a clear change in the shape of v2(η) compared to what was seen at RHIC. It is also found that in the rest frame of one of the colliding nuclei, v2(η) scales in a similar way over 2 orders of magnitude in centre of mass energy.

Supervisor:

  • Jens Jørgen Gaardhøje