CERN Accelerating science

ATLAS Note
Report number	ATL-PHYS-PROC-2012-216
Title	Flow and Correlations in Pb-Pb Collisions at $sqrt{s_{NN}}$ = 2.76 TeV with the ATLAS Detector at the LHC
Author(s)	Trzupek, A (Cracow, INP)
Corporate Author(s)	The ATLAS collaboration
Publication	2012
Imprint	10 Oct 2012
Number of pages	8
In:	23rd International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Washington, DC, USA, 13 - 18 Aug 2012
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	heavy-ion collisions ; Quark-Gluon Plasma ; perfect liquid ; azimuthal anisotropy ; elliptic flow ; directed flow ; event-by-event flow harmonic fluctuations ; reaction plane correlations ; two-particle correlations ; cumulants ; HEAVYIONS
Abstract	Recent measurements from the ATLAS experiment of the azimuthal anisotropy of hadron production in the relativistic Pb-Pb collisions at the Large Hadron Collider (LHC) are presented. The results on the integrated and differential flow harmonics were obtained using variety of approaches, e.g. the event plane, two-particle correlations, two- and four-particle cumulant methods, over a wide range of centrality (0-80%), pseudorapidity ($|eta|<$2.5) and transverse momentum (0.03-200 GeV) of charged particles and jets. These detailed measurements at low- and high-$p_T$ provide new insights into the hydrodynamic picture of the Quark-Gluon Plasma and probe the path-length dependence of partonic energy loss in dense medium. Fluctuations in the geometry of the initial interaction region are studied by the measurement of event-by-event $v_2-v_4$ harmonics as well as by flow harmonics from the cumulant method. Additional information on initial geometry fluctuations is provided by measurement of the dipole flow ($v_1$) as well as by the correlations of two and three reaction plane azimuthal angles of different harmonics.
Copyright/License	Preprint: (License: CC-BY-4.0)

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