Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at (Formula presented.) TeV with the ATLAS detector
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ATLAS measurements of the azimuthal anisotropy in lead–lead collisions at TeX TeV are shown using a dataset of approximately 7 TeX b TeX collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta \(0.5 GeV and in the pseudorapidity range TeX . The anisotropy is characterized by the Fourier coefficients, TeX , of the charged-particle azimuthal angle distribution for TeX –4. The Fourier coefficients are evaluated using multi-particle cumulants calculated with the generating function method. Results on the transverse momentum, pseudorapidity and centrality dependence of the TeX coefficients are presented. The elliptic flow, TeX , is obtained from the two-, four-, six- and eight-particle cumulants while higher-order coefficients, TeX and TeX , are determined with two- and four-particle cumulants. Flow harmonics TeX measured with four-particle cumulants are significantly reduced compared to the measurement involving two-particle cumulants. A comparison to TeX measurements obtained using different analysis methods and previously reported by the LHC experiments is also shown. Results of measurements of flow fluctuations evaluated with multi-particle cumulants are shown as a function of transverse momentum and the collision centrality. Models of the initial spatial geometry and its fluctuations fail to describe the flow fluctuations measurements.
CitationEuropean Physical Journal C
PublisherSpringer Berlin Heidelberg
SubjectElementary ParticlesQuantum Field TheoryNuclear PhysicsHeavy IonsHadronsQuantum Field TheoriesString TheoryMeasurement Science and InstrumentationAstronomyAstrophysics and CosmologyNuclear Energy
Copyright CERN for the benefit of the ATLAS collaboration 2014. This article is published with open access at Springerlink.com