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dc.contributor.authorAad, Georgeseng
dc.contributor.authorAbbott, Bradeng
dc.contributor.authorAbdallah, Jalaleng
dc.contributor.authorAbdel Khalek, Samaheng
dc.contributor.authorAbdelalim, Ahmed Alieng
dc.contributor.authorAbdesselam, Abdeleng
dc.contributor.authorAbdinov, Ovsat Bahram oglueng
dc.contributor.authorAbi, Babakeng
dc.contributor.authorAbolins, Mariseng
dc.contributor.authorAbouZeid, Hasseng
dc.contributor.authorBuanes, Trygveeng
dc.contributor.authorBurgess, Thomaseng
dc.contributor.authorEigen, Geraldeng
dc.contributor.authorJohansen, Lars Gimmestadeng
dc.contributor.authorKastanas, Alexeng
dc.contributor.authorLiebig, Wolfgangeng
dc.contributor.authorLipniacka, Annaeng
dc.contributor.authorRosendahl, Peter Lundgaardeng
dc.contributor.authorSandaker, Heidieng
dc.contributor.authorSjursen, Therese B.eng
dc.contributor.authorStugu, Bjarneeng
dc.contributor.authorTonoyan, Arshakeng
dc.contributor.authorUgland, Mareneng
dc.contributor.authorBugge, Larseng
dc.contributor.authorBuran, Torleiveng
dc.contributor.authorCameron, David Gordoneng
dc.contributor.authorCzyczula, Zofiaeng
dc.contributor.authorGjelsten, Børge Kileeng
dc.contributor.authorLund, Esbeneng
dc.contributor.authorOuld-Saada, Farideng
dc.contributor.authorPajchel, Katarinaeng
dc.contributor.authorPylypchenko, Yuriyeng
dc.contributor.authorRead, Alexander Lincolneng
dc.contributor.authorRøhne, Ole Myreneng
dc.contributor.authorSamset, Bjørn Hallvardeng
dc.contributor.authorStapnes, Steinareng
dc.contributor.authorStrandlie, Areeng
dc.contributor.authorAbramowicz, Halinaeng
dc.contributor.authorAcerbi, Emilioeng
dc.contributor.authorAdamczyk, Leszekeng
dc.contributor.authorAdams, Davideng
dc.contributor.authorAddy, Tetteh N.eng
dc.contributor.authorAdelman, Jareedeng
dc.contributor.authorAdomeit, Stefanieeng
dc.contributor.authorAdragna, Paoloeng
dc.contributor.authorAdye, Timeng
dc.contributor.authorAefsky, Scott Alaneng
dc.contributor.authorAguilar Saavedra, Juan Antonioeng
dc.contributor.authorAharrouche, Mohamedeng
dc.contributor.authorAhlen, Steveneng
dc.contributor.authorATLAS, Collaborationeng
dc.date.accessioned2015-09-22T11:28:23Z
dc.date.available2015-09-22T11:28:23Z
dc.date.issued2012-07-24
dc.identifier.issn0556-2813en_US
dc.identifier.urihttps://hdl.handle.net/1956/10493
dc.description.abstractDifferential measurements of charged particle azimuthal anisotropy are presented for lead-lead collisions at \(\sqrt{s_{NN}}\) = 2.76 TeV with the ATLAS detector at the LHC, based on an integrated luminosity of approximately 8 \(\mu b^{-1}\). This anisotropy is characterized via a Fourier expansion of the distribution of charged particles in azimuthal angle \(\phi\) , with the coefficients \(v_n\) denoting the magnitude of the anisotropy. Significant \(v_2-v_6\) values are obtained as a function of transverse momentum (0.5<pT<20 GeV), pseudorapidity (|\).eta\).<2.5) and centrality using an event plane method. The \(v_n\) values for \(n\ge3\) are found to vary weakly with both \(\eta\) and centrality, and their pT dependencies are found to follow an approximate scaling relation, \(v_n^{1/n}(pT) \propto v_2^{1/2}(pT)\). A Fourier analysis of the charged particle pair distribution in relative azimuthal angle \((\Delta\phi=\phi_a-\phi_b)\) is performed to extract the coefficients \(v_{n,n}=<cos (n \Delta\phi)>\). For pairs of charged particles with a large pseudorapidity gap \((|\Delta\eta=\eta_a-\eta_b|>2)\) and one particle with pT<3 GeV, the \(v_{2,2}-v_{6,6}\) values are found to factorize as \(v_{n,n}(pT^a,pT^b) \sim v_n(pT^a)v_n(pT^b)\) in central and mid-central events. Such factorization suggests that these values of \(v_{2,2}-v_{6,6}\) are primarily due to the response of the created matter to the fluctuations in the geometry of the initial state. A detailed study shows that the \(v_{1,1}(pT^a,pT^b)\) data are consistent with the combined contributions from a rapidity-even \(v_1\) and global momentum conservation. A two-component fit is used to extract the \(v_1\) contribution. The extracted \(v_1\) is observed to cross zero at \(pT\sim\) 1.0 GeV, reaches a maximum at 4-5 GeV with a value comparable to that for \(v_3\). and decreases at higher pT.en_US
dc.language.isoengeng
dc.publisherAmerican Physical Societyen_US
dc.rightsAttribution CC BYeng
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/eng
dc.titleMeasurement of the azimuthal anisotropy for charged particle production in \(\sqrt{s_{NN}}\) = 2.76 TeV lead-lead collisions with the ATLAS detectoren_US
dc.typePeer reviewed
dc.typeJournal article
dc.date.updated2015-07-30T08:35:46Z
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2012 CERN, for the ATLAS Collaborationen_US
dc.source.articlenumber014907
dc.identifier.doihttps://doi.org/10.1103/physrevc.86.014907
dc.identifier.cristin1194747
dc.source.journalPhysical Review C. Nuclear Physics
dc.source.4086
dc.source.141
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431
dc.subject.nsiVDP::Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431


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