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Abstract:

Differential measurements of charged particle azimuthal anisotropy are presented for lead-lead collisions at √s NN = 2.76 TeV with the ATLAS detector at the LHC, based on an integrated luminosity of approximately 8 μb − 1 . This anisotropy is characterized via a Fourier expansion of the distribution of charged particles in azimuthal angle relative to the reaction plane, 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 < p T < 20 GeV), pseudorapidity (|η| < 2.5), and centrality using an event plane method. The v n values for n ≥ 3 are found to vary weakly with both η and centrality, and their p T dependencies are found to follow an approximate scaling relation, v 1/n n (p T ) ∝ v 1/2 2 (p T ), except in the top 5% most central collisions. A Fourier analysis of the charged particle pair distribution in relative azimuthal angle (Δϕ = ϕ a − ϕ b ) is performed to extract the coefficients v n, n = (cos nΔϕ). For pairs of charged particles with a large pseudorapidity gap (|Δη = η a − η b | > 2) and one particle with p T < 3 GeV, the v 2,2 –v 6,6 values are found to factorize as v n, n (p a T , p b T ) ≈ v n (p a T )v n (p b T ) in central and midcentral events. Such factorization suggests that these values of v 2,2 –v 6,6 are primarily attributable 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 (p a T , p b T ) 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 isobserved to cross zero at p T ≈ 1.0 GeV, reaches a maximum at 4–5 GeV with a value comparable to that for v 3 , and decreases at higher p T . © 2012 CERN, for the ATLAS Collaboration.

Registro:

Documento: Artículo
Título:Measurement of the azimuthal anisotropy for charged particle production in √S NN = 2.76 TeV lead-lead collisions with the ATLAS detector
Autor:Aad, G. et al.
Este artículo contiene 3048 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 3048 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Año:2012
Volumen:86
Número:1
Página de inicio:014907-1
Página de fin:014907-41
DOI: http://dx.doi.org/10.1103/PhysRevC.86.014907
Título revista:Physical Review C - Nuclear Physics
Título revista abreviado:Phys. Rev. C Nucl. Phys.
ISSN:05562813
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562813_v86_n1_p014907-1_Aad

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Citas:

---------- APA ----------
(2012) . Measurement of the azimuthal anisotropy for charged particle production in √S NN = 2.76 TeV lead-lead collisions with the ATLAS detector. Physical Review C - Nuclear Physics, 86(1), 014907-1-014907-41.
http://dx.doi.org/10.1103/PhysRevC.86.014907
---------- CHICAGO ----------
Aad, G. "Measurement of the azimuthal anisotropy for charged particle production in √S NN = 2.76 TeV lead-lead collisions with the ATLAS detector" . Physical Review C - Nuclear Physics 86, no. 1 (2012) : 014907-1-014907-41.
http://dx.doi.org/10.1103/PhysRevC.86.014907
---------- MLA ----------
Aad, G. "Measurement of the azimuthal anisotropy for charged particle production in √S NN = 2.76 TeV lead-lead collisions with the ATLAS detector" . Physical Review C - Nuclear Physics, vol. 86, no. 1, 2012, pp. 014907-1-014907-41.
http://dx.doi.org/10.1103/PhysRevC.86.014907
---------- VANCOUVER ----------
Aad, G. Measurement of the azimuthal anisotropy for charged particle production in √S NN = 2.76 TeV lead-lead collisions with the ATLAS detector. Phys. Rev. C Nucl. Phys. 2012;86(1):014907-1-014907-41.
http://dx.doi.org/10.1103/PhysRevC.86.014907