Energy and system-size dependence of two- and four-particle<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>v</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>measurements in heavy-ion collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>62.4</mml:mn></mml:mrow></mml:math>and 200

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doi:10.1103/physrevc.86.014904

Cited by 46 publications

(23 citation statements)

References 90 publications

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“…A similar observation is reported by the CMS Collaboration [16]. The trend for R 2 in Pb-Pb is similar to observations for Au-Au √ s NN = 200 GeV collisions [38,42]. The value of R 2 in midcentral (midmultiplicity) Pb-Pb collisions (∼0.35) is between the STAR and PHOBOS results for similar centralities.…”

Section: E Second Harmonic Flow Coefficients In P-pb and Pb-pb Collisupporting

confidence: 89%

“…Assuming the number of sources are highly correlated with the number of participants, the difference between very high multiplicity p-Pb and Pb-Pb can be explained by the larger number of sources in the latter. Finally, these results at the LHC can be compared to those from the STAR Collaboration [38,39]. In Au-Au √ s NN = 200 GeV collisions, c 2 {4} also approaches zero and may become positive which prevented the extraction of v 2 {4} in central collisions, while for U-U √ s NN = 193 GeV collisions, c 2 {4} always remains negative.…”

Section: Second Harmonic Cumulants In Very High-multiplicity Pb-pbmentioning

confidence: 98%

See 1 more Smart Citation

Multiparticle azimuthal correlations inp-Pb and Pb-Pb collisions at the CERN Large Hadron Collider

Abelev¹,

Adam²,

Adamová³

et al. 2014

Phys. Rev. C

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186

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Measurements of multiparticle azimuthal correlations (cumulants) for charged particles in p-Pb at √ s NN = 5.02 TeV and Pb-Pb at √ s NN = 2.76 TeV collisions are presented. They help address the question of whether there is evidence for global, flowlike, azimuthal correlations in the p-Pb system. Comparisons are made to measurements from the larger Pb-Pb system, where such evidence is established. In particular, the second harmonic two-particle cumulants are found to decrease with multiplicity, characteristic of a dominance of few-particle correlations in p-Pb collisions. However, when a | η| gap is placed to suppress such correlations, the two-particle cumulants begin to rise at high multiplicity, indicating the presence of global azimuthal correlations. The Pb-Pb values are higher than the p-Pb values at similar multiplicities. In both systems, the second harmonic four-particle cumulants exhibit a transition from positive to negative values when the multiplicity increases. The negative values allow for a measurement of v 2 {4} to be made, which is found to be higher in Pb-Pb collisions at similar multiplicities. The second harmonic six-particle cumulants are also found to be higher in Pb-Pb collisions.In Pb-Pb collisions, we generally find v 2 {4} v 2 {6} = 0 which is indicative of a Bessel-Gaussian function for the v 2 distribution. For very high-multiplicity Pb-Pb collisions, we observe that the four-and six-particle cumulants become consistent with 0. Finally, third harmonic two-particle cumulants in p-Pb and Pb-Pb are measured. These are found to be similar for overlapping multiplicities, when a | η| > 1.4 gap is placed.

show abstract

Section: E Second Harmonic Flow Coefficients In P-pb and Pb-pb Collisupporting

confidence: 89%

Section: Second Harmonic Cumulants In Very High-multiplicity Pb-pbmentioning

confidence: 98%

Multiparticle azimuthal correlations inp-Pb and Pb-Pb collisions at the CERN Large Hadron Collider

Abelev¹,

Adam²,

Adamová³

et al. 2014

Phys. Rev. C

Self Cite

186

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show abstract

“…For each centrality bin, the number of participants and binary collisions can be found in Table III of Ref. [26].…”

Section: Methodsmentioning

confidence: 99%

Third harmonic flow of charged particles in Au+Au collisions atsNN=200 GeV

Adamczyk¹,

Adkins²,

Agakishiev³

et al. 2013

Phys. Rev. C

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131

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We report measurements of the third harmonic coefficient of the azimuthal anisotropy, v 3 , known as triangular flow. The analysis is for charged particles in Au + Au collisions at √ s NN = 200 GeV, based on data from the STAR experiment at the BNL Relativistic Heavy Ion Collider. Two-particle correlations as a function of their pseudorapidity separation are fit with narrow and wide Gaussians. Measurements of triangular flow are extracted from the wide Gaussian, from two-particle cumulants with a pseudorapidity gap, and also from event plane analysis methods with a large pseudorapidity gap between the particles and the event plane. These results are 014904-2 THIRD HARMONIC FLOW OF CHARGED PARTICLES IN . . . 88, 014904 (2013) reported as a function of transverse momentum and centrality. A large dependence on the pseudorapidity gap is found. Results are compared with other experiments and model calculations. PHYSICAL REVIEW C

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“…It is known that the magnitude of anisotropic flow, being approximately proportional to the initial-state spatial anisotropy [20], fluctuates from collision to collision even for fixed centrality [6,[21][22][23][24], and that its probability distribution function (p.d.f.) P (v n ) is to a first approximation Bessel-Gaussian [1,25], i.e.…”

Section: Jhep07(2018)103mentioning

confidence: 99%

Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV

Acharya

Acosta

Adamová

et al. 2018

J. High Energ. Phys.

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Measurements of anisotropic flow coefficients with two-and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at √ s NN = 5.02 and 2.76 TeV are reported in the pseudorapidity range |η| < 0.8 and transverse momentum 0.2 < p T < 50 GeV/c. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) µb −1 in the centrality range 0-80%, is analysed. Flow coefficients up to the sixth flow harmonic (v 6 ) are reported and a detailed comparison among results at the two energies is carried out. The p T dependence of anisotropic flow coefficients and its evolution with respect to centrality and harmonic number n are investigated. An approximate power-law scaling of the form v n (p T ) ∼ p n/3 T is observed for all flow harmonics at low p T (0.2 < p T < 3 GeV/c). At the same time, the ratios v n /v n/m m are observed to be essentially independent of p T for most centralities up to about p T = 10 GeV/c. Analysing the differences among higher-order cumulants of elliptic flow (v 2 ), which have different sensitivities to flow fluctuations, a measurement of the standardised skewness of the event-by-event v 2 distribution P (v 2 ) is reported and constraints on its higher moments are provided. The Elliptic Power distribution is used to parametrise P (v 2 ), extracting its parameters from fits to cumulants. The measurements are compared to different model predictions in order to discriminate among initial-state models and to constrain the temperature dependence of the shear viscosity to entropy-density ratio.

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Energy and system-size dependence of two- and four-particlev2measurements in heavy-ion collisions atsNN=62.4and 200

Cited by 46 publications

References 90 publications

Multiparticle azimuthal correlations inp-Pb and Pb-Pb collisions at the CERN Large Hadron Collider

Multiparticle azimuthal correlations inp-Pb and Pb-Pb collisions at the CERN Large Hadron Collider

Third harmonic flow of charged particles in Au+Au collisions atsNN=200 GeV

Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV

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