Scaling relation between<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mi>A</mml:mi></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:mi>A</mml:mi></mml:mrow></mml:math>collisions

Başar, Gökçe; Teaney, Derek

doi:10.1103/physrevc.90.054903

Cited by 34 publications

(33 citation statements)

References 36 publications

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“…Similar observation has been made in Cu+Cu, Au+Au and U+U collisions at RHIC [42], and in p+Pb and peripheral Pb+Pb collisions at the LHC [43,44]. Based on an independent source picture and a simple conformal scaling argument [45], this scaling behavior is expected since ε 3 is driven by random fluctuations of the positions of participating nucleons. The v 3 {PP} values show a similar ⟨N ch ⟩ dependence as symmetric systems, except for d+Au which deviates from the common trend at large ⟨N ch ⟩.…”

supporting

confidence: 79%

Disentangling contributions to small-system collectivity via scans of light nucleus-nucleus collisions

Huang¹,

Chen²,

Li³

et al. 2020

Phys. Rev. C

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The observation of multi-particle azimuthal correlations in high-energy small-system collisions has led to intense debate on its origin and the possible coexistence from two competing theoretical scenarios: one based on initial-state intrinsic momentum anisotropy (ISM), and the other based on final-state collective response to the collision geometry (FSM). To complement the previous scan of asymmetric collision systems (p+Au, d+Au and He+Au), we propose a scan of small symmetric collision systems at RHIC, such as C+C, O+O, Al+Al and Ar+Ar √ s NN = 0.2 TeV, to provide further insights in disentangling contributions from these two scenarios. These symmetric small systems have the advantage of providing a better controlled initial geometry dominated by the average shape of the overlap region, as opposed to fluctuation-driven geometries in asymmetric systems. A transport model is employed to investigate the expected geometry response in the FSM scenario. Different trends of elliptic flow with increasing charge particle multiplicity are observed between symmetric and asymmetric systems, while triangular flow appears to show a similar behavior. Furthermore, a comparison of O+O collisions at √ s NN = 0.2 TeV and at √ s NN = 2.76 − 7 TeV, as proposed at the LHC, provides a unique opportunity to disentangle the collision geometry effects at nucleon level from those arising from subnucleon fluctuations.

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supporting

confidence: 79%

Disentangling contributions to small-system collectivity via scans of light nucleus-nucleus collisions

Huang¹,

Chen²,

Li³

et al. 2020

Phys. Rev. C

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“…Indeed, an alternative explanation for the modulation using perturbative QCD and assuming saturated parton distributions in the lead nucleus is capable of reproducing many features of the p + Pb data [20][21][22][23][24][25][26][27][28][29]. Nonetheless, because of the many similarities between the p + Pb and Pb + Pb observations, extensive theoretical and experimental effort has been devoted to address the question of whether the strong-coupling physics understood to be responsible for the collective dynamics in A + A collisions may persist in smaller systems [30][31][32][33][34][35][36][37][38][39][40].…”

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for pp collisions at s=5.02 and 13 TeV and p
Aaboud
¹
,
Bergeås
²
,
Brenner
³

et al. 2017
Phys. Rev. C
78
4
78
0
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Measurements of long-range azimuthal anisotropies and associated Fourier coefficients forATLAS measurements of two-particle correlations are presented for √ s = 5.02 and 13 TeV pp collisions and for √ s NN = 5.02 TeV p + Pb collisions at the LHC. The correlation functions are measured as a function of relative azimuthal angle φ, and pseudorapidity separation η, using charged particles detected within the pseudorapidity interval |η| < 2.5. Azimuthal modulation in the long-range component of the correlation function, with | η| > 2, is studied using a template fitting procedure to remove a "back-to-back" contribution to the correlation function that primarily arises from hard-scattering processes. In addition to the elliptic, cos(2 φ), modulation observed in a previous measurement, the pp correlation functions exhibit significant cos(3 φ) and cos(4 φ) modulation. The Fourier coefficients v n,n associated with the cos(n φ) modulation of the correlation functions for n = 2-4 are measured as a function of charged-particle multiplicity and charged-particle transverse momentum. The Fourier coefficients are observed to be compatible with cos(nφ) modulation of per-event singleparticle azimuthal angle distributions. The single-particle Fourier coefficients v n are measured as a function of charged-particle multiplicity, and charged-particle transverse momentum for n = 2-4. The integrated luminosities used in this analysis are, 64 nb −1 for the √ s = 13 TeV pp data, 170 nb −1 for the √ s = 5.02 TeV pp data, and 28 nb −1 for the √ s NN = 5.02 TeV p + Pb data.

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“…To this end several interesting observations were recently published [28][29][30][31][32][33][34][35] which could help to distinguish between competing models of p+A interactions. A simple conformal scaling argument, presented in Ref.…”

mentioning

confidence: 99%

Elliptic and Triangular Flow inp-Pb and Peripheral Pb-Pb Collisions from Parton Scatterings

2014

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Using a multiphase transport model (AMPT) we calculate the elliptic, v2, and triangular, v3, Fourier coefficients of the two-particle azimuthal correlation function in proton-nucleus (p+Pb) and peripheral nucleus-nucleus (Pb+Pb) collisions. Our results for v3 are in a good agreement with the CMS data collected at the Large Hadron Collider. The v2 coefficient is very well described in p+Pb collisions and is underestimated for higher transverse momenta in Pb+Pb interactions. The characteristic mass ordering of v2 in p+Pb is reproduced whereas for v3 this effect is not observed. We further predict the pseudorapidity dependence of v2 and v3 in p+Pb and observe that both are increasing when going from a proton side to a Pb-nucleus side. Predictions for the higher order Fourier coefficients, v4 and v5, in p+Pb are also presented. , with a modest elastic parton-parton crosssection σ = 1.5 − 3 mb, allows to understand qualitatively and quantitatively the long-range two-particle azimuthal correlation functions in proton-lead (p+Pb) and high-multiplicity proton-proton (p+p) collisions. Such correlations were recently observed by the CMS [3-5], ALICE [6,7] and ATLAS [8,9] Collaborations at the Large Hadron Collider (LHC), and by the PHENIX Collaboration in deuteron-gold collisions at the Relativistic Heavy Ion Collider (RHIC) [10].Interestingly all features of the two-particle azimuthal correlation function observed in p+Pb collisions are very similar to those observed in A+A interactions, where such correlations are commonly attributed to the hydrodynamic expansion of the produced fireball. This naturally suggests that collective physics is present in p+A collisions [1,[11][12][13][14][15][16][17]. Particularly strong evidence in favour of hydrodynamics (or any other approach where the initial coordinate space anisotropy is transformed into the final momentum anisotropy) in p+A and peripheral A+A collisions is an approximate equality of multiparticle elliptic flow cumulants, v 2 {4} ≈ v 2 {6} ≈ v 2 {8}, as predicted in Ref. [18], see also [19,20], and confirmed recently by the CMS Collaboration [21]. Other strong evidence is the characteristic mass ordering of the elliptic flow, v 2 , observed by the ALICE Collaboration in Ref. [7], and successfully reproduced by hydrodynamic calculations [22,23].The experimental data for the two-particle azimuthal correlation function can be also fitted within the color glass condensate framework [24], where the interesting part of the two-particle correlation function comes from the emission of two gluons in the so-called glasma diagram [25]. For a detailed discussion of this approach we refer the reader to Refs. [25][26][27].It is important to clarify whether the signal in p+A collisions comes form the initial or final (or both) state effects. To this end several interesting observations were recently published [28][29][30][31][32][33][34][35] which could help to distinguish between competing models of p+A interactions. A simple conformal scaling argument, presented in Ref.[31], indica...

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Scaling relation betweenpAandAAcollisions

Cited by 34 publications

References 36 publications

Disentangling contributions to small-system collectivity via scans of light nucleus-nucleus collisions

Disentangling contributions to small-system collectivity via scans of light nucleus-nucleus collisions

Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for pp collisions at s=5.02 and 13 TeV and p
Aaboud
¹
,
Bergeås
²
,
Brenner
³

et al. 2017
Phys. Rev. C
78
4
78
0
View full text Add to dashboard Cite

Elliptic and Triangular Flow inp-Pb and Peripheral Pb-Pb Collisions from Parton Scatterings

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Scaling relation betweenpAandAAcollisions

Cited by 34 publications

References 36 publications

Disentangling contributions to small-system collectivity via scans of light nucleus-nucleus collisions

Disentangling contributions to small-system collectivity via scans of light nucleus-nucleus collisions

Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for pp collisions at s=5.02 and 13 TeV and pAaboud1, Bergeås2, Brenner3 et al. 2017Phys. Rev. C784780View full textAdd to dashboardCite

Elliptic and Triangular Flow inp-Pb and Peripheral Pb-Pb Collisions from Parton Scatterings

Contact Info

Product

Resources

About

Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for pp collisions at s=5.02 and 13 TeV and p
Aaboud
¹
,
Bergeås
²
,
Brenner
³

et al. 2017
Phys. Rev. C
78
4
78
0
View full text Add to dashboard Cite