Collective dynamics in high-energy proton-nucleus collisions

Božek, Piotr; Broniowski, Wojciech

doi:10.1103/physrevc.88.014903

Cited by 254 publications

(221 citation statements)

References 112 publications

Supporting

Mentioning

210

Contrasting

Unclassified

Order By: Relevance

“…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.…”

mentioning

confidence: 71%

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

2014

View full text Add to dashboard Cite

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...

show abstract

mentioning

confidence: 71%

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

2014

View full text Add to dashboard Cite

show abstract

“…20 by the CMS collaboration correlations the two-particle correlations show surprisingly similar correlation structures in peripheral heavy ion and elementary p-Pb collisions. At the moment, there are two main explanations, either the correlations are generated directly in the initial state, e.g., by early gluon dynamics in a saturation picture [168,169], or the correlations are generated by collective expansion, e.g., hydrodynamics [170,171,172,173,174]. Since p-Pb and p-p collisions are used as a reference for many hard observables it is important to understand them in more detail.…”

Section: Other Systemsmentioning

confidence: 99%

Initial state fluctuations and final state correlations in relativistic heavy-ion collisions

Luzum

Petersen

2014

J. Phys. G: Nucl. Part. Phys.

187

185

View full text Add to dashboard Cite

Abstract. We review the phenomenology and theory of bulk observables in ultrarelativistic heavy-ion collisions, focussing on recent developments involving event-byevent fluctuations in the initial stages of a heavy ion collision, and how they manifest in observed correlations. We first define the relevant observables and show how each measurement is related to underlying theoretical quantities. Then we review the prevailing picture of the various stages of a collision, including the state-of-the-art modeling of the initial stages of a collision and subsequent hydrodynamic evolution, as well as hadronic scattering and freeze-out in the later stages. We then discuss the recent results that have shaped our current understanding and identify the challenges that remain. Finally, we point out open issues and the potential for progress in the field.PACS numbers: 25.75.Ag,24

show abstract

“…Hydrodynamic models can describe the observed correlations in p+Pb [7][8][9], but the extent to which they are appropriate in "small" systems remains an open question.…”

Section: Introductionmentioning

confidence: 99%

Femtoscopy in √S_NN= 5.02 TeVp-Pb collisions withATLAS

Clark

2017

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. Bose-Einstein correlations between identified charged pions are measured for p+Pb collisions at √ s NN = 5.02 TeV with the ATLAS detector using a total integrated luminosity of 28 nb −1 . Pions are identified using ionisation energy loss measured in the pixel detector. Two-particle correlation functions and the extracted source radii are presented as a function of average transverse pair momentum (k T ) and rapidity (y ππ ) as well as collision centrality. Pairs are selected with a rapidity −2 < y ππ < 1 and with an average transverse momentum 0.1 < k T < 0.8 GeV. The effect on the two-particle correlation function from jet fragmentation is studied, and a new method for constraining its contributions to the measured correlations is described. The measured source sizes are substantially larger in more central collisions and are observed to decrease with increasing pair k T . A correlation with the local single-particle multiplicity dN ch /dy is demonstrated. The scaling of the extracted radii with the mean number of participants is also used to compare a selection of initial-geometry models. The cross term R ol , which couples radial and longitudinal expansion, is measured as a function of rapidity, and a departure from zero is observed with 4.8 σ combined significance for y ππ > −1 in the most central events.

show abstract

Collective dynamics in high-energy proton-nucleus collisions

Cited by 254 publications

References 112 publications

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

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

Initial state fluctuations and final state correlations in relativistic heavy-ion collisions

Femtoscopy in √S_NN= 5.02 TeVp-Pb collisions withATLAS

Contact Info

Product

Resources

About

Collective dynamics in high-energy proton-nucleus collisions

Cited by 254 publications

References 112 publications

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

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

Initial state fluctuations and final state correlations in relativistic heavy-ion collisions

Femtoscopy in √SNN= 5.02 TeVp-Pb collisions withATLAS

Contact Info

Product

Resources

About

Femtoscopy in √S_NN= 5.02 TeVp-Pb collisions withATLAS