A unified description of the reaction dynamics from pp to pA to AA collisions

Werner, K.; Guiot, B.; Karpenko, Iu.; Pierog, T.

doi:10.1016/j.nuclphysa.2014.08.093

Cited by 25 publications

(10 citation statements)

References 34 publications

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“…Starting from the initial proper time τ 0 , the core part of the system evolves according to the equations of relativistic viscous hydrodynamics [1,4], where we use presently η/s = 0.08. A cross-over equation-of-state is used, compatible with lattice QCD [5,6].…”

Section: Viscous Hydrodynamic Expansionmentioning

confidence: 99%

“…Our tool to analyse particle production is the EPOS model. EPOS3 [1] is a universal model in the sense that for pp, pA, and AA collisions, the same procedure applies, based on several elements: Initial state. A Gribov-Regge multiple scattering approach is employed ("Parton-Based GribovRegge Theory" PBGRT [2]), where the elementary object (by definition called Pomeron) is a DGLAP parton ladder.…”

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confidence: 99%

“…Based on the momenta and the density of string segments, one separates at some early proper time τ 0 the core (going to be treated as fluid) from the corona (escaping hadrons, including jet hadrons). The corecorona procedure has been first described in [3], a more recent discussion is found in [1]. The corresponding energy-momentum tensor of the core part is transformed into an equilibrium one, needed to start the hydrodynamical evolution.…”

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confidence: 99%

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Resonance production in high energy collisions from small to big systems

et al. 2018

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Abstract. The aim of this paper is to understand resonance production (and more generally particle production) for different collision systems, namely proton-proton (pp), proton-nucleus (pA), and nucleus-nucleus (AA) scattering at the LHC. We will investigate in particular particle yields and ratios versus multiplicity, using the same multiplicity definition for the three different systems, in order to analyse in a compact way the evolution of particle production with the system size and the origin of a very different system size dependence of the different particles.The main goal of heavy ion physics at very high energies is the proof of existence of the creation of a quark-gluon plasma, and the study of the properties of this exotic state, by analysing the final state of many thousands of produced hadrons. Unfortunately, many of these final state particles are not directly coming from the decay of the plasma, but they are produced or at least affected by the hadronic cascade, the last stage of the collision before particles freeze out and freely move to the detectors. Here resonance studies come into play : There is a large number of resonances at our disposal, having very different lifetimes, from 1 fm/c to several tens of fm/c, which means that these particles decay with varying probabilities in the hadronic stage, and provide therefore valuable information about the latter one.We extended this analysis, to also consider small collision systems (pp and pA), in addition to AA. We also consider not only resonances, but also stable particles, providing useful additional information (the lifetime is not the only relevant parameter). Our tool to analyse particle production is the EPOS model. EPOS3 [1] is a universal model in the sense that for pp, pA, and AA collisions, the same procedure applies, based on several elements:

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Section: Viscous Hydrodynamic Expansionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Resonance production in high energy collisions from small to big systems

et al. 2018

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“…The observation of long range rapidity correlations, the so called "ridge", similar to that seen in heavy ion collisions in high multiplicity pp collisions at √ s= 7 TeV by the CMS experiment suggests the evidence of strong radial flow [6,7]. There are several theoretical papers which support the view that QGP can be formed in high multiplicity pp events [8,9,10].…”

Section: Introductionmentioning

confidence: 94%

De-confinement in small systems: Clustering of color sources in high multiplicity p̄p collisions at s = 1.8TeV

Gutay

Hirsch

Scharenberg

et al. 2015

Int. J. Mod. Phys. E

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It is shown that de-confinement can be achieved in high multiplicity non jetpp collisions at √ s= 1.8 TeV Fermi National Accelerator Laboratory(FNAL-E735) experiment. Previously the evidence for deconfinement was the demonstrated by the constant freeze out energy density in high multiplicity events. In this paper we use the same data but analyze the transverse momentum spectrum in the framework of the clustering of color sources. The charged particle pseudorapidities densities in the range 7.0 ≤ dN c /dη ≤26.0 are considered. Results are presented for both thermodynamic and transport properties. The initial temperature and energy density are obtained and compared with the Lattice Quantum Chromo Dynamics(LQCD) simulations. The energy density (ε/T 4 ) ∼ 11.5 for dN c /dη ∼ 25.0 is close to the value for 0-10% central events in Au+Au collisions at √ s N N = 200 GeV. The shear viscosity to entropy density ratio(η/s) is ∼ 0.2 at the transition temperature. The result for the trace anomaly ∆ is in excellent agreement with LQCD simulations. These results confirm our earlier observation that the de-confined state of matter was created in high multiplicity events inpp collisions at √ s=1.8 TeV.

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“…The similar trends of charm (open and hidden) and beauty suggest that their multiplicity dependence is not, or only slightly, affected by the hadronisation stage. The yield increase can be described by calculations taking into account the influence of the interactions between colour sources in the percolation model [12], and the contribution of MPI, through the PYTHIA-8 [13] and the EPOS 3 event generators [14], that also include the effect of the initial conditions of the collision followed by a hydrodynamic evolution. However more precise measurements are needed for a conclusive discrimination of the possible origins of the effect.…”

Section: D-meson Production In Pp Collisionsmentioning

confidence: 99%

D-meson production in pp and p-Pb collisions measured with ALICE at the LHC

Terrevoli

2016

J. Phys.: Conf. Ser.

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Abstract. The open heavy-flavour production studied with ALICE at the LHC in pp collisions at √ s = 7 TeV and p-Pb collisions at √ sNN = 5.02 TeV is presented. Focus is given to the dependence of the production on the multiplicity of charged particles produced in the collision. IntroductionHeavy quarks (charm and beauty) can be used to study several aspects of QCD in high-energy hadronic collisions. They are produced in hard partonic scattering processes occurring in the initial stage of the collisions with large momentum transfer. Therefore, the study of their production in pp collisions provides a precision test of perturbative QCD (pQCD) calculations. In proton-nucleus collisions, heavy-flavour production could be modified by the presence of a nucleus in the colliding system. The cross section and p T distributions of heavy-flavour hadrons could be influenced by the modification of the parton distributions functions in the nucleus (nPDF), especially at small Bjorken x (see e.g.[1]), by the k T -broadening caused by soft scatterings of the partons in the incoming nucleus [2], and by possible energy loss of the produced heavy quarks in the nucleus [3]. These effects are commonly called Cold Nuclear Matter (CNM) effects. They are explored through the measurement of the nuclear modification factor R pPb , i.e. the comparison of p-Pb measurements with pp results, to test whether the yield and the transverse momentum distributions follow or not a scaling with the number of binary nucleon-nucleon collisions in p-Pb collisions. The study of the nuclear modification factor in different event multiplicity classes is also interesting to assess the possible modification of the p T spectrum in high multiplicity events. Moreover, the measurement of heavy-flavour production, both in pp and p-Pb collisions, as a function of the multiplicity of charged particles produced in hadronic collisions can improve our understanding of their production mechanisms and could give insight into the role of MultiParton Interactions (MPI), i.e. several partonic interactions occurring in a single collision between two nucleons. If the production of heavy quarks is affected by the presence of additional hard scatterings between incoming partons, their yield should increase with multiplicity. The shape of the increasing trend depends on how the MPI contribute to the production of particles: if they equally contribute to soft and hard production, from small to large multiplicities, the increase would be linear. Indications of the relevance of MPI in heavy-quark production have been observed by NA27 [4] and recently by ALICE in the J/ψ and D-meson production measurement as a function of charged-particle multiplicity [5,6].

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A unified description of the reaction dynamics from pp to pA to AA collisions

Cited by 25 publications

References 34 publications

Resonance production in high energy collisions from small to big systems

Resonance production in high energy collisions from small to big systems

De-confinement in small systems: Clustering of color sources in high multiplicity p̄p collisions at s = 1.8TeV

D-meson production in pp and p-Pb collisions measured with ALICE at the LHC

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