002815727 001__ 2815727
002815727 003__ SzGeCERN
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002815727 0247_ $$2DOI$$9bibmatch$$a10.1103/PhysRevLett.123.262301
002815727 0248_ $$aoai:cds.cern.ch:2815727$$pcerncds:FULLTEXT$$pcerncds:CERN:FULLTEXT$$pcerncds:CERN
002815727 037__ $$9arXiv$$aarXiv:1908.02866$$chep-ph
002815727 037__ $$9arXiv:reportnumber$$aINT-PUB-19-036
002815727 035__ $$9Inspire$$aoai:inspirehep.net:1748574$$d2024-05-07T09:06:08Z$$h2024-05-08T02:01:16Z$$mmarcxml$$ttrue$$uhttps://inspirehep.net/api/oai2d
002815727 035__ $$9arXiv$$aoai:arXiv.org:1908.02866
002815727 035__ $$9Inspire$$a1748574
002815727 041__ $$aeng
002815727 100__ $$aGiacalone, [email protected]$$uIPhT, Saclay$$vInstitut für Theoretische Physik, Institut de physique théorique, Université Paris Saclay, CNRS, CEA, F-91191 Gif-sur-Yvette, France
002815727 245__ $$9arXiv$$aHydrodynamic attractors, initial state energy and particle production in relativistic nuclear collisions
002815727 269__ $$c2019-08-07
002815727 260__ $$c2019-12-31
002815727 300__ $$a7 p
002815727 500__ $$9arXiv$$a7 pages, 3 figures; v2: minor corrections, published version, plot
scripts and data shown in figures are available at
https://doi.org/10.4119/unibi/2939684 v3: included supplemental material
002815727 520__ $$9APS$$aWe exploit the concept of hydrodynamic attractors to establish a macroscopic description of the early time out-of-equilibrium dynamics of high energy heavy-ion collisions. One direct consequence is a general relation between the initial state energy and the produced particle multiplicities measured in experiments. When combined with an ab initio model of energy deposition, the entropy production during the preequilibrium phase naturally explains the universal centrality dependence of the measured charged particle yields in nucleus-nucleus collisions. Further, we estimate the energy density of the far-from-equilibrium initial state and discuss how our results can be used to constrain nonequilibrium properties of the quark-gluon plasma.
002815727 520__ $$9arXiv$$aWe exploit the concept of hydrodynamic attractors to establish a general relation between the initial state energy and the produced particle multiplicities in high-energy nuclear collisions. When combined with an ab initio model of energy deposition, the entropy production during the pre-equilibrium phase naturally explains the universal centrality dependence of the measured charged particle yields in nucleus-nucleus collisions. We further estimate the energy density of the far-from-equilibrium initial state and discuss how our results can be used to constrain non-equilibrium properties of the quark-gluon plasma.
002815727 540__ $$3preprint$$aarXiv nonexclusive-distrib 1.0$$uhttp://arxiv.org/licenses/nonexclusive-distrib/1.0/
002815727 540__ $$3publication$$aCC BY 4.0$$bAPS$$uhttps://creativecommons.org/licenses/by/4.0/
002815727 540__ $$3preprint$$aCC BY 4.0$$uhttp://creativecommons.org/licenses/by/4.0/
002815727 542__ $$3publication$$dauthors$$g2019
002815727 6531_ $$9publisher$$aNuclear Physics
002815727 65017 $$2INSPIRE$$aNuclear Physics - Experiment
002815727 65017 $$2SzGeCERN$$aParticle Physics - Phenomenology
002815727 65017 $$2SzGeCERN$$aNuclear Physics - Theory
002815727 690C_ $$aARTICLE
002815727 690C_ $$aCERN
002815727 700__ $$aMazeliauskas, [email protected]$$uHeidelberg U.$$uCERN$$vTheoretical Physics Department, CERN, CH-1211 Gen`eve 23, Switzerland and Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, D-69120 Heidelberg, Germany
002815727 700__ $$aSchlichting, Sö[email protected]$$uBielefeld U.$$vUniversität Bielefeld, D-33615 Bielefeld, Germany
002815727 773__ $$c262301$$mpublication$$n26$$pPhys. Rev. Lett.$$v123$$xPhys. Rev. Lett. 123, 262301 (2019)$$y2019
002815727 8564_ $$82379129$$s695008$$uhttp://cds.cern.ch/record/2815727/files/1908.02866.pdf$$yFulltext
002815727 8564_ $$82379130$$s486491$$uhttp://cds.cern.ch/record/2815727/files/scoap3-fulltext.pdf$$yArticle from SCOAP3
002815727 8564_ $$82379131$$s14553$$uhttp://cds.cern.ch/record/2815727/files/figure3.png$$y00002 Estimate of the initial energy per unit space-time rapidity $dE_0 /d\etas$ (shaded area) determined from the measured particle multiplicity in $\sqrt{s_\text{NN}}=200\,\text{GeV}$ Au-Au (left) and $\sqrt{s_\text{NN}}=2.76\,\text{TeV}$ Pb-Pb collisions (right). Bands correspond to variations of $\eta /s=0.08\text{--}0.24$ and $\C=0.80\text{--}1.15$ while keeping all other parameters fixed as in \Eq{eq:InitialEnergyDensity}, and similarly the dashed lines correspond to specific values of $\eta/s=0.08,0.16$. For comparison we show data points for the experimentally measured final state energy $dE_\text{final} /dy$~\cite{Adam:2016thv,Adare:2015bua}, which is smaller due to the work performed against the longitudinal expansion.
002815727 8564_ $$82379132$$s26231$$uhttp://cds.cern.ch/record/2815727/files/figure2.png$$y00001 The effect of pre-equilibrium dynamics on the centrality dependence of the charged-particle multiplicity, $dN_{\rm ch}/d\eta$, can be appreciated by comparing the theoretical estimate on the gluon number (blue dashed line), given by Eq.~(\ref{eq:woPre}), to that on the charged-particle multiplicity after equilibration (red solid line), given by Eq.~(\ref{eq:wPre}). The green dot-dashed line includes as well fluctuations in the initial state energy within a Glauber Monte Carlo approach. Experimental data points are shown for different collision systems: Xe-Xe~\cite{Acharya:2018hhy}, Pb-Pb~\cite{Aamodt:2010cz}, U-U~\cite{Adare:2015bua}, Au-Au~\cite{Alver:2010ck}, and Cu-Cu~\cite{Alver:2010ck} collisions. All curves are normalized to present the same value of multiplicity as ALICE Pb-Pb data in the 10-20\% centrality bin. The bottom panel shows the ratio between 2.76 TeV Pb-Pb data and the theory curves.
002815727 8564_ $$82379133$$s26160$$uhttp://cds.cern.ch/record/2815727/files/figure1.png$$y00000 Hydrodynamic attractor for pre-equilibrium evolution of the energy density obtained from QCD and Yang Mills (YM) kinetic theory~\cite{Kurkela:2018vqr,Kurkela:2018wud,Kurkela:2018xxd,Kurkela:2018oqw}, AdS/CFT~\cite{Heller:2011ju,Heller:2015dha,Romatschke:2017vte} and Boltzmann RTA~\cite{Heller:2016rtz,Strickland:2017kux,Blaizot:2017ucy,Strickland:2018ayk,Behtash:2019txb}. Solid lines show the asymptotic behavior of the attractor curves given by \Eq{eq:AttractorLimits}.
002815727 960__ $$a13
002815727 980__ $$aARTICLE