Collective dynamics in high-energy proton-nucleus collisions

By Piotr Bozek, Wojciech Broniowski. 2013

211 citations recorded by the source corpus.

We analyze the proton-lead collisions at the CERN Large Hadron Collider energy of sNN=5.02 TeV in the three-stage approach, previously used to successfully describe the relativistic A-A collisions. The approach consists of the early phase, modeled with the Glauber model, the event-by-event viscous 3+1 dimensional (3+1 D) relativistic hydrodynamics, and the statistical hadronization at freeze-out. We show that features typical of collective dynamics, such as the harmonic flow and the ridge structures in the two-particle correlations in relative azimuth and pseudorapidity, may be naturally explained in our framework. In the proton-nucleus system the harmonic flow is generated from an initially event-by-event deformed system and is entirely due to these initial fluctuations. Notably, fluctuations of strength of the initial Glauber sources which yield the observed distribution of hadron multiplicities and, at the same time, lead to correct values of the elliptic flow coefficients both from the two- and four-particle cumulant method, as measured by the ATLAS collaboration. The azimuthally asymmetric flow is not modified significantly when changing the viscosity coefficient, the initial time for the collective expansion, or the initial size of the fireball. The results present an estimate of the collective component in the two-particle correlations measured experimentally. We demonstrate that the harmonic flow coefficients can be experimentally measured with methods based on large rapidity gaps which reduce some of the other sources of correlations.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/7d12f0574af5b369e289271636ec9a1eef94e9c0

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In Nuclear and High Energy Physics

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The iEBE-VISHNU code package for relativistic heavy-ion collisions (2014, methodology): “red with the CMS measurement in left panel of Fig. 5. The MC-Glauber model with collision-by-collision multiplicity ﬂuctuations can reproduce the shape of the measured p+Pb multiplicity distributions [55]. By comparing with the distribution of initial total entropy values we ﬁnd that the broadening ”