Flow and correlation phenomena measurements in pp, pPb and PbPb collisions at CMS

Padula, Sandra S.

doi:10.1051/epjconf/201817205005

Cited by 1 publication

(2 citation statements)

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“…The results of lepton-hadron and lepton-nucleus interactions thus will define very clearly the particle physics background to possible collective effects. For example, recently azimuthal correlations were observed in high multiplicity p+p and p+A as well as in heavy ion reactions (the ridge effect [39,40]), whose origin is currently not entirely clear. If such a ridge effect appears also in e+p and e+A collisions, then most likely this effect is not of a hydrodynamical origin, while if it does not appear in e+p and e+A collisions in the same multiplicity range as in p+p and p+A reactions, than the ridge is more likely a hydrodynamical effect.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, Shuryak and Zahed proposed [38] the application of hydrodynamics for high multiplicity p+p and p+A collisions at CERN LHC. The ridge effect [39,40], i.e. long range azimuthal correlations were observed in high multiplicity p+p and p+A as well as in heavy ion reactions, which also points towards similarities in collectivity, and perhaps the applicability of hydrodynamics can be extended to these systems.…”

Section: Introductionmentioning

confidence: 88%

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Initial Energy Density of √s = 7 and 8 TeV p–p Collisions at the LHC

et al. 2017

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Abstract:Results from the Relativistic Heavy Ion Colloder (RHIC) and the Large Hadron Collider (LHC) experiments show that in relativistic heavy ion collisions, a new state of matter, a strongly interacting perfect fluid, is created. Accelerating, exact and explicit solutions of relativistic hydrodynamics allow for a simple and natural description of this medium. A finite rapidity distribution arises from these solutions, leading to an advanced estimate of the initial energy density of high energy collisions. These solutions can be utilized to describe various aspects of proton-proton collisions, as originally suggested by Landau. We show that an advanced estimate based on hydrodynamics yields an initial energy density in √ s = 7 and 8 TeV proton-proton (p-p) collisions at the LHC on the same order as the critical energy density from lattice Quantum Chromodynamics (QCD). The advanced estimate yields a corresponding initial temperature that is around the critical temperature from QCD and the Hagedorn temperature. The multiplicity dependence of the estimated initial energy density suggests that in high multiplicity p-p collisions at the LHC, there is large enough initial energy density to create a non-hadronic perfect fluid.

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Section: Discussionmentioning

confidence: 99%