Abstract
Ultra-relativistic heavy-ion collisions at energies of RHIC and LHC are con- sidered. For comparison with data the HYDJET++ model, which contains the treatment of both soft and hard processes, is employed. The study focuses mainly on the interplay of ideal hydrodynamics, final state interactions and jets, and its influence on the devel- opment of harmonics of the anisotropic flow. It is shown that jets are responsible for violation of the number-of-constituent-quark (NCQ) scaling at LHC energies. The inter- play between elliptic and triangular flows and their contribution to higher flow harmonics and dihadron angular correlations, including ridge, is also discussed.
Highlights
Heavy-ion collisions at ultra-relativistic energies, accessible for modern colliders such as RelativisticHeavy Ion Collider (RHIC) at BNL and Large Hadron Collider (LHC) at CERN, revealed several signals which favored the creation of a new state of matter - quark-gluon plasma (QGP) - during the earlier phase of the collision
If the elliptic flow v2 and the transverse kinetic energy KET = mT − m0 are divided by a number of constituent quarks nq, 2 for mesons and 3 for baryons, the distributions v2/nq(KET/nq) for all hadrons coincide with good accuracy up to KET/nq ≈ 1 GeV
We show the importance of final state interactions and jets for the correct treatment of anisotropic flow harmonics in heavy-ion collisions at ultrarelativistic energies within the ideal hydrodynamic model
Summary
Heavy-ion collisions at ultra-relativistic energies, accessible for modern colliders such as Relativistic. At higher transverse momenta heavier hadrons possess larger v2 Another interesting feature of elliptic flow which was considered as a “smoking gun" revealing the QGP formation is the number-of-constituent-quark (NCQ) scaling, first observed in gold-gold collisions at RHIC in [22, 23]. If the elliptic flow v2 and the transverse kinetic energy KET = mT − m0 are divided by a number of constituent quarks nq, 2 for mesons and 3 for baryons, the distributions v2/nq(KET/nq) for all hadrons coincide with good accuracy up to KET/nq ≈ 1 GeV This circumstance was taken as a strong evidence of the predominant production of elliptic flow from the q√uark coalescence at the partonic, i.e. plasma, stage. Hard pions and heavier particles have larger elliptic flow attributed to massive resonances
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