Abstract
Correlations between moments of different flow coefficients are measured in Pb–Pb collisions at sNN=5.02 TeV recorded with the ALICE detector. These new measurements are based on multiparticle mixed harmonic cumulants calculated using charged particles in the pseudorapidity region |η|<0.8 with the transverse momentum range 0.2<pT<5.0 GeV/c. The centrality dependence of correlations between two flow coefficients as well as the correlations between three flow coefficients, both in terms of their second moments, are shown. In addition, a collection of mixed harmonic cumulants involving higher moments of v2 and v3 is measured for the first time, where the characteristic signature of negative, positive and negative signs of four-, six- and eight-particle cumulants are observed, respectively. The measurements are compared to the hydrodynamic calculations using iEBE-VISHNU with AMPT and TRENTo initial conditions. It is shown that the measurements carried out using the LHC Run 2 data in 2015 have the precision to explore the details of initial-state fluctuations and probe the nonlinear hydrodynamic response of v2 and v3 to their corresponding initial anisotropy coefficients ε2 and ε3. These new studies on correlations between three flow coefficients as well as correlations between higher moments of two different flow coefficients will pave the way to tighten constraints on initial-state models and help to extract precise information on the dynamic evolution of the hot and dense matter created in heavy-ion collisions at the LHC.
Highlights
One of the fundamental questions in the phenomenology of quantum chromodynamics is what are the properties of matter at extreme densities and temperatures where quarks and gluons are in a state of matter called the quark–gluon plasma (QGP) [1,2]
The comparison of hydrodynamic calculation from the same initial state model but with different η/s values can be very useful to study the sensitivity of various nM H C to the η/s of the QGP
In central collisions, and becomes closer to n for more peripheral collisions. These measurements compared with iEBE-VISHNU hydrodynamic calculations using AMPT and TRENTo initial conditions exhibit different sensitiv
Summary
One of the fundamental questions in the phenomenology of quantum chromodynamics is what are the properties of matter at extreme densities and temperatures where quarks and gluons are in a state of matter called the quark–gluon plasma (QGP) [1,2]. High-energy heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) at BNL and the Large Hadron Collider (LHC) at CERN create such a state of strongly interacting matter allowing us to study its properties in the laboratory. Anisotropic flow is a key phenomenon that provides important information about the transport properties of the created QGP matter. Due to large pressure gradients, the anisotropy of the overlapping region between two colliding nuclei causes an anisotropic distribution of the emitted particles in the final state. This anisotropic particle distribution can be quantified by anisotropic flow [3,4] which is characterized by the single-particle azimuthal distribution, ∞.
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