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Statistical analysis of initial state and final state response in heavy-ion collisions

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arxiv 2209.01176 v2 pith:NQ4KWVZZ submitted 2022-09-02 hep-ph nucl-th

Statistical analysis of initial state and final state response in heavy-ion collisions

classification hep-ph nucl-th
keywords stateinitialmodesdifferentbasisdecompositionevent-by-eventfluctuations
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We develop a general decomposition of an ensemble of initial density profiles in terms of an average state and a basis of modes that represent the event-by-event fluctuations of the initial state. The basis is determined such that the probability distributions of the amplitudes of different modes are uncorrelated. Based on this decomposition, we quantify the different types and probabilities of event-by-event fluctuations in Glauber and Saturation models and investigate how the various modes affect different characteristics of the initial state. We perform simulations of the dynamical evolution with KoMPoST and MUSIC to investigate the impact of the modes on final-state observables and their correlations.

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Cited by 4 Pith papers

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  1. Event-by-event fluctuations of elliptic flow in ultrarelativistic O+O collisions

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    In O+O collisions, initial eccentricity and elliptic flow are fluctuation-driven and can be reproduced from a small set of uncorrelated modes.

  2. The size of the quark-gluon plasma in ultracentral collisions: impact of initial density fluctuations on the average transverse momentum

    nucl-th 2025-11 unverdicted novelty 5.0

    Volume variation with multiplicity in ultracentral collisions is small when total entropy scales with nuclear mass number, as shown by relating it to initial density fluctuation profiles.

  3. Extended applicability domain of viscous anisotropic hydrodynamics in (2+1)-D Bjorken flow with transverse expansion

    nucl-th 2025-09 unverdicted novelty 5.0

    VAH simulations in (2+1)D Bjorken flow with transverse expansion show an extended applicability domain over standard viscous hydrodynamics when compared to relaxation-time approximation kinetic theory.

  4. Constraining hot and cold nuclear matter properties from heavy-ion collisions and deep-inelastic scattering

    nucl-th 2025-04 unverdicted novelty 5.0

    Global analysis of HERA DIS and ALICE Pb+Pb data using saturation initial-state model determines early-time non-equilibrium η/s of QGP.