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Higher order cumulants of transverse momentum and harmonic flow in relativistic heavy ion collisions

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arxiv 2103.15338 v2 pith:PS7RKTH6 submitted 2021-03-29 nucl-th nucl-ex

Piotr Bozek , Rupam Samanta This is my paper · ORCID
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keywords cumulantsflowharmonicmomentumobservablesordersymmetrictransverse
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Higher order symmetric cumulants of global collective observables in heavy ion collisions are studied. The symmetric cumulants can be straightforwardly constructed for scalar observables: the average transverse momentum, the multiplicity, and the squares of harmonic flow vectors. Third and fourth order cumulants are calculated in the hydrodynamic model. A linear predictor of the average transverse momentum and harmonic flow coefficients in a collision is used to predict the value of the cumulants from the moments of the initial distribution. The symmetric cumulants divided by the averages (or the standard deviations) of the considered observables can be used as a fine tool to study correlations present in the initial state of the collision.

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  1. Thermal and geometric normal modes of spectral fluctuations in heavy-ion collisions

    nucl-th 2026-04 unverdicted novelty 7.0 of 10

    Rotated PCA of simulated Pb+Pb spectra separates spectral fluctuations into a coherent thermal mode that fully explains v0(pT) and a double-node geometric mode that drives the low-pT sign change of v02(pT).

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