Investigating QCD Dynamical Entropy in high-energy nuclear collisions

2025/07/12 by G. S. Ramos, Ramos, G. S., L. S. Moriggi +3 · 5 citations
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2507.09349

openalex publication_date 2025/07/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In this work, the concept of QCD dynamical entropy is extended to heavy ion systems. This notion of entropy can be understood as a relative entropy and can also be used to estimate the initial entropy density in ultra-relativistic heavy ion collisions. The key quantity used to calculate this entropy is the nuclear unintegrated gluon distribution (nUGD), which provides a transverse momentum probability density. In the numerical analysis, both the geometric scaling phenomenon and the Glauber-Gribov approach have been used to evaluate realistic models for the nUGD. It is shown that the normalization procedure and the geometric scaling property make the dynamical entropy almost independent of the nucleus mass number A. Results are presented for the dynamical entropy density, dS_D/dy, in terms of the rapidity.

Citations

• A Simple Approximation Method for the Fisher–Rao Distance between Multivariate Normal Distributions
• Measurement of charged particle multiplicity distributions in DIS at HERA and its implication to entanglement entropy of partons

Cited by

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• KNO scaling, memorylessness and maximal entanglement at universal fixed point
• Entropy, purity and gluon cascades at high energies with recombinations and transitions to vacuum
• Pomeron evolution, entanglement entropy and Abramovskii-Gribov-Kancheli cutting rules

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