Impact of multiplicity fluctuations on entropy scaling across system size

P. Carzon, M. Sievert, J. Noronha-Hostler

Research output: Contribution to journalArticlepeer-review


The initial state is one of the greatest uncertainties in heavy-ion collisions. A model-agnostic approach is taken in the phenomenological Trento framework which constrains parameters using Bayesian analysis. However, the color-glass condensate (CGC) effective theory predicts initial energy densities that lie outside the recent Bayesian analyses due, in part, to the assumption in Trento of event-by-event multiplicity fluctuations following a Γ distribution. We compare the Trento-preferred TATB scaling to CGC-like TATB scaling coupled with log-normal fluctuations in AuAu and dAu collisions and find there is a significant impact on the multiplicity distributions and on the eccentricities, which may affect the extraction of viscosity in small systems.

Original languageEnglish (US)
Article number014913
JournalPhysical Review C
Issue number1
StatePublished - Jan 2022

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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