Title: Impact of multiplicity fluctuations on entropy scaling across system size

Journal Article · · Physical Review. C
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); OSTI
  2. New Mexico State Univ., Las Cruces, NM (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States)

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.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0020633
OSTI ID:
1979856
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 105; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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