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Local Polarization and Isothermal Local Equilibrium in Relativistic Heavy Ion Collisions.

F Becattini1, M Buzzegoli1, A Palermo1

  • 1Università di Firenze and INFN Sezione di Firenze, Via G. Sansone 1, I-50019 Sesto Fiorentino (Florence), Italy.

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Researchers improved agreement in heavy-ion collision models by adding a new spin polarization term and assuming constant hadron production temperature. This refined model accurately predicts particle polarization at 200 GeV.

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Area of Science:

  • High-energy nuclear physics
  • Quantum chromodynamics
  • Relativistic hydrodynamics

Background:

  • Relativistic heavy-ion collisions create a hot, dense medium.
  • Measuring particle spin polarization provides insights into the medium's properties.
  • Previous hydrodynamic models had discrepancies with polarization data.

Purpose of the Study:

  • To improve the quantitative agreement between hydrodynamic models and experimental measurements of local polarization.
  • To investigate the impact of a new spin polarization term on model predictions.
  • To determine the temperature of hadron production in these collisions.

Main Methods:

  • Incorporating an additional term in the spin polarization vector, linear in symmetrized velocity gradients.
  • Assuming hadron production occurs at a constant temperature.
  • Comparing model predictions with experimental data from relativistic heavy-ion collisions at sqrt[s_{NN}]=200 GeV.

Main Results:

  • The inclusion of the new spin polarization term and the constant temperature assumption restored quantitative agreement.
  • The longitudinal component of the spin polarization vector showed high sensitivity to temperature.
  • A good fit for the temperature was found around 155 MeV.

Conclusions:

  • The refined hydrodynamic model successfully reproduces experimental polarization data.
  • The study highlights the importance of spin polarization in understanding the Quark-Gluon Plasma.
  • The determined temperature provides a crucial parameter for future heavy-ion collision studies.