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Sep 24 – 29, 2023
US/Eastern timezone

Exact polarization of particles of any spin at global equilibrium in a relativistic fluid

Sep 25, 2023, 4:20 PM
20m
Junior A3 (Durham Convention Center)

Junior A3

Durham Convention Center

Talk Spin in Heavy Ion Collisions Spin in Heavy Ion Collisions

Speaker

Andrea Palermo (Frankfurt UNiversity)

Description

The polarization of the Λ particle offers the unique opportunity to study the hydrodynamic gradients in the Quark-Gluon Plasma formed in heavy-ion collisions. However, the theoretical formula commonly used to calculate polarization is only a linear order expansion in thermal vorticity and neglects higher-order terms. Here, we present an exact calculation at all orders in (constant) thermal vorticity at global equilibrium. We resum the series and obtain the analytic form of the spin density matrix and the polarization vector for massive and massless particles of any spin or helicity. Finally, we extend our results to local equilibrium, where we evaluate their impact in heavy-ion collisions by numerically calculating polarization in a 3+1 hydrodynamic simulation for different collision energy.

Primary authors

Andrea Palermo (Frankfurt UNiversity) Prof. Francesco Becattini (Università di Firenze)

Presentation materials