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 hyperon polarization in relativistic heavy ion collisions from a chiral kinetic approach

Sun, Yifeng; Ko, Che Ming

doi:10.1103/physrevc.96.024906

Cited by 139 publications

(99 citation statements)

References 54 publications

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“…To obtain the fluid velocity and then the vorticity at one space-time point, suitable coarse graining procedure has to be used. Once the vorticity field is obtained, the global polarization of hyperons can be calculated from an integral over the freezeout hyper-surface which agrees well with the data [61][62][63][64][65].…”

Section: Introductionsupporting

confidence: 59%

Local spin polarization in high energy heavy ion collisions

Pang

Huang

et al. 2019

Phys. Rev. Research

101

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We revisit the azimuthal angle dependence of the local spin polarization of hyperons in heavy-ion collisions at 200 GeV in the framework of the (3+1)D viscous hydrodynamic model CLVisc. Two different initial conditions are considered in our simulation: the optical Glauber initial condition without initial orbital angular momentum and the AMPT initial condition with an initial orbital angular momentum. We find that the azimuthal angle dependence of the hyperon polarization strongly depends on the choice of the so-called spin chemical potential Ωµν . With Ωµν chosen to be proportional to the temperature vorticity, our simulation shows qualitatively coincidental results with the recent measurements at RHIC for both the longitudinal and transverse polarization. We argue that such a coincidence may be related to the fact that the temperature vorticity is approximately conserved in the hot quark-gluon matter. *

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Section: Introductionsupporting

confidence: 59%

Local spin polarization in high energy heavy ion collisions

Pang

Huang

et al. 2019

Phys. Rev. Research

101

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“…These updated calculations drew the attention of the experimentalists and convinced them to attempt a new measurement with a larger statistics in the years 2015-2017. This eventually led to the first positive measurement of the global Λ-hyperon spin polarization by STAR [16,17] being in quantitative agreement with the theoretical predictions [18,19,20,21].…”

Section: Introductionsupporting

confidence: 53%

Relativistic hydrodynamics for spin-polarized fluids

Florkowski

Kumar

Ryblewski

2019

Progress in Particle and Nuclear Physics

200

193

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A R T I C L E I N F O Keywords: relativistic heavy-ion collisions relativistic hydrodynamics spin polarization pseudo-gauge transformations semi-classical expansion Pauli-Lubański vector A B S T R A C T Recent progress in the formulation of relativistic hydrodynamics for particles with spin one-half is reviewed. We start with general arguments advising introduction of a tensor spin chemical potential that plays a role of the Lagrange multiplier coupled to the spin angular momentum. Then, we turn to a discussion of spin-dependent distribution functions that have been recently proposed to construct a hydrodynamic framework including spin and serve as a tool in phenomenological studies of hadron polarization. Distribution functions of this type are subsequently used to construct the equilibrium Wigner functions that are employed in the semi-classical kinetic equation. The semi-classical expansion elucidates several aspects of the hydrodynamic approach, in particular, shows the ways in which different possible versions of hydrodynamics with spin can be connected by pseudo-gauge transformations. These results point out at using the de Grootvan Leeuwen -van Weert versions of the energy-momentum and spin tensors as the most natural and complete physical variables. Finally, a totally new method is proposed to design hydrodynamics with spin, which is based on the classical treatment of spin degrees of freedom. Interestingly, for small values of the spin chemical potential the new scheme brings the results that coincide with those obtained before. The classical approach also helps us to resolve problems connected with the normalization of the spin polarization three-vector. In addition, it clarifies the role of the Pauli-Lubański vector and the entropy current conservation. We close our review with several general comments presenting possible future developments of the discussed frameworks.

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“…The magnitude of measured polarization is in general agreement with calculations from different hydrodynamic models [2,3] and AMPT [4,5]. In the hydrodynamic models the Λ hyperons produced at particlization (fluid to particle transition) hypersurface acquire polarization via spin-vorticity coupling mechanism.…”

Section: Introductionsupporting

confidence: 74%

Study of Lambda polarization at RHIC BES and LHC energies

Karpenko

Becattini

2018

EPJ Web Conf.

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Abstract. In hydrodynamic approach to relativistic heavy ion collisions, hadrons with nonzero spin, produced out of the hydrodynamic medium, can acquire polarization via spin-vorticity thermodynamic coupling mechanism. The hydrodynamical quantity steering the polarization is the thermal vorticity, that is minus the antisymmetric part of the gradient of four-temperature field. Based on this mechanism there have been several calculations in hydrodynamic and non-hydrodynamic models for non-central heavy ion collisions in the RHIC Beam Energy Scan energy range, showing that the amount of polarization of produced Λ hyperons ranges from few percents to few permille, and decreases with collision energy. We report on an extension of our existing calculation of global Λ polarization in UrQMD+vHLLE model to full RHIC and LHC energies, and discuss the component of polarization along the beam direction, which is the dominant one at high energies.

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Λ hyperon polarization in relativistic heavy ion collisions from a chiral kinetic approach

Cited by 139 publications

References 54 publications

Local spin polarization in high energy heavy ion collisions

Local spin polarization in high energy heavy ion collisions

Relativistic hydrodynamics for spin-polarized fluids

Study of Lambda polarization at RHIC BES and LHC energies

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