Hydrodynamic study of hyperon spin polarization in relativistic heavy ion collisions

Fu, B.; Xu, Kai; Huang, Xuguang; Song, Huichao

doi:10.1103/physrevc.103.024903

Cited by 78 publications

(44 citation statements)

References 92 publications

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“…Note that at high energies the global polarization show similar centrality dependence which can also be described by approach I (see, e.g., Ref. [21]). and by STAR Collaboration [44].…”

Section: Resultssupporting

confidence: 67%

“…Another feature is that both Λ and Λ global polarization decrease with increasing collision energy √ s NN ≥ 7.7 GeV which is consistent with the collision energy dependence of fluid vorticity at mid-rapidity [13,14]. The calculations from hydrodynamical [15,16] and transport-model approaches can explain well the experimental results for global Λ polarization [17][18][19][20][21][22][23][24][25] and also Ξ and Ω polarization [25][26][27], eg., see Refs. [28][29][30][31][32][33] for reviews.…”

Section: Introductionsupporting

confidence: 73%

“…[8] based on chiral kinetic theory and in Ref. [21] based on a hydrodynamical model at higher energies, making the theoretical results quite model dependent in describing the p T dependence. The dependence of Λ polarization on rapidity is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Lambda polarization in $^{108}$Ag +$^{108}$Ag and $^{197}$Au +$^{197}$Au collisions around a few GeV

Deng,

Huang,

2021

Preprint

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Within the framework of Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model, we extract the global spin polarization of Λ hyperon in 108 Ag + 108 Ag and 197 Au + 197 Au collisions at √ sNN = 2.42 − 7.7 GeV. We use two different methods to calculate the Λ polarization Py: one is based on equilibrium assumption so that Py is determined by thermal vorticity and another assumes a proportional relation between Py and the system's angular momentum in Λ's rest frame. We find that both methods can describe the experimental data suggesting that the global spin polarization is a result of global angular momentum and is thus insensitive to the intermediate prescription to extracting it.

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“…Note that at high energies the global polarization show similar centrality dependence which can also be described by approach I (see, e.g., Ref. [21]). and by STAR Collaboration [44].…”

Section: Resultssupporting

confidence: 67%

Section: Introductionsupporting

confidence: 73%

See 1 more Smart Citation

Lambda polarization in $^{108}$Ag +$^{108}$Ag and $^{197}$Au +$^{197}$Au collisions around a few GeV

Deng,

Huang,

2021

Preprint

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“…As a result, the difference between the primary global polarizations of Λ and Ξ − is very small. Recent hydrodynamic calculation [27] yielded similar conclusion.…”

Section: Resultssupporting

confidence: 65%

Global hyperon polarization and effects of decay feeddown

Xia

Huang

et al. 2022

EPJ Web Conf.

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We study the global polarizations of Λ, Ξ−, and Ω− hyperons in noncentral Au + Au collisions at √SNN = 7.7-200 GeV. We highlight the importance of effect of decay feeddown to the measured global polarization. With the decay contributions taken into account, the global polarization ordering PΩ− > PΞ− > PΛ can be naturally explained, which is consistent with the observation recently reported from the STAR experiment from Au+Au collisions at 200 GeV. We also extend our calculations to predict expectations from the RHIC-BES II data.

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“…These novel contributions (7.4) lead to several implications in relativistic many-body systems where an inhomogeneous fluid vorticity is experimentally generated. In rotating quark-gluon plasma, there emerges the quadrupole configuration of the vorticity along the beam direction [59][60][61][62]. Thus, on the transverse plane to the beam direction, the inhomogeneous vorticities generate the charge current J ⊥ and the energy current J ⊥ , as depicted in figure 1.…”

Section: Jhep05(2021)023mentioning

confidence: 99%

Second order chiral kinetic theory under gravity and antiparallel charge-energy flow

Hayata

Hidaka

Mameda

2021

J. High Energ. Phys.

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We derive the chiral kinetic theory under the presence of a gravitational Riemann curvature. It is well-known that in the chiral kinetic theory there inevitably appears a redundant ambiguous vector corresponding to the choice of the Lorentz frame. We reveal that on top of this conventional frame choosing vector, higher-order quantum correction to the chiral kinetic theory brings an additional degrees of freedom to specify the distribution function. Based on this framework, we derive new types of fermionic transport, that is, the charge current and energy-momentum tensor induced by the gravitational Riemann curvature. Such novel phenomena arise not only under genuine gravity but also in a (pseudo-)relativistic fluid, for which inhomogeneous vorticity or temperature are effectively represented by spacetime metric tensor. It is especially found that the charge and energy currents are antiparallelly induced by an inhomogeneous fluid vorticity (more generally, by the Ricci tensor R0i), as a consequence of the spin-curvature coupling. We also briefly discuss possible applications to Weyl/Dirac semimetals and heavy-ion collision experiments.

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Hydrodynamic study of hyperon spin polarization in relativistic heavy ion collisions

Cited by 78 publications

References 92 publications

Lambda polarization in $^{108}$Ag +$^{108}$Ag and $^{197}$Au +$^{197}$Au collisions around a few GeV

Lambda polarization in $^{108}$Ag +$^{108}$Ag and $^{197}$Au +$^{197}$Au collisions around a few GeV

Global hyperon polarization and effects of decay feeddown

Second order chiral kinetic theory under gravity and antiparallel charge-energy flow

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