Global polarization of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">Λ</mml:mi></mml:math>
 and 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mover><mml:mi mathvariant="normal">Λ</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>
 hyperons in Pb-Pb collisions at 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml

Acharya, S.; Antičić, T.; Erhardt, F.; Gotovac, S.; Jercic, M.; Lončar, P.; Mudnić, E.; Planinić, M.; Poljak, N.; Simatovic, G.; Utrobicic, A.; Vickovic, L.; Zurlo, N.

doi:10.1103/physrevc.101.044611

Cited by 89 publications

(37 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The polarization is found to decrease with increasing ffiffiffiffiffiffiffi ffi s NN p [39,40]. At the LHC, the global polarization for Λ baryon is compatible with zero within uncertainties [P Λ ð%Þ ¼ 0.01 AE 0.06 AE 0.03] [41]. The spin alignment for vector mesons in heavy ion collisions could have contributions from angular momentum [12,13], electromagnetic fields [15] and mesonic fields [38].…”

mentioning

confidence: 90%

“…In the recombination model, Λ polarization depends linearly on quark polarization whereas vector meson polarization depends quadratically on it. One would therefore expect the polarization for K Ã0 to be of the same order or smaller than the one measured for the Λ at LHC [41], i.e., vanishing small [Oð0.01%Þ] rather than order 1. The large effect observed for the ρ 00 in mid-central Pb-Pb collisions at low p T is therefore puzzling.…”

mentioning

confidence: 93%

See 1 more Smart Citation

Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

Acharya¹,

Adamová²,

Adler³

et al. 2020

Phys. Rev. Lett.

Self Cite

137

View full text Add to dashboard Cite

The first evidence of spin alignment of vector mesons (K Ã0 and ϕ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ 00 is measured at midrapidity (jyj < 0.5) in Pb-Pb collisions at a center-of-mass energy (ffiffiffiffiffiffiffi ffi s NN p) of 2.76 TeV with the ALICE detector. ρ 00 values are found to be less than 1=3 (1=3 implies no spin alignment) at low transverse momentum (p T < 2 GeV=c) for K Ã0 and ϕ at a level of 3σ and 2σ, respectively. No significant spin alignment is observed for the K 0 S meson (spin ¼ 0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.

show abstract

mentioning

confidence: 90%

mentioning

confidence: 93%

Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

Acharya¹,

Adamová²,

Adler³

et al. 2020

Phys. Rev. Lett.

Self Cite

137

View full text Add to dashboard Cite

show abstract

“…Collisions of large nuclei at ultra-high energy, both at RHIC and LHC, are expected to produce very large magnetic fields and have been predicted to induce large vorticity and global polarization effects as well as finite out of plane charge separation associated with the chiral magnetic effect (CME). While the existence of the CME remains to be established, both STAR and ALICE collaborations have reported observations of global polarization of -baryons [77][78][79] believed to result from the presence of large vorticity in Au-Au and Pb-Pb collisions. It has been suggested that the presence of large magnetic fields might also have an impact on viscous effects [80] as they might strongly suppress momentum diffusion in the reaction plane or impart a "paramagnetic squeezing" effect capable of altering pressure gradients.…”

Section: Discussionmentioning

confidence: 99%

Extraction of the specific shear viscosity of quark-gluon plasma from two-particle transverse momentum correlations

et al. 2021

View full text Add to dashboard Cite

The specific shear viscosity, $$\eta /s$$ η / s , of the quark-gluon plasma formed in ultrarelativistic heavy-ion collisions at RHIC and LHC is estimated based on the progressive longitudinal broadening of transverse momentum two-particle correlators, $$G_2$$ G 2 , reported as a function of collision centrality by the STAR and ALICE experiments. Estimates are computed as a function of collision centrality using the Gavin ansatz which relates the $$G_2$$ G 2 longitudinal broadening to the specific shear viscosity. Freeze out times required for the use of the ansatz are computed using a linear fit of freeze out times reported as a function of the cubic root of the charged particle pseudorapidity density ($${\mathrm{d}}N_{\mathrm{ch}}$$ d N ch /d$$\eta )^{1/3}$$ η ) 1 / 3 . Estimates of $$\eta /s$$ η / s based on ALICE data exhibit little to no dependence on collision centrality at LHC energy, while estimates obtained from STAR data hint that $$\eta /s$$ η / s might be a function of collision centrality at top RHIC energy.

show abstract

“…For better understanding the nature of vorticity and spin dynamics in heavy-ion collisions, the measurement has Fig. 12 Global polarization as a function of the collision energy for and¯ hyperons as well as for and hyperons [84,85,[91][92][93]. Solid line and shaded bands denote calculations from viscous hydrodynamic model (vHLLE) with UrQMD initial condition [86] as well as a multi-phase transport (AMPT) model [87] respectively.…”

Section: Vorticity and Polarizationmentioning

confidence: 99%

Signatures of QGP at RHIC and the LHC

Niida

Miake

2021

AAPPS Bull.

Self Cite

View full text Add to dashboard Cite

The progress over the 30 years since the first high-energy heavy-ion collisions at the BNL-AGS and CERN-SPS has been truly remarkable. Rigorous experimental and theoretical studies have revealed a new state of the matter in heavy-ion collisions, the quark-gluon plasma (QGP). Many signatures supporting the formation of the QGP have been reported. Among them are jet quenching, the non-viscous flow, direct photons, and Debye screening effects. In this article, selected signatures of the QGP observed at RHIC and the LHC are reviewed.

show abstract

Global polarization of Λ and Λ¯ hyperons in Pb-Pb collisions at sNN

Cited by 89 publications

References 81 publications

Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

Extraction of the specific shear viscosity of quark-gluon plasma from two-particle transverse momentum correlations

Signatures of QGP at RHIC and the LHC

Contact Info

Product

Resources

About