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We present a systematic study of $\Lambda$ hyperon's polarization observables using event-by-event (3+1)D relativistic hydrodynamics. The effects of initial hot spot size and QGP's specific shear viscosity on the polarization observables…

Nuclear Theory · Physics 2022-07-27 Sahr Alzhrani , Sangwook Ryu , Chun Shen

We present a calculation of the global polarization of Lambda hyperons in relativistic Au-Au collisions at RHIC Beam Energy Scan range sqrt{s}_NN = 7.7 - 200 GeV with a 3+1 dimensional cascade + viscous hydro + cascade model, UrQMD+vHLLE.…

Nuclear Theory · Physics 2017-04-07 Iu. Karpenko , F. Becattini

In non-central nuclear collisions, the created matter should exhibit strong vorticity, which induces spin polarization. Global polarization is a good tool to investigate the dynamics of the system. Global polarization of $\Lambda$ and…

Nuclear Experiment · Physics 2022-02-16 Kosuke Okubo

Since its discovery, global polarization of the $\Lambda$ hyperon in heavy-ion collisions has been firmly established and is widely attributed to the large vorticity generated in the rotating quark-gluon plasma. In contrast, nearly fifty…

High Energy Physics - Phenomenology · Physics 2026-03-23 Feng Liu , Zhoudunming Tu

The gold--gold collisions at $\sqrt{s_{NN}}=7.7$ and $11.5$GeV are simulated within the PHSD transport model. In each collision event, the spectator nucleons are separated and the fluidization procedure for the participants is performed.…

Nuclear Theory · Physics 2023-04-24 Nikita Tsegelnik , Evgeni Kolomeitsev , Vadym Voronyuk

Global polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons in Au+Au collisions at collision energies $\sqrt{s_{NN}}=$ 4-40 GeV in the midrapidity region and total polarization, i.e. averaged over all rapidities, are studied within the…

Nuclear Theory · Physics 2019-07-31 Yu. B. Ivanov , V. D. Toneev , A. A. Soldatov

We report the measurements of $\Lambda$ hyperons' global and local spin polarization from second phase of the RHIC Beam Energy Scan (BES-II) in Au+Au collisions at $\sqrt{s_{NN}}$= 7.7--27 GeV. Global polarization measurements of…

Nuclear Experiment · Physics 2024-12-16 Q. Hu

Global spin polarization of hyperons is an important observable to probe the vorticity of the quark-gluon plasma produced in heavy-ion collisions. We calculate the global polarizations of $\Lambda$, $\Xi^-$, and $\Omega^-$ in Au+Au…

Nuclear Theory · Physics 2022-03-01 Hui Li , Xiao-Liang Xia , Xu-Guang Huang , Huan Zhong Huang

Polarization of the \Lambda hyperon produced with a large transverse momentum in the unpolarized nucleon-nucleon collision is analyzed in the framework of QCD factorization. We focus on the mechanism in which the soft-gluon component of the…

High Energy Physics - Phenomenology · Physics 2009-10-31 Y. Kanazawa , Yuji Koike

We perform a systematic study of the spin polarization of hyperons in heavy-ion collisions using the MUSIC hydrodynamic model with A Multi-Phase Transport (AMPT) pre-equilibrium dynamics. Our model calculations nicely describe the measured…

Nuclear Theory · Physics 2021-02-10 Baochi Fu , Kai Xu , Xu-Guang Huang , Huichao Song

We discuss Lambda polarization and single-spin left-right asymmetry in diffractive hadron-hadron scattering at high energies. We show that the physical picture proposed in a recent Letter is consistent with the experimental observation that…

High Energy Physics - Phenomenology · Physics 2009-10-31 Zuo-tang Liang , C. Boros

We briefly review the thermal model predictions related to longitudinal spin polarization of $\Lambda-$hyperons emitted from a hot and rotating hadronic medium produced in the non-central relativistic heavy ion collisions.

High Energy Physics - Phenomenology · Physics 2022-08-04 Wojciech Florkowski , Avdhesh Kumar , Aleksas Mazeliauskas , Radoslaw Ryblewski

Based on the formalism presented in [1], we make a systematic study of spin polarizations of hadrons with different spins including vector mesons, spin-1/2 and spin-3/2 hyperons and spin correlations of hadron-hadron such as…

Nuclear Theory · Physics 2026-03-17 Ji-peng Lv , Zi-han Yu , Xiao-wen Li , Zuo-tang Liang

We have implemented the 3+1 dimensional CLVisc hydrodynamics model with TRENTO-3D initial conditions to investigate the spin polarization of $\Lambda$ hyperons along the beam direction in p+Pb collisions at $\sqrt{s_{NN}} = 8.16$ TeV.…

High Energy Physics - Phenomenology · Physics 2024-09-02 Cong Yi , Xiang-Yu Wu , Jie Zhu , Shi Pu , Guang-You Qin

The polarization of $\Lambda$ hyperons is preserved in the angular distribution of their decay products. This property allows one to study the spin structure of the $\Lambda$. In Semi-Inclusive Deep Inelastic Scattering where a high energy…

High Energy Physics - Experiment · Physics 2026-03-25 M. McEneaney , A. Vossen

We consider polarized Lambda hyperon production in proton-proton scattering, p p -> (\Lambda^\uparrow jet) jet X, in the kinematical region of the LHC experiments, in particular the ALICE experiment. We present a new Lambda polarization…

High Energy Physics - Phenomenology · Physics 2008-11-26 D. Boer , C. J. Bomhof , D. S. Hwang , P. J. Mulders

A QCD formula for the polarization in the large-p_T \Lambda hyperon production in the unpolarized nucleon-nucleon collision at large x_F is derived. We focus on the mechanism in which the chiral-odd spin-independent twist-3 quark…

High Energy Physics - Phenomenology · Physics 2009-10-31 Y. Kanazawa , Yuji Koike

Spin effects in the tunneling regime of strong field ionization of hydrogenlike highly charged ions in linearly as well as circularly polarized laser fields are investigated. The impact of the polarization of a laser field on the spin…

Quantum Physics · Physics 2018-07-04 Enderalp Yakaboylu , Michael Klaiber , Karen Z. Hatsagortsyan

Spin polarization provides a novel probe of the rotational properties of the quark-gluon plasma formed in relativistic heavy-ion collisions. This work investigates the equation of state, particularly its transport and thermodynamic…

Nuclear Theory · Physics 2026-02-12 De-Xian Wei

We calculate the contribution to the polarization of $\Lambda$ hyperons in relativistic nuclear collisions at high energy from the decays of $\Sigma^*(1385)$ and $\Sigma^0$, which are the predominant sources of $\Lambda$ production besides…

Nuclear Theory · Physics 2019-10-02 F. Becattini , Gaoqing Cao , Enrico Speranza