Exploring Spin Polarization of Heavy Quarks in Magnetic Fields and Hot Medium

Abstract

Relativistic heavy-ion collisions give rise to the formation of both deconfined QCD matter and a strong magnetic field. The spin of heavy quarks is influenced by interactions with the external magnetic field as well as by random scatterings with thermal light partons. The presence of QCD matter comprising charged quarks can extend the lifetime and strength of the magnetic field, thereby enhancing the degree of heavy quark polarization. However, the random scatterings with QCD matter tend to diminish heavy quark polarization. In this study, we utilize the Landau-Lifshitz-Gilbert (LLG) equation to investigate both these contributions. Taking into account the realistic evolutions of medium temperatures and the in-medium magnetic fields at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC), we observe that heavy quark polarization is limited by the short lifetime of the magnetic field and the high temperatures of the medium. Furthermore, we explore the mass dependence of quark polarization, revealing that the polarization degree of strange quarks is much larger than that of charm quarks.

7 pages, 13 figures

References in corpus (62)

• The order of the quantum chromodynamics transition predicted by the standard model of particle physics
• The equation of state in (2+1)-flavor QCD
• The chiral and deconfinement aspects of the QCD transition
• Global $\Lambda$ hyperon polarization in nuclear collisions: evidence for the most vortical fluid
• Elliptic and triangular flow in event-by-event (3+1)D viscous hydrodynamics
• Event-by-event generation of electromagnetic fields in heavy-ion collisions
• Chiral Magnetic and Vortical Effects in High-Energy Nuclear Collisions --- A Status Report
• The p_T Spectrum in Heavy-Flavour Hadroproduction
• Hadronization in heavy ion collisions: Recombination and fragmentation of partons
• 3+1D hydrodynamic simulation of relativistic heavy-ion collisions
• Globally Polarized Quark-gluon Plasma in Non-central A+A Collisions
• Causal viscous hydrodynamics in 2+1 dimensions for relativistic heavy-ion collisions
• Applying Bayesian parameter estimation to relativistic heavy-ion collisions: simultaneous characterization of the initial state and quark-gluon plasma medium
• 200 A GeV Au+Au collisions serve a nearly perfect quark-gluon liquid
• Parton coalescence at RHIC
• Multiple Scattering, Parton Energy Loss and Modified Fragmentation Functions in Deeply Inelastic eA Scattering
• The p_T Spectrum in Heavy-Flavour Photoproduction
• Chiral Magnetic Wave
• Properties of hot and dense matter from relativistic heavy ion collisions
• Jet quenching in high-energy heavy-ion collisions
• Quark Coalescence for Charmed Mesons in Ultrarelativistic Heavy-Ion Collisions
• The significance of the fragmentation region in ultrarelativistic heavy ion collisions
• Electromagnetic fields and anomalous transports in heavy-ion collisions --- A pedagogical review
• Heavy Quark Energy Loss in Nuclear Medium
• Global hyperon polarization at local thermodynamic equilibrium with vorticity, magnetic field and feed-down
• Extraction of Heavy-Flavor Transport Coefficients in QCD Matter
• Beam-Energy Dependence of Directed Flow of Protons, Antiprotons and Pions in Au+Au Collisions
• Heavy quark dynamics and hadronization in ultra-relativistic heavy-ion collisions: collisional versus radiative energy loss
• Study of Lambda polarization in relativistic nuclear collisions at sqrt{s}_NN = 7.7-200 GeV
• Charmonium and bottomonium production in heavy-ion collisions
• A study of vorticity formation in high energy nuclear collisions
• Directed Flow of Charm Quarks as a Witness of the Initial Strong Magnetic Field in Ultra-Relativistic Heavy Ion Collisions
• Global $\Lambda$ polarization in heavy-ion collisions from a transport model
• Numerical magneto-hydrodynamics for relativistic nuclear collisions
• Generating spin polarization from vorticity through nonlocal collisions
• Energy loss, hadronization and hadronic interactions of heavy flavors in relativistic heavy-ion collisions
• Jet quenching and medium response in high-energy heavy-ion collisions: a review
• Directed flow in ultrarelativistic heavy-ion collisions
• Anomalous Chiral Transport in Heavy Ion Collisions from Anomalous-Viscous Fluid Dynamics
• A data-driven analysis for the temperature and momentum dependence of the heavy quark diffusion coefficient in relativistic heavy-ion collisions
• Anomalous chiral transports and spin polarization in heavy-ion collisions
• First observation of the directed flow of $D^0$ and $\overline{D^0}$ in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200~GeV
• A quark coalescence model for polarized vector mesons and baryons
• Upsilon Production as a Probe for Early State Dynamics in High Energy Nuclear Collisions at RHIC
• Large directed flow of open charm mesons probes the three dimensional distribution of matter in heavy ion collisions
• Heavy Quark Diffusion from 2+1 Flavor Lattice QCD with 320 MeV Pion Mass
• Improved quark coalescence model for spin alignment and polarization of hadrons
• $T$-matrix Approach to Quark-Gluon Plasma
• Realistic Implementation of Chiral Magnetic Wave in Heavy Ion Collisions
• Anomalous-hydrodynamic analysis of charge-dependent elliptic flow in heavy-ion collisions
• Thermally assisted spin transfer torque switching in synthetic free layers
• A microscopic description for polarization in particle scatterings
• Out-of-Equilibrium Chiral Magnetic Effect from Chiral Kinetic Theory
• Realization of the thermal equilibrium in inhomogeneous magnetic systems by the Landau-Lifshitz-Gilbert equation with stochastic noise, and its dynamical aspects
• Relativistic Langevin Dynamics in Expanding Media
• Bottomonium Continuous Production from Unequilibrium Bottom Quarks in Ultrarelativistic Heavy Ion Collisions
• Spin-transfer and spin-orbit torques in the Landau-Lifshitz-Gilbert equation
• X(3872) Production in Relativistic Heavy-Ion Collisions
• Probing the initial longitudinal density profile and electromagnetic field in ultrarelativistic heavy-ion collisions with heavy quarks
• Thermal and thermoelectric responses of hot QCD medium in time-varying magnetic fields
• Bottom energy loss and non-prompt $J/\psi$ production in relativistic heavy ion collisions
• Machine learning approach to analyze heavy quark diffusion coefficient in relativistic heavy-ion collisions

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