Quark Matter 2019 - the XXVIIIth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions

Session

Parallel Session - Chirality III

6 Nov 2019, 14:00

Wanda Reign Wuhan Hotel

Conveners

Parallel Session - Chirality III

• Fuqiang Wang (Purdue University (US))

750. Differential measurements of $\Lambda$ polarization in Au+Au collisions and a search for the magnetic field by STAR

Joseph Adams for the STAR Collaboration (Ohio State University)

06/11/2019, 14:00

Chirality, vorticity and spin polarization

Oral Presentation

Lambda polarization $P_{\Lambda/\bar{\Lambda}}$ was measured by the STAR collaboration [1], confirming the existence of extremely large vorticities within the Quark-Gluon Plasma (QGP). A recent study using a high-statistics data set at $\sqrt{s_{NN}} = 200$ GeV has shown the dependence of $P_{\Lambda/\bar{\Lambda}}$ on collision centrality, azimuthal angle ($\varphi$), transverse momentum...

154. Magnetic Field in the Charged Subatomic Swirl

Xingyu Guo (South China Normal Univeristy)

06/11/2019, 14:20

Chirality, vorticity and spin polarization

Oral Presentation

We suggest a novel link between rotation and magnetic field in a charged fluid system: a magnetic field naturally arises along the fluid vorticity direction from the currents associated with the swirling charges. This general connection is demonstrated both for a single particle and for a fluid vortex. Applying the idea for heavy ion collisions we propose it as a new mechanism for generating...

40. Mass Correction to Chiral Kinetic Equations

Ziyue Wang (Tsinghua University)

06/11/2019, 14:40

Chirality, vorticity and spin polarization

Oral Presentation

We study fermion mass correction to chiral kinetic equations in electromagnetic fields. Different from the chiral limit where fermion number density is the only independent distribution, the number and spin densities are coupled to each other for massive fermion systems. To the first order in ̄h, we derived the quantum correction to the classical on-shell condition and the Boltzmann-type...

445. Kinetic theory for massive spin-1/2 particles from the Wigner-function formalism

Nora Weickgenannt (Goethe University Frankfurt)

06/11/2019, 15:00

Chirality, vorticity and spin polarization

Oral Presentation

We calculate the Wigner function for massive spin-1/2 particles in an inhomogeneous electromagnetic field to leading order in the Planck constant. Going beyond leading order in $\hbar$ we then derive a generalized Boltzmann equation in which the force exerted by an inhomogeneous electromagnetic field on the particle dipole moment arises naturally. Furthermore, a kinetic equation for this...

717. Hydrodynamics of particles with spin 1/2

Wojciech Florkowski (Institute of nuclear Physics, Krakow)

06/11/2019, 15:20

Chirality, vorticity and spin polarization

Oral Presentation

The formulation of relativistic hydrodynamics of particles with spin 1/2 will be shortly reviewed. The proposed framework is based on the Wigner function treated in a semi-classical approximation or, alternatively, on a classical treatment of spin 1/2. The consistency of the two approaches will be demonstrated and first numerical solutions of the obtained scheme will be shown. Several...

367. Quantum Kinetic Theory of Spin Polarization of Massive Quarks in Perturbative QCD

Shiyong Li (University of illinois at chicago)

06/11/2019, 15:40

Chirality, vorticity and spin polarization

Oral Presentation

We present the quantum kinetic equation for spin polarization of massive quarks in leading log order of perturbative QCD, which describes time evolution of the spin density matrix in momentum space of a massive quark interacting with a background QCD plasma. We find that the time evolution operator of the spin density matrix, or the quantum kinetic collision terms, are universally of order...