Polarization of $Λ$ and $\overlineΛ$ hyperons along the beam direction in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

Signatures of the spin Hall effect in hot and dense QCD matter

“…The materials mentioned above are at or below room temperature and are microscopically described by QED. In contrast, in this letter, we will study and predict the signatures of the SHE in the spin polarization of Λ hyperon (and Λ anti-hyperon) produced in the extremely hot and dense QCD matter created in relativistic heavy-ion collisions where the spin carriers (quarks, gluons and/or hadrons) interact with each other through strong interaction in media at temperature above 10 12 K. Recently, the observation of Λ (Λ) polarization at Relativistic Heavy-ion Collider (RHIC) and Large Hadron Collider (LHC) [8][9][10][11][12][13] has inspired many studies on spin dynamics of QCD many-body physics, (see Refs. [9,14] for reviews).…”

Equivalence of canonical and phenomenological formulations of spin hydrodynamics

“…Recent observations of spin polarization of weakly decaying hyperons produced in relativistic heavy-ion experiments across various collision energies [1][2][3][4][5][6][7][8][9] have provided a unique probe to study polarization phenomena in relativistic nuclear matter under rotation [10]. Motivated by the earlier successes of relativistic fluid dynamics in heavy-ion phenomenology [11], several extensions of relativistic hydrodynamics for the spinpolarized fluids have been developed using quantum statistical density operators [12][13][14][15][16], relativistic kinetic theory [17][18][19][20][21][22][23][24][25][26][27][28][29], effective Lagrangian approach [30][31][32][33], entropy current analysis [34][35][36][37][38][39], holography [40,41] and equilibrium partition functions [42].…”

Relativistic magnetohydrodynamics with spin

“…Particularly interesting directions of study which are recently being followed include investigations of spin polarization phenomena in relativistic nuclear matter [12,13] and its dynamics under the influence of electromagnetic fields (EM) [14]. Recent spin polarization measurements of emitted particles provided a new probe for studying QGP [15][16][17][18][19][20][21][22] and triggered many theoretical developments [23][24][25][26][27][28][29][30][31][32], see also [33][34][35][36][37][38][39][40][41][42]. Being oriented along the direction of the global angular momentum of the colliding system, microscopically, the spin polarization is believed to arise because of the spin-orbit coupling [43].…”