Spin polarization of fermions at local equilibrium: Second-order gradient expansion

Autor:	Sheng, Xin-Li, Becattini, Francesco, Huang, Xu-Guang, Zhang, Zhong-Hua
Rok vydání:	2024
Předmět:	High Energy Physics - Theory High Energy Physics - Phenomenology Nuclear Theory
Druh dokumentu:	Working Paper
Popis:	We present a calculation of the spin polarization of spin-1/2 fermions in a relativistic fluid at local thermodynamic equilibrium at the second order in the gradient expansion, including second-order derivatives. The second-order derivative terms vanish if the local equilibrium hypersurface is the hyperplane $t=const$ in the collision center-of-mass frame. However, since the freeze-out hypersurface has a non-trivial space-time structure, these terms may result in a non-vanishing contribution to the spin polarization, whose magnitude needs to be assessed with numerical computations. Comment: 18 pages, 2 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2407.12130 Zobrazit plný text záznamu View this record from Arxiv