Speaker
Eduardo Grossi
(University of Florence & INFN Florence)
Description
We present an extension of relativistic single-particle distribution function for weakly interacting particles at local thermodynamical equilibrium including spin degrees of freedom, for massive spin 1/2 particles. We infer, on the basis of the global equilibrium case, that at local thermodynamical equilibrium particles acquire a net polarization proportional to the vorticity of the inverse temperature four-vector field. The obtained formula for polarization also implies that a steady gradient of temperature entails a polarization orthogonal to particle momentum. The single-particle distribution function in momentum space extends the so-called Cooper-Frye formula to particles with spin 1/2 and allows to predict their polarization, and particularly of Lambda hyperons, in relativistic heavy ion collisions at the freeze-out.
Primary authors
Eduardo Grossi
(University of Florence & INFN Florence)
Francesco Becattini
(Unversity of Florence)
Co-authors
Prof.
Luca Del Zanna
(University of Florence)
Dr
Vinod Chandra
(INFN Florence, Italy)
