Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of thermal shear on longitudinal spin polarization in a thermal
  model   By including the recently introduced thermal shear term that contributes to
the spin polarization vector at local equilibrium, we determine longitudinal
polarization of $\Lambda$ hyperons emitted from a hot and rotating hadronic
medium using the thermal model with single freeze-out. In our analysis, we
consider the RHIC top energies and use the model parameters which were
determined in the earlier analyses of particle spectra and elliptic flow. We
confirm that, unlike the previous calculations done by using only the thermal
vorticity, the thermal shear term alone leads to the correct sign of the
quadrupole structure of the longitudinal component of the polarization
three-vector measured in experiments. However, we find almost complete
cancellation between thermal shear and vorticity terms, which eventually leads
to disagreement with the data. To clarify the role played by velocity and
temperature gradient terms, we present a systematic analysis of different
contributions to the longitudinal polarization.

24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an