Design Method of Steel Plate-Rubber Energy Absorption Ring

Vorticity and particle polarization in heavy ion collisions (experimental perspective)

“…Global polarization dependence on centrality, the hyperon transverse momentum, and the orientation of the hyperon emission relative to the reaction plane have been also of great interest as different models predict significantly different dependencies. Within the available statistic, both, the centrality and p T dependencies, see the preliminary STAR results [10,20] presented in Fig. 4, are rather modest.…”

“…4, are rather modest. The azimuthal angle dependence is discussed in more detail in [10]. The preliminary results indicate stronger polarization of the hyperons emitted in-plane than those emitted out-of-plane, opposite to the expectations from the hydrodynamical calculations [21].…”

“…The progress in vector spin alignments measurements was presented at this conference in talks by the STAR and ALICE Collaborations [10,11]. The uncertainties in these measurements are still relatively large, and the results are rather inconclusive; below I concentrate on the discussion of the global polarization results.…”

“…The uncertainties in these measurements are still relatively large, and the results are rather inconclusive; below I concentrate on the discussion of the global polarization results. Figure 3 shows a compilation of published [3,12] and presented at this conference [10,11] results on the average global polarization of lambda and anti-lambda hyperons at mid-rapidity in mid-central collisions as a function of collision energy. The blue solid and dashed lines are the results of hydrodynamic calculation [7,13], with and without accounting for the hyperon feed-down contribution, respectively.…”

“…In our convention, which follows that of ref. [10], this vector has a maximal magnitude of 1/2, i.e. the ⇤ spin, whereas the usual convention in particle physics has as maximal magnitude 1, i.e.…”