(a): Enhancement of $\Phi$, $\Lambda$, $\Xi$, and $\Omega$ in Pb-Pb collisions at $\snn$ = 2.76 TeV calculated using pp reference yields (extrapolated for $\Lambda$, interpolated for $\Phi$, $\Xi$, and $\Omega$). Also shown is the enhancement of the $\Phi$ in Au-Au collisions at $\snn$ = 200 GeV, calculated using a measured pp reference yield. The enhancement value reported here is the ratio of the yield (${\rm d} N/\rm d y$) of a particle in A-A collisions to the yield of that particle in pp collisions at the same energy, with both the numerator and denominator normalized by $\langle N_{part} \rangle$. The two most central $\Phi$ enhancement values for Au-Au collisions are for overlapping centrality intervals (0-5\% and 0-10\%). Bars represent the uncertainties in the \ada yields (including centrality-uncorrelated and centrality-correlated components), while the boxes at low values of $\langle N_{part} \rangle$ represent the uncertainties of the pp reference yields. The $\Phi$ and $\Lambda$ measurements at $\langle N_{part} \rangle$=7.5 have been shifted horizontally for visibility. (b): Ratios of particle yields to charged pion yields for Pb-Pb collisions at $\snn$ = 2.76 TeV, Au-Au collisions at $\snn$ = 200 GeV, and pp collisions at $\sqrt{s}$ = 200 GeV, 900 GeV, and 7 TeV. The lines show ratios given by grand-canonical thermal models with temperatures of 170 MeV (upper dashed lines), 164 MeV (solid lines), and 156 MeV (lower dashed lines). The total uncertainties (including centrality-uncorrelated and centrality-correlated components) are shown as bars. Some of the measurements at $\langle N_{part} \rangle$=2 have been shifted horizontally for visibility. The two most central $\Phi/\pi$ values for Au-Au collisions are for overlapping centrality intervals (0-5% and 0-10%). | |