Figure 8

Transverse-momentum distributions of $\rm K^{*0}$ and $\Phi$ resonances in Pb-Pb collisions at $\snn$ = 2.76 TeV along with expected distributions for central (a) and peripheral (b) collisions. The shapes of the expected distributions are given by Boltzmann-Gibbs blast-wave functions using parameters obtained from fits to $\pi^{\pm}$, $K^\pm$, and (anti)proton $\pt$ distributions. The expected distributions are normalized so that their integrals are equal to the measured yield of charged kaons in Pb-Pb collisions multiplied by the $\rm K^{*0}/K$ and $\Phi/\rm K$ ratios given by a thermal-model fit to ALICE data. The lower panels show the ratios of the measured distributions to the values from the model. The statistical uncertainties are shown as bars and the systematic uncertainties from the measured $\pt$ distributions (including $\pt$-uncorrelated and $\pt$-correlated components) are shown as boxes. The shaded bands (upper panels) and shaded boxes (lower panels) indicate the uncertainties in the normalization of the model distributions.