the experimental data [@Adams:2004cb] and find a very good agreement between these two. In our calculation, we take the same centrality bins as used in the calculation of particle ratios at this energy. $E_{T}/N_{ch}$ is almost independent of centrality except at lower centrality bins with the participant number less than 100. The present model explains the data well except at a lower $N_{part}$. We also show the obtained results with collective flow which explains the data within the experimental errors.

![The variations of hadron ratios for Pb-Pb collisions with respect to $N_{part}$ at $\sqrt{s_{NN}}$ = 2.76 TeV. Symbols show the experimental data [@Abelev:2013vea] and lines are our model results.](all_2760.pdf){height="25em"}

Figure 4 represents the centrality dependence of various hadrons ratios for Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. To calculate the particle ratios with respect to $N_{part}$, we relate T and $\mu_{B}$ with $N_{part}$ at this energy. Once we get the variations of freeze-out parameters with $N_{part}$, we calculate various particle ratios. While calculating ratios with respect to $N_{part}$, we select three centrality bins in our model with participant numbers 382$\pm$17 (most-central), 128$\pm$16 (mid-central), and 7$\pm$4 (peripheral). Again, we take $\gamma_{s}$ equal to one over all the centrality for the sake 