Constant Term Evolution with Lead Plate Thickness Fluctuations in EM Module 0

We report on the results of the Monte Carlo simulation of the module 0 electromagnetic barrel calorimeter. The impact of the thickness variations of the lead plates, which enter in the construction of the module 0, on the energy resolution constant term is presented. Using the real lead plates thickness data which have been used to build the module 0 we find, at $\eta=0.3$ and $\eta=1.1$, a constant term $C < 0.3 \$. The contribution to the constant term coming from lead thickness fluctuations is found to be respectively $C = 0.53 \frac{\sigma^{(5)}}{e_{th}}$ and $C = 0.44 \frac{\sigma^{(5)}}{e_{th}}$ at $\eta=0.3$ and $\eta=1.1$, where $\sigma^{(5)}$ is the standard deviation of the mean lead thickness averaged over 5 plates and $e_{th}$ is the nominal thickness of a single lead plate.