Here are more checks on the FMS simulation with the MB data set that Akio provided.

First let's look at the photon reconstruction.

If we require reconstructed photons are matched to a simulated photon, and the photon is one cell away from the edge, then we are looking at photons that are relatively clean.

Reconstructed position y - simulated. Horizontal axis is cell size in unit. The reconstructed y is centered around simulated y.

Reconstructed position x - simulated. Resolution is similar to that of x, however there is a shift in the reconstructed position and the distribution is skewed.

Distance between reconstructed and simulated photon.

Photon energy resolution. (there is a 4.5% correction of tower energy deposition, was 8%) Energy resolution is 1-3% depending on energy.

Below is the cluster sigmaMax distribution. At photon energy great than 40 GeV, we can see the seperation between one-photon and two-photon clusters.

Below are the two-photon invariant mass distribution.

Two-photon invariant mass distribution where both photons are matched to a geant photon.

Two-photon invariant mass distribution where both photons are matched to a geant photon, and the reconstructed Pi0 is matched to a simulated Pi0.

Two-photon invariant mass distribution where both photons are NOT matched to a geant photon. There are some funny structures.

In the case where both photons are matched to a geant photon, and the reconstructed Pi0 is matched to a simulated Pi0, we can look at Dgg and Zgg. Below is reconstructed Zgg - simulated.

Reconstructed Dgg - simulated.

Pi0 energy resolution. Reconstructed Pi0 energy is shifted upward with ~2% resolution.