The so-called last layer corrections algorithm is being upgraded. The threshold energy will be lower with limited efficiency around 100 MeV but good resolution (below 10%).
The spatial coverage on the calorimeter is extended by taking into account the variation of deposited energies as a function of postion shift. This is illustrated below.
The previous version of this method used events well centered on the CALs and far enough from the edges. The coloured countours are the new areas taken into account now. The deposited energy in the CAL as a function of contour is shown below. One sees that the distributions can still be used as density functions (i.e. they peak) up to the most outlying contour which is smeared out.
