Here are some results from the pairproduction run 4865. In the figures, I am showing the TDC difference between the top and bottom TDCs of a single counter(left). In the right plot, I am showing the raw ADC for the top pmt versus the bottom pmt. The black dots are with no cuts and the red dots are counts after the TDC thresholds.
These are the results for the 2nd counter to the right of the beamline.
These are the results for 1st counter to the right of the beamline with the notch cut out for the beam. The B-field of the PS magnet is sweeping out most of the pairs so they should not hit this counter.
Next, I analyzed run 5353 with photon beam directed on the middle of HYCAL. I selected the first 50000 events in the file so the beam was only incident on counter 10.
Here is TDC difference for the beam on counter 10.
Here is TDC difference for counter 9 while the beam was on counter 10.
Here is overlay of the background in counter 9(red) on the events from counter 10(black).
Next, I analyzed run 5376 with photon beam directed on the top of HYCAL. I selected the first 50000 events in the file so the beam was only incident on counter 10.
Here is TDC difference for the beam on counter 10.
Here is TDC difference for counter 9 while the beam was on counter 10.
Here is overlay of the background in counter 9(red) on the events from counter 10(black).
