Using the beam monte carlo (Phil was indispensable in supplying me a copy and helping me understand how it works--thanks, Phil!), I have separated out the set of events which have apparent photon energy between 225 and 275 GeV. "Apparent photon energy" is the energy in the silicon minus the energy given by the RESH hit pattern. I binned up these events by the energy of the lead photon at our target. Bins are 10 GeV wide. I then used this as the front end for Twister and Lucifer, initializing for each bin of lead photon energy and throwing the number of events indicated by the beam monte carlo.
Pages 1-2 show the number of events I threw in each bin and the number of events that triggered in each bin. Pages 3-4 simply divide the number that triggered by the number thrown for each bin. Triggering is only determined by satisfying global and/or two-high triggers. No jetfinding is done (although this will be added in short order). Again, let me emphasize that this is only for the set of events that have apparent energy 225-275 GeV.
Plots are given using inline jpegs. You wiil need to use a later generation browser to see them. Let me know if you have any trouble.
Page 1: Twister: Thrown and triggered spectrum.
Page 2: Lucifer: Thrown and triggered spectrum.
Page 3: Twister: Trigger efficiency
Page 4: Lucifer: Trigger efficiency
The next step is to throw the full beam spectrum regardless of apparent energy and see if we can reproduce the triggered beam spectrum we see in the data.
Update: As yet, we do not reproduce the triggered beam spectrum when simulating the full beam spectrum. There are too many low beam energy triggers.
On a different topic, we are getting close to recommending a cut and a correction. Both of these directly address the multiple brem question. See the following (which include inline gifs):
Energy Loss: A cut on missing energy
BCAL EM Energy: A correction to photon energy
Greg Morrow morrow@physics.rice.edu