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DP: did you mention this will only work if the 2 thresholds are more or less equal? why?
AC: if difference is too big you just do not see the threshold as it never shows up
BT Analysis memo
MNM: I am concerned that the recent improvements change the hadronic physics list studies
EB: good idea to do this, there should be a section on continuing issues
JB: something to be well understood is that this is not the end of the analysis, but to provide the status to the collaboration
LL: true, but we should refrain from the temptation of writing a 100 pages memo which just collect existing material (very easy to do). we need to provide complete and concise information that could go into a paper, that we need as a reference to support our strategy for calibrating the LAT with extensive use of MC. We can expand an internal memo with more details, but we should not forget we are aiming at a paper. So we will have to redo a lot (if not all) of the studies that are listed here, including hadronic phisycs studies, not sure we can redo everything, but it is important that we reprocess data, generate udpated simulations, rely on existing BtSysTest and analysis to remake the most and finally make the effort to summarize for the benefit of the collaboration and for getting to a paper
EB: about the LPM effect, it is definitely something that we should see, so just disabling it is not good, and as you see from johan's plots it really makes a big effect. is there a way to put pressure on g4 developers to re-implement correctly the LPM effect? do we have any estimate on when this is done?
JB: they work under no pressure, if you really want it, they would say just reimplement it yourself
LL: what was the story with the multiple scattering bug? did we have somebody from our side to reimplement it correctly?
LSR: for the multiple scattering we got back to an old working implementation, I do not think this is possiblefor the LPM, we have no evidence that it ever worked. Johan, there are several effects in the LPM, do you know if G4 people plan to work on all of them?
JB: please send me an email with details and I will fwd it to Vladimir to check about his plans