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ELoss cuts in straw tubes [message #14436] Fri, 08 February 2013 17:45 Go to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: *
Dear all,
I did a check on the straw tube occupancy, in order to understand if a cut on a minimum energy loss value (i.e. 20 eV) could affect (and how) the rates.
This is due to the fact that in simulation the energy loss in straw tubes can assume also very low values, few eV, where in theory no electronic signal should be created.

For this check I simulated 10k DPM events at 15 GeV/c, full setup, and checked the tube ID distribution of the points with eloss < 20 eV, separately for STT and FTS:





On Y axis you can see the fraction of points with eloss < 20 eV divided by the total amount of points, in percentage.

You can see that while for the barrel the "fake" ratio is well below 0.1%, in forward (most probably due to more material around) the ratio reaches 0.5%.

Just for your information.
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