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Re: TPC dE/dx [message #11562 is a reply to message #11560] Tue, 08 March 2011 17:16 Go to previous messageGo to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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From: *to.infn.it
Felix Boehmer wrote on Tue, 08 March 2011 17:03

Hi
Just some comments:
The cluster amplitude is defined after the FrontEnd and given in ADC channels! It is calculated from the analogue signal amplitude (on the pad) using some parameters: ADC_amp = Sig_amp /(adcmax/adcmaxcount) (See PndTpcFrontend).



Ok, now I understand why the numbers do not match.

Quote:


You have to be very careful when defining the dx - a lot of effects are at work here (clustering!). The best approach is to use the actual track fit, as it is done in the task that I sent you a while ago



I know, this was just the first test, but it seems somehow to work and it is very fast. Using track extrapolation would improve a bit the resolution (even if I would not aspect huge improvements), but it will take much more computing time. I will see if I will be able to implement this updated version, however at least we have now a starting point working with PndTrack/PndPidCandidate.
 
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