Explanation of ROOT tree leaves
From GlueXWiki
An excerpt from a December 12, 2006 email from David Lawrence:
Here are some brief explanations:
adcN, adcS, adcsum:
These are pedestal subtracted ADC values for the BCAL
tdcN, tdcS:
These are TDC values converted to nanoseconds and with individual channel offsets subtracted for the BCAL. The offsets were derived from cosmic run 2252. To make any sense, I believe you would need take the difference of one of these values with another timing signal.
trig:
This is the trigger latch. Each of the first twelve bits corresponds to the 12 triggers we used.
Ntdctrig, tdctrig, tdctrigid:
These hold the TDC values for the trigger. Ntdctrig is the number of values in the tdctrig and tdctrigid arrays. The tdctrig values are in nanoseconds. One should be the event causing trigger and should be used as the reference to subtract from the tdcN and tdcS values. The event causing trigger should be the one whose corresponding tdctrigid is the bit set in the trig word.
Nphotons, tphoton,Ephoton:
Reconstructed photons in tagger. The times are in nanoseconds. Unlike the BCAL TDC values, I believe these already have the reference time subtracted. They should peak at around 600 ns if I remember right.
veto, tveto:
ADC and TDC values for the veto paddle. ADC is in ADC counts, but pedestal subtracted. TDC is in nanoseconds, but does still needs the reference time subtracted like the BCAL TDCs.
I hope this helps.
Regards, -David