Explanation of ROOT tree leaves

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