This block is made by the module
CalNadaAnalyzeDig
in package cal_nada_analyze.
It loops over calorimeter cells
and store informations about these cells in the Global root-tuple.
This block has been modified in
versions V01-01-03 (and p11-br-03) of the package.
These modifications will be taken
into account in releases : t02.10.00
and p11.04.00.
Here is a description of the variables stored in the block before and after modification.
For all cells of the caldata chunk the following variables are given :
(note that the cells killed by nada are still present in the chunck
but with an energy set arbitrarily to 1 MeV)
| Old CAL block | New CAL block | ||
| Variable name | Descritpion | Variable name | Description |
| ncal | number of cells in an event | ncal | number of cells in an event |
| - | xVtx | X coordinate of the vertex of the event | |
| - | yVtx | Y coordinate of the vertex of the event | |
| - | zVtx | Z coordinate of the vertex of the event | |
| e_cal | cell energy | e_cal | cell energy |
| pt_cal | Transverse momentum assuming a vertex at (0,0,0) | ptV_cal | Transverse momentum calculated with respect to the vertex of the event in X, Y and Z |
| ieta_cal | ieta of the cell | ieta_cal | ieta of the cell |
| iphi_cal | iphi of the cell | iphi_cal | iphi of the cell |
| ilyr_cal | layer of the cell | ilyr_cal | layer of the cell |
| - | etaV_cal | eta of the cell calculated with respect to the vertex of the event in x, y and z | |
| - | phiV_cal | phi of the cell calculated with respect to the vertex of the event in x, y and z | |
| - | xV_cal | X coordinate of the cell calculated with respect to the vertex of the event in x, y and z | |
| - | yV_cal | Y coordinate of the cell calculated with respect to the vertex of the event in x, y and z | |
| - | zV_cal | Z coordinate of the cell calculated with respect to the vertex of the event in x, y and z | |
With the variables xV_cal, yV_cal, zV_cal and xVtx, yVtx, zVtx one can have access to the x, y and z coordinates of the cell assuming a vertex at (0,0,0) and hence, the phi, theta and R variables of a cell in detector coordinates, and the PT of a cell calculated without vertex :
xcell = xV_cal + xVtx
ycell = yV_cal + yVtx
zcell = zV_cal + zVtx
R
= sqrt(xcell**2 + ycell**2 + zcell**2)
phi = atan(ycell/xcell)
theta = acos(z/R)
PT = e_cal*sin(theta)