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Output
Seamus Riordan edited this page Jan 7, 2014
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##Coordinate systems:
###Hall
| +z | is down the nominal beam axis |
| +y | is "up" (away from gravity) |
| +x | makes a right handed coordinate system |
###Detectors
| +z | is nominally down the "central axis" in the particle direction |
| +x | is "down" (into the floor) |
| +y | makes a right handed coordinate system |
##ROOT file output structure
| ev.* | |
|---|---|
| count | Counts given the beam time/luminosity |
| rate | Counts per second given luminosity |
| solang | Integrating over this variable will give solid angle |
| sigma | Cross section [cm^-2] |
| W2 | Invariant mass squared [GeV^2] |
| xbj | Bjorken-x |
| Q2 | Q2 [GeV^2] |
| th | Polar angle of electron with zaxis [rad] |
| ph | Azimuthal angle of electron with zaxis [rad] |
| Aperp | perp component of asymmetry |
| Apar | parallel component of asymmetry |
| vx,y,z | Vertex position [cm] |
| ep | Scattered electron momentum [GeV] |
| np | Scattered nucleon momentum [GeV] |
| epx,y,z | Lab components of electron momentum [GeV] |
| npx,y,z | Lab components of nucleon momentum [GeV] |
| nth | Polar angle of nucleon wrt z-axis [rad] |
| nph | Azimuthal angle of nucleon wrt z-axis [rad] |
| pmperp | Missing momentum perp-component [GeV] |
| pmpar | Missing momentum par-component [GeV] |
| nucl | Nucleon when scattering type, 0 for neutron, 1 for proton |
| fnucl | Final nucleon type (pion prod may change flavor), 0 for neutron, 1 for proton |
| tr.* | |
|---|---|
| x | Track x coordinate intercept with z= 0 plane [m] |
| y | Track y coordinate intercept with z= 0 plane [m] |
| xp | Track dx/dz |
| yp | Track dy/dz |
| tx,ty,typ,txp | "True" track variables defined by track projection at first chamber |
| hcal | 0 if no hit in HCAL, 1 if hit |
| bb | 0 if no hit in BB cal, 1 if hit |
| gemtr | 0 if no track found in GEMs, 1 if track found |
| hcx | HCAL x hit position [cm] |
| hcy | HCAL y hit position [cm] |
| bcx | BB cal x hit position [cm] |
| bcy | BB cal y hit position [cm] |
| hct | HCAL time-of-flight [ns] |
| hctex | HCAL expected time-of-flight from momentum-transfer [ns] |
| hclx,y,z | HCAL hit position in lab coordinates [cm] |
| hcdang | HCAL angular difference between q and nucleon p [rad] |
| gen.* | |
|---|---|
| thbb | BigBite angle [rad] |
| thhcal | HCAL angle [rad] |
| dbb | BigBite distance from target [m] |
| dhc | HCAL distance from target [m] |
| Ebeam | Beam energy [GeV] |
| ht.* | |
|---|---|
| ndata | Number of hits in ht.* array |
| gid | GEM ID (counting starts at 1) |
| x,y,z | GEM hit position (incl. resolution effects) [m] |
| dx,dy | dx/dz and dy/dz of track at hit |
| tx,ty | "True" GEM hit position (perfect resolution) [m] |