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g4sbs Seamus Riordan riordan@jlab.org July 31, 2013 Build using the standard cmake facilities. CTEQ tables built in automatically for DIS If you would like to get on a mail notification list, contact Seamus (riordan@jlab.org) *IF YOU ARE DOING DEVELOPMENT, PLEASE DO NOT WORK IN THE master BRANCH* You need the BigBite field map for this as well, which can be found http://hallaweb.jlab.org/12GeV/SuperBigBite/downloads/map_696A.dat To build: mkdir build cd build cmake ../g4sbs # see below if you get an error about old versions make To run: ./g4sbs run_example.mac run_example.mac demonstrates most of the features by example # NOTE: On the JLab farm, a newer version of cmake is available # So, if it complains about being too old, try: /apps/cmake/bin/cmake ../g4sbs ######################################################### Coordinate systems in hall: +z is down the nominal beam axis +y is "up" (away from gravity) +x makes a right handed coordinate system Coordinate systems for 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 ######################################################### Hits in the GEM chambers have tracking performed on them doing straight line fits with resolutions. At the moment tracking is done in a very dumb way for simplicity! It will end up averaging all the hits together if there is more than one track. It would be wise to ensure that tr.nhit <= 4 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]
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