This is a description of the initial ntuple Benoit defined from the beamline simulation step. Until this is absorbed into a beamtest tuple, SLAC farm-generated have the beam tuple merged with merit.
 

 Quantity

Description

e_silicon[4]:

 energy deposited in the silicon strip detectors in MeV.
                0,1: detectors in front of the magnet
                2,3: detectors behind the magnet

positionx[4]:

positions along the beam axis of the 4 silicon detectors in mm.

 positiony[4],positionz[4]

 transverse positions measured by the silicon detectors in mm. y is horizontal, z is vertical

 eg_tot

 sum energy of gamma-rays in MeV

ee_tot 

sum energy of electrons in MeV

 eg_1

 energy of highest-energy gamma-ray in MeV

 eg_2

 energy of second highest-energy gamma-ray in MeV

ee_1 

energy of highest-energy electron in MeV

ee_2

energy of second highest electron in MeV

 M_gam

 number of gamma-rays with E > 20 keV

M_e 

number of electrons with E > 20 keV

 E_rec

 reconstructed energy of the electron in MeV using the initial/final angles of the trajectory with respect to the beam axis

 dir_rec_x,y,z

 projections of gamma-ray "reconstructed" direction,
assumed to be the initial electron direction (as measured with detectors 0 and 1).

E_annihilator 

Energy deposited in the Annihilator (if no annihilator in the run, set to 0)

E_dump

Energy deposited in the Dump (if no dump in the run, set to 0)

E_plastic0 

Energy deposited in the First Plastic Detector in the beam (useful to require an Energy deposit which corresponds to triggering plastic0)

E_plastic1 

Energy deposited in the Second Plastic Detector in the beam 2 cm away from the first (useful to require an Energy deposit which corresponds to triggering plastic1)

E_plastic2 

Energy deposited in the Veto Plastic Detector in the beam

E_posx, E_posy, E_posz 

Position of the highest and second highest electron arriving at the reporting plane (array of 2 doubles)

E_px, E_py, E_pz 

Momentum of the highest and second highest electron arriving at the reporting plane (array of 2 doubles)

Gam_posx, Gam_posy, Gam_posz

Position of the highest and second highest gamma arriving at the reporting plane (array of 2 doubles) 

Gam_px, Gam_py, Gam_pz

Momentum of the highest and second highest gamma arriving at the reporting plane (array of 2 doubles) 

E_si0, E_si1, E_si2, E_si3

Energy deposited in the first (si0), second (si1), third (si2), fourth (si3) silicon detector

E_vol0 

Energy deposited in the first volume (i.e. the Cherenkov volume in the case of PS and SPS runs)

E_vol1 

Energy deposited in the second volume (i.e. the second Cherenkov volume in the case of PS and the vacuum volume in the case of SPS runs)

E_win0, E_win1, E_win2, E_win3 

Energy deposited in the mylar windows around the first volume (E_win0 and E_win1) and the second volume (E_win2 and E_win3)

nPositrons 

Number of positrons arriving at the reporting plane (for the positron runs)

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