Difference between revisions of "PrimEx at GlueX"
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=== Simulation and Reconstruction === | === Simulation and Reconstruction === | ||
| + | |||
| + | === Input Format for Signal Events === | ||
| + | |||
| + | Signal events can be fed into the GlueX Monte Carlo using a simple ASCII format for the four vectors of each a event. Below is a sample event. | ||
| + | |||
| + | 9000 1 6 | ||
| + | 1 8 0.137 | ||
| + | 1 -0.33816 -0.199603 1.50846 1.56474 | ||
| + | 2 9 0.137 | ||
| + | -1 0.0592538 -0.0287174 0.270175 0.309998 | ||
| + | 3 7 0.135 | ||
| + | 0 0.125819 -0.0498192 0.20477 0.280122 | ||
| + | 4 8 0.137 | ||
| + | 1 -0.117507 0.288612 1.31965 1.36284 | ||
| + | 5 7 0.135 | ||
| + | 0 0.143892 -0.446216 5.27102 5.29355 | ||
| + | 6 13 0.93926 | ||
| + | 0 0.126703 0.435744 0.425928 1.12674 | ||
| + | |||
| + | Where the format is: | ||
| + | |||
| + | run event no_particles | ||
| + | particle_index particle_id mass | ||
| + | charge px py pz E | ||
| + | |||
=== Output Data File Format === | === Output Data File Format === | ||
Revision as of 11:29, 4 August 2008
There is an interest in continuing the PrimEx physics program with the GlueX detector with the 12 GeV beam. One can find links to meetings and minutes for a series of GlueX and PrimEx meetings here.
Contents
Physics Topics
- Measurement of the γγ width of the η and η' using Primakoff Production
- Measurement of rare η decay branching fractions
Monte Carlo Studies
Rare η decays
η Primakoff
Simulation and Reconstruction
Input Format for Signal Events
Signal events can be fed into the GlueX Monte Carlo using a simple ASCII format for the four vectors of each a event. Below is a sample event.
9000 1 6 1 8 0.137 1 -0.33816 -0.199603 1.50846 1.56474 2 9 0.137 -1 0.0592538 -0.0287174 0.270175 0.309998 3 7 0.135 0 0.125819 -0.0498192 0.20477 0.280122 4 8 0.137 1 -0.117507 0.288612 1.31965 1.36284 5 7 0.135 0 0.143892 -0.446216 5.27102 5.29355 6 13 0.93926 0 0.126703 0.435744 0.425928 1.12674
Where the format is:
run event no_particles particle_index particle_id mass charge px py pz E
Output Data File Format
The reconstructed and analyzed data events are written out in a ROOT tree with the name "event". The tree contains several series of variable length arrays. A description of the entries appears below:
- n: The number of reconstructed photons in the FCAL
- E[n], px[n], py[n], pz[n]: The four momentum of the nth reconstructed photon
- neuETot: The total reconstructed energy in the FCAL
- M: The invariant mass of all FCAL photons
- genNeuETot: The total generated energy of all η's, π0's; γ's, electrons, and positrons.
- nNeuGen: The number of generated neutral particles
- genNeuE[nNeuGen], genNeuPx[nNeuGen], genNeuPy[nNeuGen], genNeuPz[nNeuGen]: The four momentum of the nNeuGenth generated neutral
- neuType[nNeuGen]: The GEANT particle type of the nNeuGenth particle
- nChGen: The number of generated charged particles
- genChE[nChGen], genChPx[nChGen], genChPy[nChGen], genChPz[nChGen]: The four momentum of the nChGenth generated neutral
- chType[nChGen]: The GEANT particle type of the nChGenth particle
