Difference between revisions of "PrimEx at GlueX"

Revision as of 11:23, 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.

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

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