Solenoid Current Studies

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Revision as of 13:28, 4 June 2014 by Mstaib (Talk | contribs) (PYTHIA samples)

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This page will serve as a collaborative workspace for groups studying the effects of the reducing the solenoid current. Details of the simulation, as well as results of the analysis can be shared here.

Existing Studies

The effect of a decreased solenoid current on \omega reconstruction has been examined in some detail in [GlueX Doc 1429]. It may be useful to reproduce this study with the latest reconstruction.

Useful Links


The following channels were suggested at the May 2014 collaboration meeting (see document). Details of the progress of the analyses can be included below. This can include genr8/HDGEANT input files, JANA plugins used for the analysis, results...

Skim/Analysis Cuts


  1. Individual Tracking FOM 3 sigma (instead of combined: just seems more intuitive).
  2. Has-detector-match (DCutAction_AllTracksHaveDetectorMatch).
  3. Individual Neutral PID FOM 5-sigma (DCutAction_PIDFOM).
  4. If no missing particle, cut on transverse momentum at 400 MeV/c (DCutAction_TransverseMomentum)


  1. Kinematic fit converges (DCutAction_KinFitFOM with cut value of 0.0).

It seemed like the PID cuts on charged particles (e.g. 5-sigma w/o BCAL) were cutting away too much "signal," although some of that signal might have been ghost tracks. Before cutting on it, you'd want to do some studies to see how many combos that contain tracks with low PID confidence actually pass kinematic fit or BDT cuts.

Everything else should probably be left to the BDT.

PYTHIA samples

The data used for the analysis is extracted from PYTHIA generated samples. For the initial studies, 10M events will be generated for the non-DC2 runs. The run number scheme is the following:

PYTHIA Run Specifications
Run Number Magnetic field map EM background rate Notes
9001 1350A 1.1E7 Standard DC2 production
9002 1350A 5.5E7 Standard DC2 production
9003 1350A none Standard DC2 production
9004 1500A 1.1E7 10M events generated at CMU
9005 1500A 5.5E7 10M events generated at JLab
9006 1500A none
9007 1200A 1.1E7 10M events generated at CMU
9008 1200A 5.5E7 10M events generated at JLab
9009 1200A none

The REST files and the ROOT files produced from runs 9004-9009 can be retrieved from the following directory:


genr8 phase space samples

Failed to parse (lexing error): \gamma \, p ≈ \rightarrow p \, X(2000) \, \rightarrow p \, \omega \, \pi^{+} \, \pi^{-}

  • Run Number: 7001

\gamma \,p\rightarrow p\,X(2000)\rightarrow p\,\eta \,\pi ^{{+}}\,\pi ^{{-}}

  • Run Number: 7002

\gamma \,p\rightarrow n\,X^{{+}}(2000)\rightarrow n\,\pi ^{{+}}\,\pi ^{{+}}\,\pi ^{{-}}

  • Run Number: 7003

\gamma \,p\rightarrow p\,Y(2170)\rightarrow p\,\phi \pi ^{{+}}\,\pi ^{{-}}