FWD Software

["Brandenburg, Daniel" <brandenburg.89 AT osu.edu>]

Hi All,

Last week a made a few more substantial improvements to the tracking, especially in full events (e.g. Pythia and low luminosity data). Some details for those interested below.

Locations:

Pythia: /gpfs01/star/pwg_tasks/FwdCalib/PROD/Pythia

• /gpfs01/star/pwg_tasks/FwdCalib/PROD/Pythia/pythia_dybg_vz0/
• /gpfs01/star/pwg_tasks/FwdCalib/PROD/Pythia/pythia_dy_vz0/
• /gpfs01/star/pwg_tasks/FwdCalib/PROD/Pythia/pythia_jet_nofilter_vz0/
• /gpfs01/star/pwg_tasks/FwdCalib/PROD/Pythia/pythia_JPsi_vz0/

Run22 Low Luminosity: /gpfs01/star/pwg_tasks/FwdCalib/PROD/forwardCrossSection_2022/04082025

Note: some are still running, but all should be done by today sometime. 

Tracking improvements:

• Modify Kalman filter to use sqrt formalism to ensure pos def con matrices even in numerically unstable regions
• Align reference planes with the direction of largest error for FST spacepoints
• Seed track charge based on curvature estimate using only the extremum points (e.g. beamline + outermost FST)
• Plots below show significant improvement in charge misid, momentum resolution, and mult dep efficiency 

Daniel Brandenburg

Assistant Professor

College of Arts and Sciences

Department of Physics

Ohio State University