The following pictures have been created with the event visualization tool
prism which is part of the standard HERA-B reconstruction
and analysis software. The main intention behind prism is to visualize the level to which the
detector is implemented within the geometry description, as well as the Monte Carlo generated
events (if any), the detector signals and the reconstructed objects. The following displays show Monte Carlo
events generated with Fritiof/Pythia and traced with the standard HBGEAN simulation tool.
B0 with and without underlying event
Two pictures on one sheet, visualizing the maze of tracks underlying the golden B decay.
Golden B decay with tracking system in trimetric perspective view. The underlying event is
Frog's view of tracking system with RICH and SiVD support mounts. The stereo planes of main
tracker and muon system are suppressed.
Primary vertices are visible in front of the Silicon vertex detector. This is a less crowded
HERA-B event, with only two superimposed interactions.
Detail from the honeycomb drift chambers of the Outer Tracker. The green hexagons
are sections of the vertical honeycomb drift tubes. The blue circles correspond to the
drift distance isochrones simulated by the HBGEAN digitization package.
Pattern recognition in the Outer Tracker. This file contains two pictures:
the first picture shows - in a closeup from the outer tracker - the drift-distance
isochrones of the zero-degree layers (small blue circles), the Monte Carlo tracks
(red lines) and the reconstructed tracks found by the track reconstruction program
'ranger'. The second picture shows only the detector signals, for comparison.
Perspective view of electromagnetic calorimeter and muon system (absorber
plates are not shown).
Last change: 28-Jun-96 RM