BCAL reconstruction 8/24/11

Summary

• BCAL reconstruction seemed to be an obstacle in b1pi events
• Two reconstruction algorithms in tree: KLOE algorithm=default, "new" algorithm by matt s.
• Found two issues which lead to poor energy resolution at low E (fixes not checked in yet)
• "New" algorithm seems to be doing well, at least for single-photon events
• Further fine-tuning needed, but maybe should wait until BCAL segmentation finalized?
• Further study of b1pi, etc.

BCAL Reconstruction algorithms

• KLOE algorithm: currently default
• GlueX algorithm: by Matt Shepherd "New" BCAL Reconstruction Algorithm
• GlueX+: Fixed a bug that prevent some hits from being considered, lowered energy threshold to "seed" cluster

Single photon event sample

Single photon efficiency (excluding events with tracking hits):

Energy resolution:

GlueX:

GlueX+:

Timing resolution: