Difference between revisions of "FCAL Reconstruction in b1pi events 03/14/2012"
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This is mostly an update of [[FCAL Reconstruction in b1pi events 03/06/2012]], but using svn rev 8894, which includes [http://clasweb.jlab.org/websvn/prod/listing.php?repname=GlueX&path=%2Ftrunk%2Fsim-recon%2Fsrc%2F&rev=8886&sc=1 changes to the cluster to charged track matching code]. | This is mostly an update of [[FCAL Reconstruction in b1pi events 03/06/2012]], but using svn rev 8894, which includes [http://clasweb.jlab.org/websvn/prod/listing.php?repname=GlueX&path=%2Ftrunk%2Fsim-recon%2Fsrc%2F&rev=8886&sc=1 changes to the cluster to charged track matching code]. | ||
| + | |||
| + | 50,000 b1pi events. No EM background. | ||
| + | ===Thrown photons=== | ||
| + | |||
| + | [[Image:PhotonEvsTheta thrown FCAL Feb12.png]] | ||
| + | |||
| + | ===Reconstructed photons=== | ||
| + | (after vetoing cluster matched to charged tracks) | ||
| + | |||
| + | [[Image:PhotonEvsTheta recon FCAL.svn8894.png]] | ||
| + | |||
| + | ===Questions=== | ||
| + | * Why are so many "photons" reconstructed? How can we reduce this? | ||
| + | * What is the actual reconstruction efficiency? | ||
| + | * How many photons reach the FCAL without converting? | ||
| + | ** Efficiency for non-converting photons? | ||
| + | ** Can we recover converted photons? | ||
| + | * Energy resolution, etc. | ||
| + | |||
| + | ===1 GeV photon events=== | ||
| + | Mihajlo in GlueX-doc-823 (2007) says for 1 GeV photons: | ||
| + | * 37% photon conversion before FCAL | ||
| + | * 99.6% efficiency for photons that reach FCAL | ||
| + | * Taking into account single clusters from photons that converted close to the FCAL face, the overall photon reconstruction efficiency was estimated to be 77% | ||
| + | * 4% energy resolution at 1 GeV | ||
Revision as of 13:05, 14 March 2012
This is mostly an update of FCAL Reconstruction in b1pi events 03/06/2012, but using svn rev 8894, which includes changes to the cluster to charged track matching code.
50,000 b1pi events. No EM background.
Thrown photons
Reconstructed photons
(after vetoing cluster matched to charged tracks)
Questions
- Why are so many "photons" reconstructed? How can we reduce this?
- What is the actual reconstruction efficiency?
- How many photons reach the FCAL without converting?
- Efficiency for non-converting photons?
- Can we recover converted photons?
- Energy resolution, etc.
1 GeV photon events
Mihajlo in GlueX-doc-823 (2007) says for 1 GeV photons:
- 37% photon conversion before FCAL
- 99.6% efficiency for photons that reach FCAL
- Taking into account single clusters from photons that converted close to the FCAL face, the overall photon reconstruction efficiency was estimated to be 77%
- 4% energy resolution at 1 GeV
