Difference between revisions of "Photon Reconstruction 07/16/2012"
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| Line 1: | Line 1: | ||
| − | + | ===Problem=== | |
| + | Even after timing cuts, still have large background under pi0 peak. | ||
[[File:2gamma.invariantmass.b1pi.png]] | [[File:2gamma.invariantmass.b1pi.png]] | ||
| − | + | ===Splitoffs?=== | |
* [[Splitoff_Information | Splitoff suppression in Crystal Barrel, CLEO]] | * [[Splitoff_Information | Splitoff suppression in Crystal Barrel, CLEO]] | ||
** Various discriminators to distinguish between splitoffs, photons | ** Various discriminators to distinguish between splitoffs, photons | ||
| Line 9: | Line 10: | ||
*** Energies of parent and splitoff | *** Energies of parent and splitoff | ||
*** E9/E25 [[File:E9.E25.png|50px]] | *** E9/E25 [[File:E9.E25.png|50px]] | ||
| − | *** Left-right/up-down asymmetry | + | *** Left-right/up-down asymmetry [[File:Fcal.asym.png|50px]] |
** Feed this into a neural net to determine splitoff probability | ** Feed this into a neural net to determine splitoff probability | ||
| − | ** | + | ** Alternate FCAL clustering to minimize splitting of hadronic showers (naive algorithm just to group together neighboring hits) |
| + | |||
| + | ===BCAL?=== | ||
| + | |||
| + | ===What's next=== | ||
| + | Better understand origin of these extra clusters. | ||
Latest revision as of 11:07, 16 July 2012
Contents
Problem
Even after timing cuts, still have large background under pi0 peak.
Splitoffs?
- Splitoff suppression in Crystal Barrel, CLEO
- Various discriminators to distinguish between splitoffs, photons
- Distance/angle between potential parent cluster and potential splitoff
- Energies of parent and splitoff
- E9/E25
- Left-right/up-down asymmetry
- Feed this into a neural net to determine splitoff probability
- Alternate FCAL clustering to minimize splitting of hadronic showers (naive algorithm just to group together neighboring hits)
- Various discriminators to distinguish between splitoffs, photons
BCAL?
What's next
Better understand origin of these extra clusters.
