SM: Got sigma of 2.7 GeV at the Zpole after tuning up pflow algo.
(slides)
Photons from hmatrix.
Neutrals are leftovers.
Distribution is symmetric. (usually not) Fit with double gaussian.
Photon finder was not picking up the tail of the photons. Wanted to modify fixed cone to use instead.
To find photons, just allow NN to skip some layers.
MC: Not really an 80/20% split on the 2 gaussians.
RC: What were parameters for finding photons using NN?
SM: Looking...
MC: Which detector?
SM: cdcaug05, because RPCs are difficult to work with for this application.
SM: Distance 2 & 2 in transverse dimension. ~Moliere radius. Number of layers = 5.
No hits in tail, because missing hits a few layers away.
Min # cells = 8.
10 cell clusters into hmatrix and used for photons.
Ratio of E_cluster/E_actual. Apply 1.04 E correction.
RC: For neutrals, did do clustering, not just take all the hits and use their energy?
SM: Yes, use the cluster energy. Calculate the energy by using a different sampling fraction in the ecal. Similar to hits vs. energy as done by RC. Number of hits sampling fractions for ecal hits, e.g. GeV/hit.
Allow to go across ~20% of hcal to find clusters.
For ecal, use 7 layers for the hadrons. Reclustered with different parameters after removing photon clusters and MIP hits.
NG: Work on cheater from MR?
MR: Amazed at SM's results with Z jets.
Developing cheater using tracking and cluster cheater for perfect event reconstruction.
Switches to allow mixin of reconstructed particles with MCParticles.
Reconstruction for W's at 500 GeV with mass resolution ~3.7 GeV. Worse than SM's results with actual clusters.
NG: What jet finding?
MR: JadeE.
NG: Floating kT to get cuts? (???)
MR: Yes.
Useful for reconstructing jets.
Few options for energy measures. In hcal, parameterized or digital/analog calorimeter.
Confluence page.
Maybe compare with results SM is getting.
SM: "Cheating" means cheating everything?
MR: Yes.
SM: This is the blue curve in the plot.
Cheating on tracks.
Makes reconstructed particles -> jets.
Needs to be tuned.
NG: Updates from RC?
RC: No writeup, yet.
Compare clusterers and show "how you're doing". Close to a general package.
Hopefully, next week will have a writeup.
SM has parameters for NN clusterer. Would like to see if get these results.
Compare with fixed cone for energy and # of hits. (purity and efficiency)