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ClusterID: Brief Update

On December 9, 2002, Gary R. Bower presented an update on the ClusterID eflow algorithm at SLAC. The demonstration featured top mass plots to showcase the algorithm's resolution, using e+e- to Z collisions at a 50 GeV beam energy in the SD detector. The presentation highlighted challenges in top reconstruction that affected resolution visibility. Evaluation metrics showed a Z mass width approximately double that of perfect reconstruction. The method achieved a 90% correct identification rate for gamma energy, but neutral had energy identification was less effective, revealing opportunities for improvements.

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ClusterID: Brief Update

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  1. ClusterID: Brief Update Gary R. Bower, SLAC Ron Cassell, SLAC Monday, December 09, 2002

  2. Review • ClusterID is a fully functional eflow algorithm. • At the NIU eflow meeting we showed top mass plots to demo the resolution of ClusterID. • The problems of reconstructing the tops detracted from ClusterID resolution demo. ClusterID - G.R.Bower

  3. New demo of ClusterID resolution • This time use e+e-  Z at 50Gev beam energy in the SD detector. • Will also show effect of gap between EM and Had cal. ClusterID - G.R.Bower

  4. In all three plots use FastMC for charged particles, assume pion mass. No neutrinos in any of the plots. In MCTruth, use MCParticles for neutrals. In PerfectClustering, use Cluster Cheater for neutrals. In ClusterID use “honest” recon of neutrals. Z mass reconstruction ClusterID - G.R.Bower

  5. Zmass at Zpole ClusterID - G.R.Bower

  6. ClusterID recon efficiency SD detector with no gap between EM and Had cals. ClusterID - G.R.Bower

  7. ClusterID recon efficiency SD detector with ~10cm gap between EM and Had cals ClusterID - G.R.Bower

  8. ClusterID Resolution Summary • Gives Z mass width ~twice the width of perfect recon. • Correctly IDs 90% of gamma energy. • Incorrectly IDs 6% of gamma energy. • Correctly IDs 66% of neutral had energy. • Incorrectly IDs 27% of neutral had energy. (27% goes to 42% misID with cal gap) • Many fun resolution improvement projects are possible – help is welcome. ClusterID - G.R.Bower

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