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Energy Resolution Analysis in Particle Production: Saminder Dhaliwal (2005)

This analysis presents the energy resolution of reconstructed and true energies in particle production at different energy ranges. Data from 50GeV to 150GeV energies are filtered based on jet characteristics. Approximately 10,000 filtered events are generated daily, utilizing 40GB/day. Expected daily electron production includes 52 electrons, with 4-5 having Pt > 20GeV. Results show variations in reconstruction and matching with truth values at different analysis stages. Further exploration of etcone and EoverP cuts is suggested, along with a comparison of isEM analysis with and without TRT.

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Energy Resolution Analysis in Particle Production: Saminder Dhaliwal (2005)

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  1. Full Production Analysis so far… Saminder Dhaliwal 24th August 2005

  2. Resolution Z-> e+ e- Formula: (Reconstructed E – True E) / (0.1)*(sqrt [True E])

  3. Resolution at different Energy’s 50GeV < E < 70GeV 40GeV < E < 50GeV 150GeV < E 70GeV < E < 150GeV

  4. RMS and Sigma

  5. Producution so far • Filtering events, asking for • Lead Jet Pt > 30GeV, Second Jet Pt > 15GeV and eta gap between jets > 3.0 • Generate about 10 000 events (with filters) daily • Using about 40GB/day • Expect about 52 electrons of which 4-5 have Pt > 20GeV to be generated daily.

  6. No Cuts Reconstruced: 1 317 437 Matched Truth: 855 811

  7. First Cut: Pt > 20GeV, and “hasTrack” Reconstruced: 87 971 Matched Truth: 74 680

  8. Second Cut: is egamma object Reconstruced: 13 890 Matched Truth: 11 595

  9. Third Cut: isEM with TRT Reconstruced: 179 Matched Truth: 154

  10. Fake rate

  11. Conclusions • Need to explore etcone and EoverP cuts further. • Compare isEM analysis with and without TRT

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