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Improved Isolation Methods for Electron and Photon Identification in Particle Physics Experiments

This news article discusses advancements in isolating electrons and photons for particle physics experiments, focusing on adjusting definitions and cuts based on new studies by Zhijun Liang. The updated definitions include changes in ET bin, photon ET, and jet cut criteria.

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Improved Isolation Methods for Electron and Photon Identification in Particle Physics Experiments

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  1. news Zhijun Liang

  2. Electron isolation • From camilla and Feng that they actually using • Etcone30_NPV_pt correct <6GeV • Is everyone using the same isolation ?

  3. Last photon ET bin • Old definition: [100GeV, 500GeV] • New definition : [100GeV, 1000GeV] • Motivated by ATGC study by Liang .

  4. Jet definition • Anti kt 4 EM topo jets • Old cuts : • pT>25GeV • |JVF| >0.75 • New cuts: • pT>30GeV • Drop the JVF cuts

  5. Anti tight photon ID • Def1: fail at least 1 of 3 bits except Wtot and deltaE (nominal) Def2: fail at least 2 of 4 bits except Wtot • Def3: fail at least 2 of 5 bits

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