Event Title

Long-lived Dark Photons: Generation, Triggering, and Reconstruction

Advisor(s)

Dr. Peter Dong; Illinois Mathematics and Science Academy

Discipline

Physical Science

Start Date

21-4-2021 10:05 AM

End Date

21-4-2021 10:20 AM

Abstract

Long-lived dark photons decay away from the initial particle collision location; thus, they fail all regular triggers, which dismiss vertices a certain distance from the center of the beam pipe. Since the resulting lepton jets are grouped closely together, we cannot perform isolation cuts either. To trigger the displaced lepton jets, we wrote a missing transverse energy trigger module with a threshold of >120 GeV, which finds the vertices from which the displaced lepton jets originate. We tracked the crossing between the helix of a lepton track and concentric cylinders of varying sizes around the beam pipe and calculated where the particles were closest to locate the displaced vertices. The overall trigger efficiency was 72.94%. We further examined what triggers produced the greatest acceptance by testing additional single, double, and triple muon and electron triggers on the lepton jet data samples

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Apr 21st, 10:05 AM Apr 21st, 10:20 AM

Long-lived Dark Photons: Generation, Triggering, and Reconstruction

Long-lived dark photons decay away from the initial particle collision location; thus, they fail all regular triggers, which dismiss vertices a certain distance from the center of the beam pipe. Since the resulting lepton jets are grouped closely together, we cannot perform isolation cuts either. To trigger the displaced lepton jets, we wrote a missing transverse energy trigger module with a threshold of >120 GeV, which finds the vertices from which the displaced lepton jets originate. We tracked the crossing between the helix of a lepton track and concentric cylinders of varying sizes around the beam pipe and calculated where the particles were closest to locate the displaced vertices. The overall trigger efficiency was 72.94%. We further examined what triggers produced the greatest acceptance by testing additional single, double, and triple muon and electron triggers on the lepton jet data samples