Comprehensive Analysis on Truth Vertexing at CEPC: Jet Matching, Performance, and More
This content provides a detailed examination of truth vertexing at the Circular Electron Positron Collider (CEPC), covering topics such as jet matching performance, energy resolution, vertex distances, and track ratios. The findings and data presented offer valuable insights into particle physics research and experimentation strategies.
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Presentation Transcript
Truth Vertexing at CEPC Wang Xinzhu, Wu Jingfei, Zhang Chenguang, Zhu Yifan Wang Tao, Huan Yanping
Truth matching idea Jet Reconstructed: clustered PFOs Truth: clustered MCP (charged + neutral & stable) Vertex Reconstructed: tracks (charged PFO) Truth: vertex of charged stable MCP MCP collection clustering match constituent truth reconstructed truth vertex 2025/4/15 2
Jet matching performance ee->bb @ 91.2GeV Match jet by R Performance cut @ 0.4 eff: 98% 2025/4/15 3
Jet vars R < 0.4 Energy resolution: ~9% Charged track counts match well 2025/4/15 4
First secondary vertex vars Match reco/truth vertex with highest energy Select matched vertices with distance(rec, truth) < 20mm ~3% shift from reconstructed vertices 2025/4/15 5
First secondary vertex vars Vertex distance to IP More reco vertices close to IP 2025/4/15 6
First secondary vertex vars Vertex N tracks Reco vertex tend to have ~1 more track 2025/4/15 7
First secondary vertex vars Leading pT of the hardest vertex Select vertices with distance(rec, truth) < 20mm Good agreement 2025/4/15 8
First secondary vertex vars Sub-leading pT of the hardest vertex Select vertices with distance(rec, truth) < 20mm Good agreement 2025/4/15 9
First secondary vertex vars Ratio of tracks from reco vertex matched to correct MCP in the truth vertex Ratio = (tracks matched to correct MCP)/all tracks No tracks in hardest reco vertices matched to MCPs from truth: ~28% 2025/4/15 10
