Complete Simulation Analysis for CEPC LLP Study Channels
Explore the detailed simulation analysis of 2-lepton and 2-electron channels in the CEPC LLP study. Investigate signal events, background events, track efficiencies, PFO energies, and more. Understand the comparison between signal and background scenarios for a comprehensive analysis.
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Presentation Transcript
CEPC LLP Study: 2-lepton channel full simulation analysis Ziyang Sun, Xiang Chen Zhengzhou University, Shanghai Jiao Tong University 2025-03-27 2025/4/19 1
2-electron channel full simulation analysis The version of CEPCSW is tdr25.3.6, and it doesn t have Final PID, only CyberPFO information. Signal: ee -> HZ, Z-> , H->X1,X2, X1->ee, X2 -> Signal events: 80,000, MX1,2: 10 GeV Background: ee -> ee Background events: 20,000 2025/4/19 2
Number of complete tracks: Signal vs Background 1 2 Number of complete tracks Background events have a small theta 2025/4/19 3
Efficiency of Complete Tracks with vertices range Inefficiency in complete tracks for large range vertices, Need to investigate tracks from standalone detectors proportion of track number =2 proportion of track number =0 2025/4/19 4
PFO Energy: Signal vs background PFO energy: signal vs background 2025/4/19 5
Cos : Signal vs background Cos 1& Cos 2: signal vs background 2025/4/19 6
: Signal vs background 1 & 2 : signal vs background 2025/4/19 7
me1e2: Signal vs background me1e2: signal vs background 2025/4/19 8
2-muon channel full simulation analysis Signal: ee -> HZ, Z-> , H->X1,X2, X1-> , X2 -> Signal events: 80,000, MX1,2: 10 GeV Background: ee -> Background events: 20,000 2025/4/19 9
Number of complete tracks: Signal vs Background Number of complete tracks 2025/4/19 10
Efficiency of Complete Tracks with vertices range proportion of track number =2 proportion of track number =0 2025/4/19 11
: Signal vs background 1& 2: signal vs background 2025/4/19 12
: Signal vs background 1 & 2 : signal vs background 2025/4/19 13
, : Signal vs background : signal vs background : signal vs background Backgrounds: two electrons back to back; 2025/4/19 14
m 1 2: Signal vs background m 1 2: signal vs background 2025/4/19 15
Summary The number of reconstructed tracks depends on vertex range Compared , , , , PFO energy, me1e2distributions between LLP signal and background Discriminating variables: , , PFO energy, me1e2 To do Apply Final PID with CEPCSW Re-vertexing in small vertex range to improve tracking efficiency Check more distributions: te1e2, Pte1, Pte2, t 1 2, Pt 1, Pt 2 4-lepton channel analysis 2025/4/19 16
Backup 2024-12-25 17
2-electron: Pt1 Pt2 Signal vs background Pt1: signal vs background Pt2: signal vs background 2025/4/19 18
2-muon: Pt1 Pt2Signal vs background Pt1: signal vs background Pt2: signal vs background 2025/4/19 19
2-muon PFO Energy: Signal vs background PFO energy: signal vs background 2025/4/19 20
4-electron channel full simulation analysis Signal: ee -> HZ, Z->nunu, H->X1,X2, X1->ee, X2 ->ee Signal events: 80,000, MX1,2: 10 GeV Background: ee -> HZ, Z->ee, H->inclusive Background events: 200,000 2025/4/19 21
Number of complete tracks: Signal vs Background Number of complete tracks 2025/4/19 22
SS1 vertex vs SS2 vertex : complete tracker number track number =1 track number =2 23
SS1 vertex vs SS2 vertex : complete tracker number track number =3 track number =4 2025/4/19 24
4-muon channel full simulation analysis Signal: ee -> HZ, Z->nunu, H->X1, X2, X1->mumu, X2 ->mumu Background: ee -> HZ, Z->mumu, H->inclusive Signal events: 80,000, MX1,2: 10 GeV Background events: 200,000 2025/4/19 25
Number of complete tracks: Signal vs Background Number of complete tracks 2025/4/19 26
SS1 vertex vs SS2 vertex : complete tracker number proportion of track number =1 proportion of track number =2 2025/4/19 27
SS1 vertex vs SS2 vertex : complete tracker number track number =4 track number =3 2025/4/19 28
