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Target Resolution Enhancement in 3-Track Vertex Position Distribution Analysis

This outline presents a method description and findings regarding target resolution through vertex position distribution analysis with a focus on multi-track vertices. The study compares target resolutions, different vertex positions, and concludes on the resolution sensitivity to various factors.

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Target Resolution Enhancement in 3-Track Vertex Position Distribution Analysis

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Presentation Transcript

  1. Target Resolution Check Y.C.Han@k0 Meeting Oct 17, 2007

  2. Outline • Method Description • Vertex Position Distribution • Target Resolution w/ Cut • Conclusion

  3. Method Description2-tr-vertex Information Opening Angle Vertex Position: p_v = (p1+p2)/2 track1 track2 dist_tr = | p1- p2 | …… Z ( up ) Y Position p1(x1,y1,z1) Position p2 (x2,y2,z2) 0 X (γ beam) (Center of 680) Schematic for 2-tr-vertex Coordinate

  4. Method Description3-tr-vertex p_vb p_va Track 1 r_cir B A Track 3 Track 2 r_in C circumcircle incircle p_vc Vertex Position p_v = (p_va+p_vb+p_vc)/3 Schematic for 3-tr-vertex

  5. Vertex Position Distribution

  6. Vertex Position Distribution

  7. Target Resolution-1

  8. Target Resolution-2

  9. Target Resolution-3

  10. Target Resolution-4

  11. Conclusion By applying the simple position cut, one can get: • Target resolution using Method of 3-track-vertex can achieve ~ 1.8 mm, comparable with 2-track-vertex result 1.4 mm; • Up beam edge of target has better resolution than down beam edge; • Resolution is sensitive to vertex-distance cut and vertex position along yoke (Y-axis) cut . Z ( up ) Y 0 X (γ beam) (Center of 680) Coordinate

  12. That is all.

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