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CU calorimeter study

This presentation by the CU group focuses on the development of a new tile sampling calorimeter design for future linear colliders. Key topics include energy flow analysis, the effects of position resolution on jet direction and mass reconstruction, and the importance of track-cluster matching. The study finds that the CU-designed calorimeter demonstrates superior position resolution performance, achieving a remarkable 0.7mm at high energy. A discussion on current activities to improve systematic uncertainties and cosmic ray tests completes the presentation, highlighting advancements in calorimetric measures.

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CU calorimeter study

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  1. CU calorimeter study Toshinori Abe Uriel Nauenberg Joseph Proulx University of Colorado Jan. 9, 2003

  2. Introduction • CU group is interested in developing tile sampling calorimeter for a future linear collider. • We propose a new design of the tile calorimeter for energy flow. • In this talk, I will pick up some results from our recent studies of the calorimeter.

  3. Topics of Discussion • Brief description of Energy flow analysis • Effects of position resolution • Design of a tile calorimeter • Position resolution • Summary

  4. Energy flow analysis • Typical idea of energy flow. charged particles  tracker neutral particles  calorimeter • What information can calorimeters provide? Energy important! (jet energy, etc) positionimportant! (jet direction, etc) (direction and longitudinal shower shape) for sampling calorimeter

  5. Energy flow (cont.) • Experience by ALEPH says photon reconstruction is important because: Typical multi-jet event charged particles carry 64% E tracker photons carry 25% EEM cal. neutral hadrons carry 11% EHAD cal. • Excellent position resolution helps to distinguish between charged and neutral clusters.

  6. Effects from position resolution • The position resolution resolution affects the following two parts: (1) Jet direction (p0 separation) (2) Separation between neutral and charged clusters. • In the following slides, I will show how these affects mass reconstruction by reconstructing W mass.

  7. W mass reconstruction (ideal) • I reconstruct W mass using eett events at 500GeV using Fast MC.

  8. W mass reconstruction (cont.) • To check p0 separation effect, I merge neutral clusters concerning the position resolution.

  9. Track cluster matching • Track-cluster association has been done by extrapolating the track to the cluster. The performace is determined by the cluster position resolution.

  10. W mass reconstruction • Track-cluster matching affects mass reconstruction more than jet direction. Ideal case=4.0GeV

  11. Position resolution importance • You see more effect from track-cluster matching than p0 separation. • Hence, current our activities are focused on improving the position resolution more than p0 separation.

  12. Design of calorimeter • W + scintillator • There are half size offsets layer by layer to improve position resolution. • The tile size is about 4×4cm2 at the inner radius (~200cm).

  13. Energy linearity

  14. Energy resolution

  15. Position resolution • Sampling calorimeter gives two measurements. • Simple energy weight + line fitting

  16. sf vs. sj • f gives better resolution than j. So we will use f. (But j is important to GMSB)

  17. Shower starting or max.? • Which defined position gives better resolution, shower starting point or max. point? • It looks shower starting point gives better resolution for hadron particles…

  18. Position resolution • For EM showers, the position at shower max. gives better position resolution.

  19. Benefit of CU geometry • CU design gives better resolution than normal design.

  20. More improvement • We could get more precise position resolution as follows: • Correct the systematic from energy weight method. • Assume particles come from IP (i.e. IP constraint) • These works are done by Joseph Proulx.

  21. Systematic from energy weight

  22. After the correction • No offset geometry shows strong position dependence in the resolution. CU geometry also helps to reduce the systematic further.

  23. Current best achievement 0.7mm resolution!

  24. Summary • We have studied CU designed calorimeter. • CU calorimeter shows better position resolution performance than ordinal tower calorimeter and 0.7mm at high energy is current best achieved value. • More studies • cosmic ray test • KS0p0p0reconstruction • clustering, p0 separation?…

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