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R&D FOR HIGHLY GRANULAR CALORIMETERS. Roman Pöschl on behalf of the CALICE Collaboration. Motivation – Precision physics at future lepton colliders. W, Z separation in the ILD concept.

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R&D FOR HIGHLY GRANULAR CALORIMETERS

Roman Pöschlon behalf of the CALICE Collaboration

Motivation – Precisionphysicsat future lepton colliders

W, Z separation in the ILD concept

Unravelling the origin of electroweaksymmetrybreaking

- Need excellent jet energy resolution to separate

e.g. W and Z boson in their hadronic decays

- 3%/Ejet-4%/Ejetwhich is two times better than at LEP or SLC

- Physics goals at future lepton collider requires highly

granular calorimeters

Large R&D program of CALICE Collaboration

Different technologies under one roof

  • Construction of prototypes
  • Technological challenges
  • SiPM, power pulsedelectronics
  • - (Combined) beam tests with prototypes
  • since 2004 at CERN, DESY and Fermilab

Hadron calorimeters

Steel or tungsten as absorber

Scintillator as active medium or

Glass RPCs a active medium

RPCsallow for realisation of detection

volume with ~480000 calorimetriccells in 1m3

World record!!!!

Electromagneticcalorimeters

Tungsten as absorber

Silicon or scintillator as active medium

0.18x.0.18x0.2 m3 of detection volume

equippedwithup to 10000 cells

Analysis of beam test data and simulation studies

Hadron showers in greatdetail

Different stages of a hadron shower

Countingtrack segments

Secondaries

Primaryparticle

2nd Interaction

1st Interaction

4D reconstruction – Time structure of hadron showers

Particleseparation