Speaker
Dominik Dannheim
(CERN)
Description
The CALICE collaboration has tested several large calorimeter systems in test
beams in recent years. These detectors, based on iron and tungsten absorbers
and different readout technologies, are all designed to meet the requirements of jet
reconstruction at a future linear collider using particle flow techniques, which
means that they were all read out with high spatial granularity in both the
transverse and longitudinal directions. Precise timing information is also
obtained in some cases. Data were taken with beams of muons, electrons, pions
and protons.
Simulation tools like GEANT4 are ubiquitous in particle physics. The
optimisation of the design for a future linear collider detector, and the
viability of the particle flow approach, will partly rely on such simulations.
The CALICE data provide a unique resource for testing the shower models
implemented in GEANT4 because of the details revealed about the internal
structure of hadronic showers. For example, software compensation techniques
can be used to robustly improve the energy resolution and linearity. Detailed
measurements of transverse and longitudinal shower shapes in both pion and
proton cascades are made and compared with simulations. In hadronic showers,
MIP-like hadron tracks can be distinguished from electromagnetic components in
hadronic showers and studies of shower leakage can be performed. Many recent
results will be summarised in this talk.
