Abstract
A detailed study of hadronic interactions is presented using data recorded with the highly granular CALICE silicon–tungsten electromagnetic calorimeter. Approximately 350,000 selected π− events at energies between 2 and 10GeV have been studied. The predictions of several physics models available within the GEANT4 simulation tool kit are compared to this data. A reasonable overall description of the data is observed; the Monte Carlo predictions are within 20% of the data, and for many observables much closer. The largest quantitative discrepancies are found in the longitudinal and transverse distributions of reconstructed energy.
Highlights
The primary physics goals at a future high energy lepton collider require the precise measurement of the energy of hadronic jets [1]
There are the Low Energy Parametrized (LEP) and High Energy Parametrized (HEP) models, which are based on fits to experimental data
These models are combined into physics lists within which they are applied in a specified energy range
Summary
The primary physics goals at a future high energy lepton collider require the precise measurement of the energy of hadronic jets [1]. The PFA approach aims to reconstruct individually all particles in the final state of the e+e− collision This requires highly segmented calorimeters to disentangle the contributions from showers created by different types of particles within a jet, i.e. from charged and neutral particles. The response of a highly granular silicon-tungsten electromagnetic calorimeter prototype (Si-W ECAL) [5] is used to test hadronic shower models at low energies. The majority of charged pions and other hadrons within high energy jets have energies in this range and it is of considerable interest to validate the performance of Monte Carlo simulations. The high granularity of the Si-W ECAL permits a detailed measurement of hadronic interactions in terms of global observables describing both the longitudinal and transverse shower development. A summary, conclusions, and prospects for future studies are given in the last section
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