Silicon Photomultipliers for High Energy Physics Detectors

In this paper I want to review the current status of development of multi-pixel silicon-based avalanche photo-diodes operated in Geiger mode, also known as Silicon Photomultipliers (SiPM). Particular emphasis is given to the application of this type of photo-sensors in high energy physics detectors

ILCDIRAC, a DIRAC extension for the Linear Collider community

ILCDIRAC is a complete distributed computing solution for the Linear Collider community. It's an extension of the Dirac system and now used by all detector concepts of the LC community. ILCDIRAC provides a unified interface to the distributed resources for the ILC Virtual Organization and provides common interfaces to all ILC applications via a simplified API. It supports the overlay of beam-induced backgrounds with minimal impact on the Storage Elements by properly scheduling the jobs attempting to access the files. ILCDIRAC has been successfully used for the CLIC Conceptual Design Report and the ILC SiD Detailed Baseline Design, and is now adopted by the LC community as the official grid production tool. Members of the CALICE collaboration also use ILCDIRAC within their own Virtual Organization

Tests of a particle flow algorithm with CALICE test beam data

The studies presented in this paper provide a first experimental test of the Particle Flow Algorithm (PFA) concept using data recorded in high granularity calorimeters. Pairs of overlaid pion showers from CALICE 2007 test beam data are reconstructed by the PandoraPFA program developed to implement PFA for a future lepton collider. Recovery of a neutral hadron's energy in the vicinity of a charged hadron is studied. The impact of the two overlapping hadron showers on energy resolution is investigated. The dependence of the confusion error on the distance between a 10 GeV neutral hadron and a charged pion is derived for pion energies of 10 and 30 GeV which are representative of a 100 GeV jet. The comparison of these test beam data results with Monte Carlo simulation is done for various hadron shower models within the GEANT4 framework. The results for simulated particles and for beam data are in good agreement thereby providing support for previous simulation studies of the power of Particle Flow Calorimetry at a future lepton collider