The CALICE collaboration is currently developing engineering prototypes of electromagnetic and hadronic calorimeters for a future linear collider detector. This detector is designed to be used in particle-flow based event reconstruction. In particula
r, the calorimeters are optimized for the individual reconstruction and separation of electromagnetic and hadronic showers. They are conceived as sampling calorimeters with tungsten and steel absorbers, respectively. Two electromagnetic calorimeters are being developed, one with silicon-based active layers and one based on scintillator strips that are read out by MPPCs, allowing highly granular readout. The analog hadron calorimeter is based on scintillating tiles that are also read out individually by silicon photomultipliers. The multi-channel, auto-triggered front-end chips are integrated into the active layers of the calorimeters and are designed for minimal power consumption (power pulsing). The goal of the construction of these prototypes is to demonstrate the feasibility of building and operating detectors with fully integrated front-end electronics. The concept and engineering status of these prototypes are reported here.
Supersymmetric models provide many new complex phases which lead to CP violating effects in collider experiments. As an example, CP-sensitive triple product asymmetries in neutralino production and subsequent leptonic two-body decays are studied with
in the Minimal Supersymmetric Standard Model. A full ILD detector simulation has been performed at a center of mass energy of 500GeV, including the relevant Standard Model background processes, a realistic beam energy spectrum, beam backgrounds and a beam polarization of 80% and -60% for the electron and positron beams, respectively. Assuming an integrated luminosity of 500fb-1 collected by the experiment and the performance of the current ILD detector, a relative measurement accuracy of 10% for the CP-sensitive asymmetry can be achieved in the chosen scenario.
The CALICE collaboration is developing an engineering prototype of an analog hadron calorimeter for a future linear collider detector. The prototype has to prove the feasibility of building a realistic detector with fully integrated front-end electro
nics. The performance goals are driven by the requirement of high jet energy resolution and the measurement of the details of the shower development. The signals are sampled by small scintillating plastic tiles that are read out by silicon photomultipliers. The ASICs are integrated into the calorimeter layers and are optimized for minimal power consumption. For the photodetector calibration an LED system is integrated into each of the detector channels. In this report the status and performance of the realized module are presented. In particular, results from timing measurements are discussed, as well as tests of the calibration system. The new module has also been used in the DESY test beam environment and first results from the electron beam tests are reported.
A basic prototype for an analog hadron calorimeter for a future linear collider detector is currently being realized by the CALICE collaboration. The aim is to show the feasibility to build a realistic detector with fully integrated readout electroni
cs. An important aspect of the design is the improvement of the jet energy resolution by measuring details of the shower development with a highly granular device and combining them with the information from the tracking detectors. Therefore, the signals are sampled by small scintillating tiles that are read out by silicon photomultipliers. The ASICs are integrated into the calorimeter layers and are developed for minimal power dissipation. An embedded LED system per channel is used for calibration. The prototype has been tested extensively and the concept as well as results from the DESY test setups are reported here.
The CALICE collaboration is developing calorimeters for a future linear collider, and has collected a large amount of physics data during test beam efforts. For the analysis of these data, standard software available for linear collider detector stud
ies is applied. This software provides reconstruction of raw data, simulation, digitization and data management, which is based on grid tools. The data format for analysis is compatible with the general linear collider software. Moreover, existing frameworks such as Marlin are employed for the CALICE software needs. The structure and features of the software framework are reported here as well as results from the application of this software to test beam data.
