Abstract
In order to measure the jet products of the hadronic decays of electroweak bosons in a future lepton collider with 3-4% resolution, a novel approach named Particle Flow Algorithms is proposed. The Particle Flow Algorithms attempt to measure each particle in a hadronic jet individually, using the detector providing the best energy/momentum resolution. The role of the hadronic calorimeters is to measure the neutral component of the hadronic jets. In this context, the CALICE Collaboration developed the Digital Hadron Calorimeter, which uses Resistive Plate Chambers as active media. The 1-bit resolution (digital) readout of 1 × 1 cm2 pads achieves a world record in the number of readout channels already at the prototyping stage. Here we report on the results from the analysis of pion events of momenta between 2 to 60 GeV/c collected in the Fermilab test beam with an emphasis on the intricate calibration procedures.
Highlights
The CALICE Collaboration develops calorimeters that are optimized for the application of Particle Flow Algorithms (PFAs) for future linear colliders [1]
The calorimeter consisted of a 38-layer structure with 1.75 cm thick steel absorber plates and a 14-layer structure with eight 2 cm thick steel plates followed by six 10 cm thick steel plates
The Digital Hadron Calorimeter (DHCAL) provides another unique feature in calorimetry: For operation in a colliding beam environment, the DHCAL does not need a dedicated calibration system, as track segments can be used to monitor the performance of the Resistive Plate Chambers (RPCs)
Summary
The CALICE Collaboration develops calorimeters that are optimized for the application of Particle Flow Algorithms (PFAs) for future linear colliders [1]. The large CALICE Digital Hadron Calorimeter (DHCAL) prototype was built in 2009-2010. During the Fermilab beam tests, up to 52 layers were installed. The calorimeter consisted of a 38-layer structure (main stack) with 1.75 cm thick steel absorber plates and a 14-layer structure (tail catcher) with eight 2 cm thick steel plates followed by six 10 cm thick steel plates. In addition to the absorber plates, each layer of RPCs was contained in a cassette with a 2 mm thick Copper front plate and a 2 mm thick Steel back plate. Calibration of the W-DHCAL with the CERN test beam data is presented in [10], software compensation techniques for the Fe- and W-DHCAL are introduced in [11] and the recent DHCAL developments are described in [12]
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