Hadron Calorimetry With Extremely Fine Spatial Segmentation

Particle Flow Algorithms attempt to measure each particle in a hadronic jet individually, where the major task for the hadron calorimeters is to measure the neutral hadrons. The calorimeters that can fully exploit the power of Particle Flow Algorithms emphasize spatial granularity over single particle energy resolution. In this context, the CALICE collaboration developed the Digital Hadron Calorimeter (DHCAL). The active media of the DHCAL are the Resistive Plate Chambers which are read out with 1 x 1 cm
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pads with 1-bit (digital) resolution. The DHCAL went through a broad beam test program over several years to yield a unique dataset of electromagnetic and hadronic interactions with unprecedented spatial resolution. In addition to conventional calorimetry, the DHCAL offers detailed measurements of event shapes, rigorous tests of simulation models and various analytical tools to improve calorimetric performance. The simulation of the DHCAL response is also a particularly challenging task. Here we report on the results from the analysis of DHCAL data and recent advances on the simulations, and discuss the near future plans including further tests of the hadronic interaction models.