Resistive MPGD-based HCal for future colliders.

Calorimeters at future colliders will require excellent energy resolution to differentiate between hadronic decays of W and Z bosons, a granularity at the (O(cm2)) level and time resolution of a few ns, to be compliant with the Particle Flow Algorithm for jet reconstruction. We propose a hadronic calorimeter (HCAL) consisting of a sampling of absorber material and resistive Micro Pattern Gaseous Detectors (MPGD) as the active layer for the future muon collider. We simulated a small-size (~1λ) MPGD-based HCAL prototype and studied its performance with pion beams. Furthermore, we performed the experimental characterization studies of MPGD prototypes with an active area of 20×20 cm2 in order to assess their performance under MIP irradiation, in terms of efficiency, time resolution, and response uniformity. We built a calorimeter prototype instrumented with 20×20 cm2 MPGDs and characterized its response under pion beams. New MPGD prototypes with a larger area (50×50 cm2) are currently under construction with the goal to assess the response uniformity, which is crucial for the hadronic shower reconstruction. In this paper, we report the simulation studies of a ~1.5λ calorimeter prototype including the new 50×50 cm2 detectors.