A multi-TeV muon collider has been proposed as a powerful tool to explore the Standard Model with unprecedented precision, as a possible successor of the High-Luminosity LHC. The Muon Collider aims for precise Higgs boson coupling measurements and searches for new physics at the TeV scale, requiring accurate event reconstruction and particle identification. The Particle Flow Algorithm (PFA), which integrates data from various subsystems, is well-suited for this task. However, one major challenge for the Muon Collider is mitigating the muon beam-induced background (BIB), which affects the detector performance. Therefore, the implementation of a PFA at the Muon Collider calls for the use of precise, robust and radiation-hard detector technologies allowing for precise signal reconstruction and background rejection.

This contribution presents the studies for the development of a hadronic calorimeter for the Muon Collider using resistive Micro Pattern Gas Detectors (MPGD). This MPGD-based calorimeter is ideal for PFA thanks to the high-granular readout capabilities (O(cm2)) and particularly suitable for the Muon Collider background conditions, thanks to its radiation-hard technology and high rate capabilities (up to 10 MHz/cm2). Furthermore, resistive MPGDs, such as resistive Micromegas and µ-RWELL, offer excellent spatial resolution, operational stability (discharge quenching), and uniformity, making them well-suited for calorimetry.

The results of the characterization studies performed with muon beam at CERN SPS on three MPGD technologies, resistive MicroMegas, µ-RWELL, and RPWELL, are presented. Additionally, preliminary results for an HCAL cell prototype consisting of eight layers (~1 λ) of alternating stainless steel and MPGD detectors tested with pion beams of energy ranging up to 10 GeV are shown.

gaseous calorimeter,resistive MPGD