Performances of two resistive MicroMegas prototypes for the Time Projection Chambers of the T2K Near Detector upgrade

T2K is a long baseline neutrino experiment that has been operating since 2009 providing some of the world-wide leading measurements for neutrino oscillation parameters. An upgrade for the Near Detector, ND280, of T2K has been proposed. It includes the installation of two new Time Projection Chambers (TPC) based on a new read-out technology: the resistive anode MicroMegas (RMM). This technology is expected to reduce the number of electronic channels while maintaining or improving the current ND280 TPCs' bulk MicroMegas perfomance. A series of tests have been performed and further studies are ongoing to validate this approach. Two RMM prototypes were studied in dedicated beamtests. All results so far, some of them still preliminary, indicate that a better performance can be achieved, even with larger pads, thanks to the advantages of RMM