Search for dark matter in association with a hardronic top and bottom quark and characterization of the CMS HGCAL silicon sensor



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A search for dark matter using events containing a hadronically decaying top quark, one b jet arising from initial-state gluon-splitting, no leptons, and a large imbalance in transverse momentum is presented. The data being used were collected from proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the LHC and corresponding to an integrated luminosity of 137 /fb. The results are interpreted based on a simplified dark matter model that provides explanation for observed proximity of the dark matter and baryon abundances. As part of the High Luminosity LHC (HL-LHC) project, the high-granularity calorimeter (HGCAL) will be a major upgrade of the CMS experiment to replace the current endcap calorimeter. Due to the higher instantaneous luminosity of the HL-LHC and the rapidity range the HGCAL will cover, radiation tolerance is a primary design consideration. The silicon sensor has been chosen due to its intrinsic radiation hardness. Results from an irradiation campaign of 8-inch silicon sensors are presented.

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Particle Physics, Dark Matter, Silicon Detector