Track parameter resolution study of a pixel only detector for LHC geometry and future high rate experiments

Recent progress in pixel detector technology in general and in the HV-MAPS technology in particular make it feasible to construct an all-silicon pixel detector for large scale particle experiments like ATLAS or CMS. Previous studies have indicated that six to nine layers of pixel sensors, in comparison to the 14 detector layers planned for Inner Tracker ATLAS upgrade, are sufficient to reliably reconstruct particle trajectories. The performance of an all-pixel detector and the minimum number of required pixel layers is studied based on a full GEANT simulation for high luminosity conditions at the upgraded LHC. Furthermore, the ability of an all-pixel detector to form trigger decisions using a special triplet pixel layer design is studied. Such a design could be used to reconstruct all tracks originating from the proton-proton interaction at the first hardware level at 40 MHz collision frequency.