A toy model for understanding the space-point resolution of silicon pixel detectors with digital readout
Silicon pixel detectors are widely used in high-energy physics experiments as tracking detectors close to the primary interaction vertex. They provide excellent space-point resolution together with fast electronic readout. Many of them employ only digital (binary) readout which makes the applicability of centre-of-gravity algorithms less obvious. Charge sharing between neighboring pixels improves the resolution beyond the single-pixel limit, but in practice there is a lack of quantitative understanding of the achievable gains. This work provides a simplified analytical and numerical model with which the maximum improvement achievable through charge sharing is quantified for both one and two-dimensional pixel geometries. A phenomenological parameterisation of the resolution as a function of the average cluster size is derived and compared to experimental data from several detector technologies.