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International Large Detector (ILD) adopts Particle Flow Algorithm (PFA) forprecise measurement of multiple jets. The electromagnetic calorimeter (ECAL) ofILD has two candidates sensor technologies for PFA, which are pixelized siliconsensors and scintillator-strips with silicon photomultipliers. Pixelizedsilicon sensors have higher granularity for PFA, however they have an issue ofcost reduction. In contrast, scintillator-strips have an advantage ofrelatively low cost and a disadvantage of degradation of position resolution byghost hits, which are generated by orthogonal arrangement. Hybrid ECAL usingboth candidates is proposed to supplement these disadvantages. In this paper,we report an optimization study of the hybrid ECAL using detector simulation.

Optimization of layer composition for ILD ECAL