Beam background studies and impact on vertex detector design at the FCC-ee

Beam backgrounds in lepton colliders arise from the indirect interactions of beam particles, either through photon emissions or interactions with the collective charge of the particle bunch. The rate of these interactions is highly dependent on beam parameters such as bunch density and sequencing. Although the energy of the resulting background particles is typically low, they significantly increase the occupancy at the vertex detector, making it important to account for them in the readout system. In this study, we characterize the beam background at the Z pole and assess its impact on occupancy across different vertex detector layers. This occupancy is then used to derive constraints for the readout system, particularly focusing on the digitization process.