IR challenges and the machine detector interface at FCC-ee Manuela Boscolo, Helmut Burkhardt, Katsunobu Oide and Michael K. Sullivan Eur. Phys. J. Plus, 136 10 (2021) 1068 Published online: 25 October 2021 DOI: 10.1140/epjp/s13360-021-02031-5