The LHCb ultra-fast simulation option, Lamarr design and validation Lucio Anderlini, Matteo Barbetti, Simone Capelli, Gloria Corti, Adam Davis, Denis Derkach, Nikita Kazeev, Artem Maevskiy, Maurizio Martinelli, Sergei Mokonenko et al. (2 more) EPJ Web of Conf., 295 (2024) 03040 Published online: 06 May 2024 DOI: 10.1051/epjconf/202429503040