Searches for BSM physics at a gamma-gamma collider with Energy < $12$ GeV based on European XFEL

Marten Berger, Gudrid Moortgat-Pick, Monika Wüst

The possibility of a Photon-Photon collider extension to the Beam dump of the $17.5$ GeV European XFEL has been discussed before as the first high energy collider of its sort. It w…