Beam dump experiment at future electron-positron colliders

We propose a new beam dump experiment at future colliders with electron (e(-)) and positron (e(+)) beams, BDee, which will provide a new possibility to search for hidden particles, like hidden photon. If a particle detector is installed behind the beam dump, it can detect the signal of in-flight decay of the hidden particles produced by the scatterings of e(+/-) beams off materials for dumping. We show that, compared to past experiments, BDee(in particular BDeeat e(+)e(-) linear collider) significantly enlarges the parameter region where the signal of the hidden particle can be discovered. (C) 2015 The Authors. Published by Elsevier B.V.