Speaker
Emilio Depero
(Eidgenössische Technische Hochschule Zürich)
Description
The NA64 experiment is a new experiment searching for invisible decays of dark photons using the electron beam of the CERN SPS dumped in an active target.To obtain the aimed sensitivity of NA64 to a single A'-decay for >$10^{10}$ eots, one of the key elements that is the use of an incoming electrons tagging with efficiency better than 95% and suppression of hadrons contamination in the e$^-$ beam down to the level < $10^{-5}$.The results obtained with a prototype version of the e$^-$ tagging system based on the detection of synchrotron radiation by BGO detector are presented.
Authors
Emilio Depero
(Eidgenössische Technische Hochschule Zürich)
Paolo Crivelli
(Eidgenoessische Technische Hochschule Zuerich (CH))
