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Lohengrin — a proposed experiment in the search for dark bremsstrahlung and a portal to the dark sector

Year: 2025
Type: conference-paper
Abstract: We present a proposal for a future light dark matter search experiment at the Electron Stretcher Accelerator ELSA in Bonn: Lohengrin. It employs the fixed-target missing momentum based technique for searching for dark-sector particles. The Lohengrin experiment uses a beam of electrons that is extracted from the ELSA accelerator and shot onto a thin target to produce mainly Standard Model bremsstrahlung and possibly new particles coupling feebly to the electron. A well motivated candidate for such a new particle is the dark photon. The dark photon is a new, possibly massive gauge boson arising from a new gauge interaction in a dark sector and mixing kinetically with the Standard Model photon. The Lohengrin experiment is estimated to reach sensitivity to couplings small enough to explain the relic abundance of dark matter in various models for dark photon masses between ∼1 MeV and ∼100 MeV.
DOI: 10.22323/1.485.0139
Authors: Matthias Hamer, Bechtle Philip, Christian Bespin, Dominique Breton, Cedric Breuning, Carlos Orero Canet, Klaus DESCH, Herbi Dreiner, Oliver Freyermuth, Rhorry Gauld, Markus Gruber, César Blanch Gutiérrez, Hazem Hajjar, Jan-Eric Heinrichs, Adrian Irles, Jochen Kaminski, Laney Klipphahn, Hans Krüger, Michael Lupberger, Jihane Maalmi, Romand Pöschl, Dennis Proft, Leonie Richarz, Tobias Schiffer, Patrick Schwäbig, Martin Schürmann, Dirk Zerwas
Institutions: University of Bonn, Centre National de la Recherche Scientifique, Institut National de Physique Nucléaire et de Physique des Particules, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, Norwegian University of Science and Technology, Universitat de València, Deutsches Elektronen-Synchrotron DESY, Instituto de Física Corpuscular, CNRS Helmholtz Dark Matter Lab
Language: English
Open Access status: hybrid
OpenAlex ID: W4416991593
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