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

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.

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Publication Details

Published
2025-12-04
DOI
https://doi.org/10.22323/1.485.0139
Primary Topic
Dark Matter and Cosmic Phenomena
Type
article
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Lohengrin — a proposed experiment in the search for dark bremsstrahlung and a portal to the dark sector

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

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article en

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.

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