1. Institut de Ciències del Cosmos Universitat de Barcelona Barcelona 08028 Spain
2. Department of Information and Communications Technologies Technical University of Cartagena Cartagena 30203 Spain
3. CERN ‐ European Organization for Nuclear Research Geneva Switzerland
4. Max‐Planck‐Institut für Physik Föhringer Ring 6 80805 München Germany
5. Imperial College London, Blackett Laboratory Prince Consort Road London SW7 2BW UK
6. Center for Astroparticles and High Energy Physics (CAPA), Universidad de Zaragoza Zaragoza 50009 Spain
7. Instituto Tecnológico de Aragón Zaragoza 50018 Spain
8. Yebes Observatory (IGN) Guadalajara 19141 Spain
9. Instituto de Física Corpuscular (IFIC) CSIC‐University of Valencia Valencia 46980 Spain
10. Institute for Optics and Quantum Electronics Friedrich Schiller University Jena 07743 Jena Germany
11. Technische Universität München Arcisstraße 21 80333 München Germany
12. TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada
13. Institució Catalana de Recerca i Estudis Avançats Barcelona 08010 Spain
14. Johannes Gutenberg Universität Mainz Staudingerweg 7 55128 Mainz Germany
15. Technical University of Darmstadt Institute for Energy Systems and Technology 64287 Darmstadt Germany
16. RIKEN Fundamental Symmetries Laboratory Wako 351‐0198 Japan
17. Heinrich Heine University Düsseldorf, Univeristätsstrasse 1 40225 Düsseldorf Germany