Search for dark sector by repurposing the UVX Brazilian synchrotron

• Published in: The European physical journal. C, Particles and fields Vol. 83; no. 6; pp. 514 - 6
• Main Authors: Duarte, L., Lin, L., Lindner, M., Kozhuharov, V., Kuleshov, S. V., de Jesus, A. S., Queiroz, F. S., Villamizar, Y., Westfahl, H.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2023; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Astronomy; Astrophysics and Cosmology; Atoms & subatomic particles; Dark matter; Elementary Particles; Energy; Experiments; Hadrons; Heavy Ions; Laboratories; Light; Measurement Science and Instrumentation; Missing mass (astrophysics); Nuclear Energy; Nuclear Physics; Particle physics; Photons; Physics; Physics and Astronomy; Positron beams; Positrons; Quantum Field Theories; Quantum Field Theory; Regular Article - Theoretical Physics; Searching; Sensors; String Theory; Synchrotrons
• ISSN: 1434-6052; 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-023-11603-x

We propose the first Se arch for D ark S ector at the Brazilian Synchrotron Light Laboratory, site of Sirius, a fourth-generation storage ring. We show that UVX, Sirius predecessor, can be a promising dark sector detector, SeDS , with unprecedented sensitivity. The search is based on a 1 - 3  GeV positron beam impinging on a thick target leading the e + e - → γ A ′ reaction, followed by a missing mass spectrum event reconstruction. We show that SeDS has the potential to probe dark photons with masses up to 55 MeV and kinetic coupling down to ϵ 2 ∼ 10 - 12 . Therefore, such experiment would constitute the best dark photon probe worldwide in the 10 - 55  MeV mass range, being able to probe an unexplored region of parameter space.