5 papers
Improved limits on a new in scenarios with the NA64 experiment at CERN
The NA64 Collaboration, Yu. M. Andreev, A. Antonov +53
Extensions of the Standard Model featuring an additional gauge symmetry provide a compelling framework linking the origin of neutrino masses to possible dark matter ca…
Feasibility of Low-Energy True Muonium Photoproduction
Ivo Schulthess, Benjamin Banto Oberhauser, Paolo Crivelli
True muonium, the bound state of a muon and an antimuon, is a theoretically well-understood but experimentally unobserved exotic atom. Its purely leptonic nature makes it a sensiti…
Precision continuous-wave laser measurement of the interval in positronium
Lucas de Sousa Borges, Edward Thorpe-Woods, Evans Javary +1
We report a 4.9\,ppb measurement of the positronium interval using continuous-wave two-photon laser spec…
Axion Searches at the CERN SPS: From Their Dawn to Current Prospects
Paolo Crivelli, Martina Mongillo
This mini-review traces the evolution of axion searches at the CERN Super Proton Synchrotron (SPS), beginning with the early proposal by Guido Barbiellini in 1982 and culminating i…
Two-Photon Optical Ramsey-Doppler Spectroscopy of Positronium and Muonium
Evans Javary, Edward Thorpe-Woods, Irene Cortinovis +3
Positronium and muonium, as purely leptonic atoms without internal structure, provide ideal systems for high-precision tests of quantum electrodynamics (QED) and measurements of fu…