2020/12/31 by M. Fabbrichesi, Marco Fabbrichesi, Emidio Gabrielli
Physics and Astronomy · #Astrophysics #Axion #Boson #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Electron #Hidden sector #Light dark matter #Massive particle #Massless particle #Muon #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Positron #Quantum mechanics #Scalar field dark matter #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.104.015039
published as Phys. Rev. D 104, 015039 (2021) · 7 pages, 4 figures. Same as published version, new results included, a few typos corrected
openalex publication_date 2021/07/30 · arxiv created 2021/09/22 · arxiv updated 2021/09/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The \ensuremathμ+\ensuremath→e+X decay, where X is a dark sector boson, provides one of the strongest available bounds on the scale of dark sector interactions. The X boson can be an axion or a dark photon. We show that the concurrent determination of the antimuon and positron polarizations makes it possible to distinguish with a confidence level of 99% between the two dark sector portals with as few as 6 observed events in the case of the massless dark photon. Instead, the massive spin-1, dimension 4 dark portal cannot be distinguished from the axionlike case. We also discuss the possibility that the X boson be a massive spin-2 particle.