Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel
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Archivos
Fecha
2021-10
Profesor/a Guía
Facultad/escuela
Idioma
en
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Editor
Springer Science and Business Media Deutschland GmbH
Nombre de Curso
Licencia CC
Attribution 4.0 International
CC BY 4.0
Deed
Licencia CC
https://creativecommons.org/licenses/by/4.0/
Resumen
We report the results of a search for a new vector boson (A′) decaying into two dark matter particles χ1χ2 of different mass. The heavier χ2 particle subsequently decays to χ1 and an off-shell Dark Photon A′ ∗→ e+e-. For a sufficiently large mass splitting, this model can explain in terms of new physics the recently confirmed discrepancy observed in the muon anomalous magnetic moment at Fermilab. Remarkably, it also predicts the observed yield of thermal dark matter relic abundance. A detailed Monte-Carlo simulation was used to determine the signal yield and detection efficiency for this channel in the NA64 setup. The results were obtained re-analyzing the previous NA64 searches for an invisible decay A′→ χχ¯ and axion-like or pseudo-scalar particles a→ γγ. With this method, we exclude a significant portion of the parameter space justifying the muon g-2 anomaly and being compatible with the observed dark matter relic density for A′ masses from 2me up to 390 MeV and mixing parameter ε between 3 × 10 - 5 and 2 × 10 - 2. © 2021, The Author(s).
Notas
Indexación: Scopus.
Palabras clave
Dark Matter, Muon, Standard Model
Citación
European Physical Journal C, Volume 81, Issue 10, October 2021, Article number 959
DOI
10.1140/epjc/s10052-021-09705-5