Cazzaniga, C;
Odagiu, P;
Depero, E;
Molina Bueno, L;
Andreev, YM;
Banerjee, D;
Bernhard, J;
... Ulloa, P; + view all
(2021)
Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel.
European Physical Journal C
, 81
(10)
, Article 959. 10.1140/epjc/s10052-021-09705-5.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjc/s10052-021-09705-5 |
| Publisher version: | https://doi.org/10.1140/epjc/s10052-021-09705-5 |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10139525 |
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