Paper

Combined search for light dark matter with electron and muon beams at NA64

Krasnikov, N V, Kirsanov, M M, Gninenko, S N, Kirpichnikov, D V

2019

Overview

We discuss prospects of searching for a dark photon (\\(A'\\)) which serves as mediator between Standard model (SM) particles and light dark matter (LDM) by using the combined results from the NA64 experiment at the CERN SPS running in high-energy electron (NA64e) and muon (NA64\\(\\)) modes. We discuss the most natural values and upper bounds on the \\(A'\\) coupling constant to LDM and show they are lying in the range accessible at NA64. While for the projected \\( 510^12\\) electrons on target (EOT) NA64e is able to probe the scalar and Majorana LDM scenarios, the combined NA64e and NA64\\(\\) results with \\( 10^13\\) EOT and a few \\(10^13\\) MOT, respectively, will allow covering significant region in the parameter space of the most interesting LDM models. This makes NA64e and NA64\\(\\) extremely complementary to each other and increases significantly the discovery potential of sub-GeV DM.

• Publisher: Cornell University Library, arXiv.org
• Subject: Dark matter / Electron beams / High energy electrons / Muons / Particle beams / Photon beams / Synchrotrons / Upper bounds