Andreev, YM;
Banerjee, D;
Bernhard, J;
Bondì, M;
Burtsev, VE;
Celentano, A;
Charitonidis, N;
... Volkov, VY; + view all
(2021)
Improved exclusion limit for light dark matter from e+e- annihilation in NA64.
Physical Review D
, 104
(9)
, Article L091701. 10.1103/PhysRevD.104.L091701.
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Abstract
The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson A′ were set by the NA64 experiment for the mass region mA′≲250 MeV, by analyzing data from the interaction of 2.84×1011 100-GeV electrons with an active thick target and searching for missing-energy events. In this work, by including A′ production via secondary positron annihilation with atomic electrons, we extend these limits in the 200-300 MeV region by almost an order of magnitude, touching for the first time the dark matter relic density constrained parameter combinations. Our new results demonstrate the power of the resonant annihilation process in missing energy dark-matter searches, paving the road to future dedicated e+ beam efforts.
| Type: | Article |
|---|---|
| Title: | Improved exclusion limit for light dark matter from e+e- annihilation in NA64 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.104.L091701 |
| Publisher version: | https://doi.org/10.1103/PhysRevD.104.L091701 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| 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/10140433 |
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