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- Title
New channel to search for dark matter at Belle II.
- Authors
Liang, Jinhan; Liu, Zuowei; Yang, Lan
- Abstract
We propose a new "disappearing positron track" channel at Belle II to search for dark matter, in which a positron that is produced at the primary interaction vertex scatters with the electromagnetic calorimeter to produce dark matter particles. Such scatterings can occur via either annihilation with atomic electrons, or the bremsstrahlung process with target nuclei. The main backgrounds are due to photons and neutrons that are produced in the same scatterings and then escape detection. We require a large missing energy and further veto certain activities in the KLM detector to suppress such backgrounds. To illustrate the sensitivity of the new channel, we consider a new physics model where dark matter interacts with the standard model via a dark photon, which decays predominantly to dark matter; we find that our proposed channel can probe some currently unexplored parameter space, surpassing both the mono-photon channel at Belle II and the NA64 constraints.
- Subjects
KLM Royal Dutch Airlines (Company); DARK matter; BREMSSTRAHLUNG; STANDARD model (Nuclear physics); ELECTRON scattering; ELECTROMAGNETIC wave scattering; WEAKLY interacting massive particles; POSITRONS
- Publication
Journal of High Energy Physics, 2024, Vol 2024, Issue 5, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP05(2024)273