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Constraining light thermal inelastic dark matter with NA64

Mongillo, Martina; Abdullahi, Asli; Banto Oberhauser, Benjamin; Crivelli, Paolo; Hostert, Matheus; Massaro, Daniele; Molina Bueno, Laura; Pascoli, Silvia

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Martina Mongillo

Benjamin Banto Oberhauser

Paolo Crivelli

Matheus Hostert

Daniele Massaro

Laura Molina Bueno


A vector portal between the Standard Model and
the dark sector is a predictive and compelling framework
for thermal dark matter. Through co-annihilations, models
of inelastic dark matter (iDM) and inelastic Dirac dark matter (i2DM) can reproduce the observed relic density in the
MeV to GeV mass range without violating cosmological limits. In these scenarios, the vector mediator behaves like a
semi-visible particle, evading traditional bounds on visible
or invisible resonances, and uncovering new parameter space
to explain the muon (g − 2) anomaly. By means of a more
inclusive signal definition at the NA64 experiment, we place
new constraints on iDM and i2DM using a missing energy
technique. With a recast-based analysis, we contextualize
the NA64 exclusion limits in parameter space and estimate
the reach of the newly collected and expected future NA64
data. Our results motivate the development of an optimized
search program for semi-visible particles, in which fixed target experiments like NA64 provide a powerful probe in
the sub-GeV mass range.


Mongillo, M., Abdullahi, A., Banto Oberhauser, B., Crivelli, P., Hostert, M., Massaro, D., …Pascoli, S. (2023). Constraining light thermal inelastic dark matter with NA64. The European Physical Journal C, 83(5), Article 391.

Journal Article Type Article
Acceptance Date Apr 18, 2023
Online Publication Date May 10, 2023
Publication Date May 10, 2023
Deposit Date Feb 12, 2024
Publicly Available Date Feb 12, 2024
Journal The European Physical Journal C
Print ISSN 1434-6044
Publisher SpringerOpen
Peer Reviewed Peer Reviewed
Volume 83
Issue 5
Article Number 391
Keywords Physics and Astronomy (miscellaneous); Engineering (miscellaneous)
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