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Title: Semivisible dark photon phenomenology at the GeV scale

Journal Article · · Physical Review. D.

In rich dark sector models, dark photons heavier than tens of MeV can behave as semi-visible particles: their decays contain both visible and invisible final states. We present models containing multiple dark fermions which allow for such decays and inscribe them in the context of inelastic dark matter and heavy neutral leptons scenarios. Our models represent a generalization of the traditional inelastic dark matter model by means of a charge conjugation symmetry. We revisit constraints on dark photons from $e^+e^-$ colliders and fixed target experiments, including the effect of analysis vetoes on semi-visible decays, A' → $$\psi_i$$($$\psi_j$$ →$$\psi_kℓ^+ℓ^-)$$. We find that in some cases, the BaBar and NA64 experiments no longer exclude large kinetic mixing, ϵ ~ 10-2, and, specifically, the related explanation of the discrepancy in the muon (g - 2). This reopens an interesting window in parameter space for dark photons with exciting discovery prospects. We point out that a modified missing-energy search at NA64 can target short-lived A' decays and directly probe the newly-open parameter space.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); European Union’s Horizon 2020; Marie Sklodowska-Curie
Grant/Contract Number:
AC02-07CH11359; 101086085; H2020-MSCA-ITN-2019/860881
OSTI ID:
1992387
Alternate ID(s):
OSTI ID: 1958451
Report Number(s):
CERN-TH-2023-019; FERMILAB-PUB-23-054-T; IRMP-CP3-23-08; arXiv:2302.05410; PRVDAQ; 015032
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Vol. 108 Journal Issue: 1; ISSN 2470-0010
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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