Up-type FCNC in presence of Dark Matter

2025/04/28 by Bhattacharya, Subhaditya, Kolay, Lipika, Pradhan, Dipankar +1 · 3 citations
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2504.20045

Abstract

Dark Matter (DM) is a known unknown. Apart, current experimental constraints on flavor-changing neutral current (FCNC) processes involving up-type quarks also provide scope to explore physics beyond the Standard Model (SM). In this article, we establish a connection between the flavor sector and the DM sector with minimal extension of the SM. Here a singlet complex scalar field, stable under ℤ₃ symmetry, acts as DM and couples to SM up-type quarks through a heavy Dirac vector-like quark (VLQ), which shares the same ℤ₃ charge as of the DM. The model thus addresses the observed D⁰-D⁰ mixing, top-FCNC interactions, and D⁰ meson decays, together with DM relic density, while evading the direct and indirect DM search bounds. The model can be probed at the future high-energy muon collider, through distinctive signatures of VLQ production, where the VLQ decays into DM and SM particles, abiding by the existing bounds.

Cited by

• Complex scalar dark matter with effective Higgs portals beyond radiation domination
• Monojet and direct detection constraints on real scalar dark matter: EFT and a simple UV completion
• Lepton flavor violating top quark FCNC at the μTRISTAN

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