<p>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 <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <msub> <mi mathvariant="script">Z</mi> <mn>3</mn> </msub> </math></EquationSource> <EquationSource Format="TEX">\( {\mathcal{Z}}_3 \)</EquationSource> </InlineEquation> symmetry, acts as DM and couples to SM up-type quarks through a heavy Dirac vector-like quark (VLQ), which shares the same <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <msub> <mi mathvariant="script">Z</mi> <mn>3</mn> </msub> </math></EquationSource> <EquationSource Format="TEX">\( {\mathcal{Z}}_3 \)</EquationSource> </InlineEquation> charge as of the DM. The model is compatible with the observed <InlineEquation ID="IEq3"> <EquationSource Format="MATHML"><math display="inline"> <msup> <mi>D</mi> <mn>0</mn> </msup> <mo>−</mo> <msup> <mover accent="true"> <mi>D</mi> <mo stretchy="true">¯</mo> </mover> <mn>0</mn> </msup> </math></EquationSource> <EquationSource Format="TEX">\( {D}^0-{\overline{D}}^0 \)</EquationSource> </InlineEquation> mixing, top-FCNC interactions, and <i>D</i><sup>0</sup> 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.</p>

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Up-type FCNC in presence of Dark Matter

  • Subhaditya Bhattacharya,
  • Lipika Kolay,
  • Dipankar Pradhan,
  • Abhik Sarkar

摘要

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 Z 3 \( {\mathcal{Z}}_3 \) symmetry, acts as DM and couples to SM up-type quarks through a heavy Dirac vector-like quark (VLQ), which shares the same Z 3 \( {\mathcal{Z}}_3 \) charge as of the DM. The model is compatible with the observed D 0 D ¯ 0 \( {D}^0-{\overline{D}}^0 \) 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.