Spin trio: A dark matter scenario

We investigate a beyond Standard Model (SM) featuring five new fields. Four fields encompassing three distinct spin states—scalar (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>S</a:mi></a:math>), spinor (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>ψ</c:mi><c:mrow><c:mn>1</c:mn><c:mo>,</c:mo><c:mn>2</c:mn></c:mrow></c:msup></c:math>), and vector (<e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:msub><e:mi>V</e:mi><e:mi>μ</e:mi></e:msub></e:math>)—together form the multicomponent dark matter (DM), while the fifth (scalar) field (<g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mi>ϕ</g:mi></g:math>) carries a unit charge under a dark <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"><i:msub><i:mi>U</i:mi><i:mi>D</i:mi></i:msub><i:mo stretchy="false">(</i:mo><i:mn>1</i:mn><i:mo stretchy="false">)</i:mo></i:math> gauge symmetry, enabling SM-DM interactions via the Higgs portal. Although the model maintains classical scale invariance, loop effects break electroweak symmetry. The parameter space is constrained by scale invariance, DM relic density, and direct detection results. Our study aims to identify feasible model regions and evaluate detectability in future experiments. We analyze processes like DM annihilations, semiannihilations, and conversions, integrating them into Boltzmann equations to calculate DM abundances. Random parameter scans reveal regions compatible with current data, including constraints from direct detection experiments like XENONnT and PandaX-4T. Our results show the model’s viability across a broad range of DM masses.