Местоположение издательства:New York, N.Y., United States
Первая страница:S970
Последняя страница:S973
Аннотация:A self-consistent and gauge-invariant model of light dark matter coupled to the StandardModel through concurrent vector and scalar portals is developed. The framework extends the gaugegroup by an additional U(1) V symmetry featuring a kinetically mixed vector boson and a complex scalarsinglet interacting with the Higgs doublet via mixing. Effective interaction Lagrangians are derived, andthe phenomenology of the small-mixing, light-mediator regime is analyzed. √ Numerical simulations ofassociated dark matter production with a τ + τ − pair in e + e − collisions at s = 7 GeV are performed,with signal and background cross sections evaluated to obtain sensitivity contours in the [m χ , y] parameterplane. Even for sin θ ∼ 10 −4 , the scalar portal provides a non-negligible contribution, emphasizing thephenomenological relevance of the combined portal framework compared with single-vector–mediatorscenarios.
