Scalar Dark Matter in light of LEP and ILC Experiments

TL;DR

This paper investigates a scalar dark matter model with ~100 MeV mass, constrains its couplings using LEP data, and assesses ILC's potential to detect it with polarized beams and different energies.

Contribution

It provides new constraints on scalar dark matter couplings from LEP and explores ILC detection prospects with polarized beams and various configurations.

Findings

Constrained chiral couplings C_L and C_R using LEP data.

Analyzed ILC's sensitivity at 500 GeV and 1 TeV energies.

Explored beam polarization effects on dark matter detection.

Abstract

In this work we study a scalar field dark matter model with mass of the order of 100 MeV. We assume dark matter is produced in the process $e^-+e^+\to \phi +\phi^*+\gamma$, that, in fact, could be a background for the standard process $e^-+e^+\to \nu +\bar\nu+\gamma$ extensively studied at LEP. We constrain the chiral couplings, $C_L$ and $C_R$, of the dark matter with electrons through an intermediate fermion of mass $m_F=100$ GeV and obtain $C_L=0.1(0.25)$ and $C_R=0.25(0.1)$ for the best fit point of our $\chi^2$ analysis. We also analyze the potential of ILC to detect this scalar dark matter for two configurations: (i) center of mass energy $\sqrt{s}=500$ GeV and luminosity $\mathcal{L}=250$ fb$^{-1}$, and (ii) center of mass energy $\sqrt{s}=1$ TeV and luminosity $\mathcal{L}=500$ fb$^{-1}$. The differences of polarized beams are also explored to better study the chiral couplings.