On direct search for dark matter in scattering processes within Yukawa model

TL;DR

This paper investigates why dark matter particles might evade detection in collider experiments by analyzing their resonance properties within a generalized Yukawa model, especially when their widths are large and the narrow width approximation fails.

Contribution

It provides new insights into the properties of dark matter candidates when their resonance widths exceed experimental expectations, challenging the applicability of the narrow width approximation.

Findings

Identifies parameter regions where the NWA is invalid for dark matter resonances.

Estimates the width thresholds beyond which dark matter signals may be missed as noise.

Analyzes the impact of couplings and mass parameters on dark matter detection prospects.

Abstract

\begin{abstract} Nowadays, no dark matter candidates have been discovered. We consider two possible reasons for that, both related to the approach of on-peak resonance searching for. As is believed usually, a new particle suits the conditions that the ratio of the width to the mass is less than $1-3 \%$ and a narrow width approximation (NWA) is applicable to identify the such type resonant peak in the invariant mass spectrum of collision products. In the present paper, in the framework of generalized Yukawa model, we find out the properties of the searched particle when its width is larger than a maximal one expected during experiments and so this state could be missed as a noise. We also ascertain the values of particle's parameters when the NWA is not applicable and estimate the width value when it happens. These estimations are relevant to interactions between the Standard model and dark matter particles. Such approach is focused on the role of couplings and mass values introduced in the model describing interaction of visible and dark matter. Key words: dark matter; resonance; narrow width approximation; mixing of fields.