Displaced tracks as a signal of dark matter co-annihilation: a case study using inert doublet model at e+e- collider
Abstract
Dark sector containing heavy (charged) particles with small mass splitting with dark matter (DM) can co-annihilate and produce correct relic density, evading direct detection bounds. In such compressed spectra, the charged state can be long-lived and decay to DM along with a very soft charged particle, giving rise to distinctive disappearing or kink track signatures at colliders. As an example, we consider the Inert Doublet Model (IDM), where the charged scalar H± can be nearly degenerate with the neutral DM state (H0), and produce a soft pion (π±) when it decays. We investigate this signature at a future e+e- collider, focusing on electroweak H+H- pair production and its displaced decays. By varying the mass splitting, we explore the transition from prompt soft-particle signatures to long-lived and disappearing-track signatures. Our analysis demonstrates the potential of future lepton colliders to probe the interplay between the charged-particle lifetime, its decay probability within the tracking volume, and the production rate sensitivity to the compressed DM scenarios over a broad range of masses, allowed by cosmological constraints.
Related
- Extending the reconstruction of displaced tracks at CMS during the HL-LHC with Line Segment Tracking
- Neutrino mass, scalar dark matter, and collider signatures in a radiative doublet-triplet model
- Probing the Inert Scalar Sector of the Inert Doublet Model via Vector-Boson Fusion at a Muon Collider
- Collider and direct detection as key probes of asymmetric dark matter: Signals from a compressed Inert Higgs doublet
- Coincidence-conditioned Compton-modulation recovery from annihilation Bell pairs
BibTeX
@misc{deka2026displaced,
title = {{Displaced tracks as a signal of dark matter co-annihilation: a case study using inert doublet model at $e^+e^-$ collider}},
author = {Hrishikesh Deka and Subhaditya Bhattacharya and Amir Subba and Ritesh K. Singh},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.20444},
eprint = {2610.20444},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.20444},
note = {CC0},
}
RIS
TY - UNPB
TI - Displaced tracks as a signal of dark matter co-annihilation: a case study using inert doublet model at e^+e^- collider
AU - Hrishikesh Deka
AU - Subhaditya Bhattacharya
AU - Amir Subba
AU - Ritesh K. Singh
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.20444
UR - https://arxiv.org/abs/2610.20444
AB - Dark sector containing heavy (charged) particles with small mass splitting with dark matter (DM) can co-annihilate and produce correct relic density, evading direct detection bounds. In such compressed spectra, the charged state can be long-lived and decay to DM along with a very soft charged particle, giving rise to distinctive disappearing or kink track signatures at colliders. As an example, we consider the Inert Doublet Model (IDM), where the charged scalar H^± can be nearly degenerate with the neutral DM state (H^0), and produce a soft pion (π^±) when it decays. We investigate this signature at a future e^+e^- collider, focusing on electroweak H^+H^- pair production and its displaced decays. By varying the mass splitting, we explore the transition from prompt soft-particle signatures to long-lived and disappearing-track signatures. Our analysis demonstrates the potential of future lepton colliders to probe the interplay between the charged-particle lifetime, its decay probability within the tracking volume, and the production rate sensitivity to the compressed DM scenarios over a broad range of masses, allowed by cosmological constraints.
ER -