The Coannihilation Codex
Michael J. Baker, Joachim Brod, Sonia El Hedri, Anna Kaminska, Joachim, Kopp, Jia Liu, Andrea Thamm, Maikel de Vries, Xiao-Ping Wang, Felix Yu,, Jos\'e Zurita

TL;DR
This paper provides a comprehensive classification of simplified dark matter coannihilation models, analyzing their interactions, phenomenology, and experimental signatures, especially at the LHC, to facilitate unified interpretation of dark matter searches.
Contribution
It introduces a systematic classification of coannihilation models based on particle quantum numbers and interactions, including new scenarios from electroweak symmetry breaking effects.
Findings
New coannihilation scenarios with unique signatures for LHC searches
Framework connecting dark matter phenomenology with collider and detection experiments
Detailed analysis of a leptoquark-mediated dark matter coannihilation model
Abstract
We present a general classification of simplified models that lead to dark matter (DM) coannihilation processes of the form DM + X SM + SM, where X is a coannihilation partner for the DM particle and SM, SM are Standard Model fields. Our classification also encompasses regular DM pair annihilation scenarios if DM and X are identical. Each coannhilation scenario motivates the introduction of a mediating particle M that can either belong to the Standard Model or be a new field, whereby the resulting interactions between the dark sector and the Standard Model are realized as tree-level and dimension-four couplings. We construct a basis of coannihilation models, classified by the quantum numbers of DM, X and M. Our main assumptions are that dark matter is an electrically neutral color singlet and that all new particles are…
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