Dark matter bound-state formation at higher order: a non-equilibrium quantum field theory approach
| Autor: | Kyohei Mukaida, Tobias Binder, J. Harz, Burkhard Blobel |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
High Energy Physics - Theory
Nuclear and High Energy Physics Photon Dark matter exchange [photon] collinear FOS: Physical sciences field theory 01 natural sciences dark matter Standard Model exchange [gluon] formation [bound state] High Energy Physics - Phenomenology (hep-ph) Thermal 0103 physical sciences Bound state lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ddc:530 Quantum field theory Field Theory 010306 general physics background [plasma] Boson Physics electroweak interaction 010308 nuclear & particles physics Electroweak interaction scattering temperature thermal [relic density] Cosmology of Theories beyond the SM binding energy ddc Massless particle High Energy Physics - Phenomenology massless [mediation] High Energy Physics - Theory (hep-th) Quantum electrodynamics Beyond Standard Model lcsh:QC770-798 1 [higher-order] |
| Zdroj: | Journal of High Energy Physics Journal of high energy physics 2020(9), 86 (2020). doi:10.1007/JHEP09(2020)086 Journal of High Energy Physics, Vol 2020, Iss 9, Pp 1-43 (2020) |
| DOI: | 10.3204/PUBDB-2020-01805 |
| Popis: | The formation of meta-stable dark matter bound states in coannihilating scenarios could efficiently occur through the scattering with a variety of Standard Model bath particles, where light bosons during the electroweak cross over or even massless photons and gluons are exchanged in the t-channel. The amplitudes for those higher-order processes, however, are divergent in the collinear direction of the in- and out-going bath particles if the mediator is massless. To address the issue of collinear divergences, we derive the bound-state formation collision term in the framework of non-equilibrium quantum field theory. The main result is an expression for a more general cross section, which allows to compute higher-order bound-state formation processes inside the primordial plasma background in a comprehensive manner. Based on this result, we show that next-to-leading order contributions, including the bath-particle scattering, are i) collinear finite and ii) generically dominate over the on-shell emission for temperatures larger than the absolute value of the binding energy. Based on a simplified model, we demonstrate that the impact of these new effects on the thermal relic abundance is significant enough to make it worthwhile to study more realistic coannihilation scenarios. Comment: 38 pages, 20 figures |
| Databáze: | OpenAIRE |
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