Impact of bound states on non-thermal dark matter production. (arXiv:2112.01491v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Bollig_J/0/1/0/all/0/1">Julian Bollig</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Vogl_S/0/1/0/all/0/1">Stefan Vogl</a>

We explore the impact of non-perturbative effects, namely Sommerfeld
enhancement and bound state formation, on the cosmological production of
non-thermal dark matter. For this purpose, we focus on a class of simplified
models with t-channel mediators. These naturally combine the requirements for
large corrections in the early Universe, i.e. beyond the Standard Model states
with long range interactions, with a sizable new physics production cross
section at the LHC. We find that the dark matter yield of the superWIMP
mechanism is suppressed considerably due to the non-perturbative effects under
consideration. This leads to a significant shift in the cosmologically
preferred parameter space of non-thermal dark matter in these models. We also
revisit the implications of LHC bounds on long-lived particles associated with
non-thermal dark matter and find that testing this scenario at the LHC is a
bigger challenge than previously anticipated.

We explore the impact of non-perturbative effects, namely Sommerfeld
enhancement and bound state formation, on the cosmological production of
non-thermal dark matter. For this purpose, we focus on a class of simplified
models with t-channel mediators. These naturally combine the requirements for
large corrections in the early Universe, i.e. beyond the Standard Model states
with long range interactions, with a sizable new physics production cross
section at the LHC. We find that the dark matter yield of the superWIMP
mechanism is suppressed considerably due to the non-perturbative effects under
consideration. This leads to a significant shift in the cosmologically
preferred parameter space of non-thermal dark matter in these models. We also
revisit the implications of LHC bounds on long-lived particles associated with
non-thermal dark matter and find that testing this scenario at the LHC is a
bigger challenge than previously anticipated.

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