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SUMMARY:Rapid bound-state formation of Dark Matter in the Early Universe
DTSTART;VALUE=DATE-TIME:20191112T064500Z
DTEND;VALUE=DATE-TIME:20191112T070500Z
DTSTAMP;VALUE=DATE-TIME:20250110T182844Z
UID:indico-contribution-1553@indico.icrr.u-tokyo.ac.jp
DESCRIPTION:Speakers: Tobias Binder ()\nThe thermal decoupling description
  of multi-TeV scale dark matter (DM) and co-annihilating partners is recon
 sidered. In such a high-mass region\, even the electroweak force carriers 
 could act as long-range forces\, leading to the existence of meta-stable D
 M bound states. The formation and subsequent decay of the latter further d
 epletes the relic density on top of the Sommerfeld enhancement\, allowing 
 for heavier DM masses. So far\, only the on-shell mediator emission (W\, Z
 \, H\, g\, photon or exotic) was considered as the formation process of th
 e bound states. In this talk\, I show that bound-state formation via bath 
 particle scattering\, i.e. the mediator instead in the t-channel and conne
 cted to the SM plasma\, can be the dominant conversion process. For a simp
 lified setup we find that bound-state formation via bath particle scatteri
 ng exceeds the single mediator bound-state formation cross-section by seve
 ral orders of magnitude at the freeze-out temperature. The implications of
  these findings are that bound-state effects become more pronounced during
  chemical decoupling and consequently DM could be heavier than previously 
 expected\, eventually informing indirect and collider searches.\n\nhttps:/
 /indico.icrr.u-tokyo.ac.jp/event/259/contributions/1553/
LOCATION:The University of Tokyo\, Kashiwa Campus
URL:https://indico.icrr.u-tokyo.ac.jp/event/259/contributions/1553/
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