15-18 June 2021
Kavli IPMU, Kashiwa, Japan
Asia/Tokyo timezone

Dark matter and coloured co-annihilators: from the relic density to experimental constraints

17 Jun 2021, 20:00
Remote access (Kavli IPMU, Kashiwa, Japan)

Remote access

Kavli IPMU, Kashiwa, Japan

Kashiwa, Japan


Simone Biondini


In order to compute accurately the relic energy density of dark matter particles featuring co-annihilating partners, it is important to address the annihilations of the latter if the mass splitting is small. Coloured co-annihilators participating QCD interactions offer a rich phenomenology, and their dynamics in the early universe resembles that of heavy quarks in a quark-gluon plasma. Making contact with modern EFTs, we recast the thermal annihilation cross sections in terms of expectation values of 4-particle operators in NREFTs, the determination of which requires thermal potentials derived within pNRQCD. Experimental constraints on the parameter space compatible with the observed energy density are also discussed.

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