2nd Edition of the Workshop 'Quarkonia meet Dark Matter' (QMDM)

Session

Monday - Session 2

18 Mar 2024, 10:50

Auditorium (Institute for Advanced Study, Technical University of Munich)

Conveners

Monday - Session 2

• Stefan Lederer (Technische Universität München)

79. Dark matter, bound states and unitarity

Kallia Petraki (ENS and Sorbonne University)

18/03/2024, 10:50

1. Perturbative regime: Effective field theories and precision calculations for Quarkonia and Dark Matter

If dark matter couples to force mediators that are much lighter than itself, then its interactions manifest as long-ranged. This gives rise to non-perturbative effects, including the existence of bound states. The formation of stable or metastable dark matter bound states can affect the dark matter phenomenology very significantly, including the dark matter relic density, indirect and direct...

80. The sommerfeld enhancement at NLO

salvatore bottaro (Tel Aviv University)

18/03/2024, 11:25

1. Perturbative regime: Effective field theories and precision calculations for Quarkonia and Dark Matter

We reexamine the consequences of perturbative unitarity on dark matter freeze-out when both Sommerfeld enhancement and bound state formation affect dark matter annihilations. At leading order (LO) the annihilation cross-section is infrared dominated and the connection between the unitarity bound and the upper bound on the dark matter mass depends only on how the different partial waves are...

81. Radiation back-reaction during dark-matter freeze-out via metastable bound states

CHRISTIANA vasilaki (LPENS)

18/03/2024, 11:50

1. Perturbative regime: Effective field theories and precision calculations for Quarkonia and Dark Matter

The formation and decay of metastable dark matter bound states in the early universe can deplete the dark matter abundance, thereby affecting the predicted couplings and mass. The efficacy of the effect is suppressed by the ionisation and excitations of bound states due to the ambient radiation. While existing calculations take into account the thermal radiation, the dynamics of Hydrogen...

63. Bound-state formation via fermion radiation, and implications for co-annihilation models

Divya sachdev

1. Perturbative regime: Effective field theories and precision calculations for Quarkonia and Dark Matter

In this talk, we present the role of fermions within multi-TeV colored co-annihilation scenarios. The interactions of fermions with dark matter (DM) and co-annihilating particles have the potential to introduce novel decay channels for bound states. However, we emphasize that these same interactions also provide efficient mechanisms for bound state formation (BSF), complementing the...

56. Radiation back-reaction during dark-matter freeze-out via metastable bound states

CHRISTIANA vasilaki (LPENS)

1. Perturbative regime: Effective field theories and precision calculations for Quarkonia and Dark Matter

The formation and decay of metastable dark matter bound states in the early universe can deplete the dark matter abundance, thereby affecting the predicted couplings and mass. The efficacy of the effect is suppressed by the ionisation and excitations of bound states due to the ambient radiation. While existing calculations take into account the thermal radiation, the dynamics of Hydrogen...

67. The sommerfeld enhancement at NLO

diego redigolo (INFN FLORENCE)

1. Perturbative regime: Effective field theories and precision calculations for Quarkonia and Dark Matter

We reexamine the consequences of perturbative unitarity on dark matter freeze-out when both Sommerfeld enhancement and bound state formation affect dark matter annihilations. At leading order (LO) the annihilation cross-section is infrared dominated and the connection between the unitarity bound and the upper bound on the dark matter mass depends only on how the different partial waves are...