Phenomenology 2022 Symposium: From Virtual to Real

Session

DM VI

10 May 2022, 16:30

Lawrence Hall 203

Conveners

DM VI

• Debasish Borah (Indian Institute of Technology Guwahati)

198. Secondary Tau Neutrino Probes of Heavy Dark Matter Decays

Jeffrey Hyde

10/05/2022, 16:30

Dark matter particles can be gravitationally trapped by celestial bodies, motivating searches for localized annihilation or decay. We compute the secondary tau neutrino spectrum at the surface from decays within the Earth and examine the reach of the IceCube high-energy starting event (HESE) sample in the dark matter model parameter space, using numerical simulations along with updated...

181. The Migdal Effect in the Hydrogen Molecular Ion

Ian Harris

10/05/2022, 16:45

The Migdal effect, which describes electronic transitions after nuclear scattering, has been proposed as a mechanism for direct detection of light dark matter. The Migdal effect can be understood as a first order departure from the Born-Oppenheimer approximation of factorization of electrons and nuclei, and thus molecules are an especially interesting system to study this effect. I will...

76. Measuring the Migdal Effect with Neutrons

Duncan Adams (C.N. Yang Institute of Theoretical Physics)

10/05/2022, 17:00

The Migdal Effect, in which an electron is ejected in a dark matter-nucleus scattering event, provides a powerful probe of sub-GeV dark matter. However, this effect has not yet been experimentally observed and calibrated. We have carefully analyzed the kinematics of neutron-induced Migdal scattering events and propose a detection concept for the Migdal effect that utilizes the standard...

106. Non-perturbative effects in a simplified t-channel dark matter model

Kirtimaan Ajaykant Mohan

10/05/2022, 17:15

The existence of a dark matter model with a rich dark sector could be the reason why WIMP dark matter has evaded its detection so far. For example, colored co-annihilation naturally leads to the prediction of heavier dark matter masses. Importantly, in such a scenario the Sommerfeld effect and bound state formation must be considered in order to accurately predict relic abundance. We use the...

49. Bound state effects on dark matter coannihilation - pushing the boundaries of t-channel mediator models

Jan Heisig (Université catholique de Louvain (UCL))

10/05/2022, 17:30

Bound-state formation effects can have a large impact on the dynamics of dark matter freeze-out in the early Universe, in particular, for colored coannihilators. We present a general formalism to include an arbitrary number of excitations of bound states in terms of an effective annihilation cross section. For a coannihilator in the fundamental representation of SU(3)c, we discuss radiative...

107. Higgsino Dark Matter Theory and its Experimental Probes

Benjamin Sheff

10/05/2022, 18:00

We examine a particularly compelling class of supersymmetric models with Higgsino-like thermal dark matter. In particular, this class of models has a split in energy scales between the Standard Model particles and the supersymmetric scalar masses motivated by the mass of the Higgs boson and by existing experimental bounds. While having very few input parameters, many of the supersymmetry...