Conveners
DM II
- Jonathan Cornell (University of Cincinnati)
We propose a new dark matter detection strategy that will enable the search of super-light dark matter $m_\chi \simeq 0.1$ keV, representing an improvement of the minimum detectable mass by more than three order of magnitude over the ongoing experiments. This is possible by integrating intimately the target material, $\pi$-bond electrons in graphene, into a Josephson junction to achieve a high...
A key strategy for the direct detection of sub-GeV dark matter is to search for small ionization signals. These can arise from dark matter-electron scattering or when the dark matter-nucleus scattering process is accompanied by a 'Migdal' electron. In this talk, I will discuss the parametric relationship between dark matter-electron scattering and the 'Migdal' ionization for noble-liquid...
For direct detection of sub-MeV dark matter, a promising strategy is to search for individual phonon excitations in a crystal. We perform an analytic calculation of the rate for light dark matter (keV < mDM < MeV) to produce two acoustic phonons through scattering in cubic crystals such as GaAs, Ge, Si and diamond. The multiphonon rate is always smaller than the rate to produce a single...
Millicharged particles (MCPs) are linked to the fundamental questions like charge quantization, and can make up a fraction of the DM abundance. The recent surge of interest of MCPs is linked to the EDGES anomaly, the excesses seen in direct-detection experiments, and the study of strongly interacting dark matter (SIDM).
In this talk, I will present the searches of MCP and millicharged SIDM...
Dark matter could have a small electromagnetic charge, provided the charge-to-mass ratio is much less than that of electrons or protons. This candidate, commonly known as millicharged dark matter (mDM), would form a plasma and interact with the interstellar medium and electromagnetic fields within galaxies. In general, understanding the dynamics of mDM requires consideration of collective...
The KOTO experiment has reported an excess of $K_L\to\pi^0\bar\nu\nu$ events above standard model expectations. New physics interpretations of an excess in this channel are constrained by the Grossman-Nir bound, but another possibility is that the observed events in fact originate from a different process entirely: a decay of the form $K_L\to\pi^0\phi$, where $\phi$ denotes one or more new...
We analyze the sensitivity of the Fermilab SeaQuest experiment to GeV-scale dark scalars and heavy neutral leptons. We consider a variety of production mechanisms, including meson decays, proton bremsstrahlung, and perturbative QCD processes, and study a variety of displaced final states signatures for these light exotic new particles.
We show that SeaQuest has the potential to probe...
Absorption of fermionic dark matter leads to a range of distinct and novel signatures at dark matter direct detection and neutrino experiments. We study the possible signals from fermionic absorption by nuclear targets, which we divide into two classes of four Fermi operators: neutral and charged current. In the neutral current signal, dark matter is absorbed by a target nucleus and a neutrino...
