Absorption of Fermionic Dark Matter in Direct Detection Experiments - PowerPoint PPT Presentation

Absorption of Fermionic Dark Matter in Direct Detection Experiments J. A. Dror, G. Elor, Robert McGehee 1905.XXXXX Phenomenology 2019, 5/6/2019

The WIMP Paradigm Fermion ~10 GeV-10 TeV Stable χ χ N N XENON Collaboration, E. Aprile et al. , “Dark Matter Search Results from a One Ton-Year Exposure of XENON1T”, Phys. Rev. Lett. 121 (2018), no. 11, 111302 Robert McGehee 1/10

The WIMP Paradigm Fermion ~10 GeV-10 TeV Stable Tongyan Lin, tomorrow! XENON Collaboration, E. Aprile et al. , “Dark Matter Search Results from a One Ton-Year Exposure of XENON1T”, Phys. Rev. Lett. 121 (2018), no. 11, 111302 Robert McGehee 2/10

The WIMP Paradigm Fermion ~10 GeV-10 TeV Stable Robert McGehee, right now! XENON Collaboration, E. Aprile et al. , “Dark Matter Search Results from a One Ton-Year Exposure of XENON1T”, Phys. Rev. Lett. 121 (2018), no. 11, 111302 Robert McGehee 2/10

The Signals 𝑓 ± χ ν χ N, 𝑓 − N, 𝑓 − N’ N 𝑓 ± ν 𝑓 ∓ χ γ ν χ Robert McGehee 3/10

DM Stability Decays are unavoidable Operators must be stable enough Easy UV completions are sufficiently stable More freedom than sterile ν Robert McGehee 4/10

The Operators 𝑓 ± χ ν χ N’ N N N Robert McGehee 5/10

The Kinematics Existing Experiments! Lighter DM! χ ν Peaked signals! Correlated signals! “Best” experiments changed relative to WIMPs N N Robert McGehee 6/10

Protophobic DM Neutral Currents Preliminary Robert McGehee 7/10

DM Enabled β ± transitions (DE β s) 𝑓 ± χ N doesn’t β ± decay High energy 𝑓 ± ! Nuclear recoil! γ from excited nucleus! N’ Decay of unstable nucleus! N Robert McGehee 8/10

Searches for DE β s Preliminary Robert McGehee 9/10

Summary Relaxing DM stability assumptions allows for novel signals and operators. Neutral current operators yield peaked, correlated nuclear recoil (NR) signals. Charged current operators yield β ± , NR, and γ signals. New searches at existing experiments can probe both neutral and charged current operators. Fermionic DM absorption is an exciting playground for both experiments and model building! Robert McGehee 10/10

Backup Slides

DM-Independent Constraints Solar cooling/SN bounds OK since our Collider constraints Beta decays ν χ N N Robert McGehee

Robert McGehee

Robert McGehee

Robert McGehee