[HET seminar] Dark matter direct detection from single phonons to nuclear recoils

by Tongyan Lin (UC San Diego)

Thursday 9 Feb 2023, 11:00 → 12:30 US/Eastern

https://bnl.zoomgov.com/j/1605999124?pwd=eCs3M0t2eGtiL0dyMGNoUDIzamxqQT09

Also in small seminar room.

Abstract: In most direct detection experiments, the free nuclear recoil description of dark matter scattering breaks down for masses ≲ 100 MeV, or when the recoil energy is comparable to a few times the typical phonon energy. In this talk, I will discuss the dark matter phonon scattering processes that are relevant for this low-mass regime. For dark matter lighter than 1 MeV, scattering via excitation of a single phonon dominates and is now well-studied. For the intermediate mass range of 1- 100 MeV, multiphonon processes dominate and are challenging to compute. I will present an analytic description of dark matter scattering that connects the single phonon, multiphonon, and the nuclear recoil regimes, and summarize results for dark matter scattering in the entire keV-GeV mass range.

2023_02_Brookhaven.pdf