Dear Astro-Lunchers,
Join us in ~1 hour and 15 minutes for today's astroparticle lunch! Today, we will have a talk by Tarak Nath Maity (Indian Institute of Science) on dark matter and gamma rays; and Bei Zhou will tell us about dimuon events in IceCube(https://arxiv.org/abs/2110.02974).
Join us at Price Place or over Zoom: https://osu.zoom.us/s/99484229735?pwd=a1M1bEhTM0tSTEdqcUQ4MFIrQTl2UT09 at 11:45 Eastern.
The title and abstract of Tarak's talk are below:
A search for dark matter using sub- PeV γ-rays observed by Tibet ASγ
The discovery of diffuse sub-PeV gamma-rays by the Tibet ASγ collaboration promises to revolutionize our understanding of the high-energy astrophysical universe. It has been shown that this data broadly agrees with prior theoretical expectations. In this talk, we will explore the impact of this discovery on a well-motivated new physics scenario: PeV-scale decaying dark matter (DM). Considering a wide range of final states in DM decay, a number of DM density profiles, and numerous astrophysical background models, we find that this data provides the most stringent limit on DM lifetime for various Standard Model final states. In particular, we find that the strongest constraints are derived for DM masses in between a few PeV to few tens of PeV