[Triumf-seminars] TRIUMF Theory Seminar today at 13:00

TRIUMF Seminars triumf-seminars at lists.triumf.ca
Tue Nov 4 05:00:02 PST 2014


Date/Time: Tue 2014-11-04 at 13:00

Location:  Theory Room         

Speaker:   Yuhsin Tsai (UC Davis)

Title:     Galactic Center Excess through a Hidden Valley Shower

Abstract: The gamma ray excess from the galactic center has drawn a lot of attention. A simple DM scenario, 
the hooperon, provides a plausible explanation to the excess. However, the typical story with DM particle annihilating into the SM quarks and leptons is now facing challenges from various experimental constraints. Since the annihilation also involve the secondary emission of cosmic rays, searches for anti-proton or positron has set strong constraints to the general model. This then motivates the study of simple variations of the model that can decouple such constraints. In this talk, I will present a "dark-sudakov" model, in which the sudakov-like spectrum of the observed gamma ray does not come from the SM showering but is instead generated in a dark sector. The setup significantly weakens various experimental constraints, and the dominant constraints come from the thermal history and stellar cooling, which will also be discussed in the talk.




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