Placing Bounds on Dark Matter with Displaced Photons

Explaining the nature of dark matter is one of the most important challenges of this Century. The lack of signals in direct and indirect detection experiments motivate the exploration of new models capable of evading the current experimental constraints, but providing testable predictions. On the other hand, collider experiments are thoroughly exploring the existence of new long-lived particles, that is, particles beyond the Standard Model with a lifetime that is long enough such that they can travel a macroscopic distance before decaying. It is thus of interest to ask if the discovery of such a particle could provide information regarding dark matter.
 

If a neutral long-lived particle decays predominantly into photons and another stable particle, its presence can be reconstructed at the LHC in the form of displaced photons. These are recognized as such in terms of their delayed arrival time tᵧ and a non-pointing parameter |Δ zᵧ |.  In this work we present a detailed recast of a search for displaced photons in ATLAS, and show how it can be used to constrain a dark matter model in a Universe with low reheating temperature.

https://unam.zoom.us/j/84371291925?pwd=mMHwgWGPXLVvDPzGCaz3XR18mbaqDY.1

Meeting ID: 843 7129 1925
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