Constraining the monochromatic gamma-rays from dark matter annihilation by the LHC

Understand

The installation of forward detectors in CMS and ATLAS turn the LHC to an effective photon-photon collider.

• The elastic scattering of the beam-protons via the emission of photons, which can be identified by tagging the intact protons in the forward detectors, provides a powerful diagnostic of the central production of new particles through photon-photon annihilation.
• In this letter we study the central production of dark matter particles and the potential of LHC to constrain the cross section of this process.
• By virtue of the crossing symmetry, this limit can immediately be used to constrain the production of monochromatic gamma-rays in dark matter annihilation, a smoking gun signal under investigation in indirect dark matter searches.