“School of Particles”
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| Paper IPM / Particles / 14203 |
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Assuming that the newly announced $750$ GeV diphoton excess by ATLAS and CMS is due to a decaying pseudoscalar particle,
we analyze the singlet fermionic dark matter scenario with the pseudoscalar playing the role of the mediator.
The dark sector connects to the standard model sector through the Higgs portal and effective operators of
gluons and photons. We show that there is a range of dark matter masses within $\sim 88-280$ GeV that beside giving
the correct relic density provided by Planck, matches also with the total decay width of $25-45$ GeV
measured by ATLAS. Due to the presence of the pseudoscalar mediator, the DM-nucleon cross section is velocity suppressed so that the model evades
easily the bounds put by even future direct detection experiments such as XENON1T
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