Orateur
M.
Mathias Pierre
(LPT Orsay)
Description
We investigate a simple setup in which an excess in the di-photon invariant mass distribution
around $750$ GeV, as seen by the ATLAS and CMS collaborations, is originated
through a pair of collimated photon pairs. In this framework a scalar state
$s$ decays into two light pseudo-Goldstone bosons $a$, each of which subsequently decays into
a pair of collimated photons which are misidentified as a single photon. In a minimal context of spontaneous
symmetry breaking, we show that coupling a complex scalar field $\Phi=(s+ia)/\sqrt{2}$
to a fermionic dark matter candidate $\chi$,
also responsible for generating its mass, allows for the correct relic density in a large region of the
parameter space, while not being excluded by the direct or indirect detection experiments. Moreover,
the correct relic abundance can naturally co-exist with a relatively large width for the
resonant field $s$.
Auteur principal
M.
Mathias Pierre
(LPT Orsay)
