The 750 GeV Diphoton excess, Dark Matter and Constraints from the IceCube experiment

TL;DR

This paper explores the implications of a potential 750 GeV resonance observed at the LHC, examining its role as a dark matter portal and analyzing constraints from IceCube neutrino data, especially for scalar dark matter scenarios.

Contribution

It investigates the connection between the 750 GeV resonance, dark matter interactions, and IceCube constraints, highlighting the potential for indirect detection to surpass direct detection limits.

Findings

IceCube constraints can be stronger than direct detection for dark matter masses above a few hundred GeV.

For scalar dark matter, IceCube data restrict the DM-proton cross section near natural parameter values.

The 750 GeV resonance could serve as a portal to dark matter, with implications for future searches.

Abstract

Recent LHC data show hints of a new resonance in the diphoton distribution at an invariant mass of 750 GeV. Interestingly, this new particle might be both CP odd and play the role of a portal into the dark matter sector. Under these assumptions and motivated by the fact that the requirement of $SU(2)_L$ invariance automatically implies the coupling of this alleged new resonance to $ZZ$ and $Z\gamma$, we investigate the current and future constraints coming from the indirect searches performed through the neutrino telescope IceCube. We show that these constraints can be stronger than the ones from direct detection experiments if the dark matter mass is larger than a few hundred GeV. Furthermore, in the scenario in which the dark matter is a scalar particle, the IceCube data limit the cross section between the DM and the proton to values close to the predicted ones for natural values of the parameters.