Complementarity of Gamma-ray and LHC Searches for Neutralino Dark Matter in the Focus Point Region

TL;DR

This paper explores how gamma-ray observations with H.E.S.S. II and supersymmetry searches at the LHC can jointly probe the Focus Point region of neutralino dark matter within the mSUGRA model, revealing complementary detection capabilities.

Contribution

It demonstrates the complementary sensitivity of gamma-ray and collider searches in the Focus Point region, highlighting regions accessible to each method despite heavy scalar particles.

Findings

H.E.S.S. II can detect gamma-ray fluxes covering a significant part of the Focus Point region.

LHC can probe parts of the region through three-body NLSP leptonic decays.

Combined, these methods enhance the overall detection prospects for neutralino dark matter.

Abstract

We study the complementarity between the indirect detection of dark matter with gamma-rays in H.E.S.S. and the supersymmetry searches with ATLAS at the Large Hadron Collider in the Focus Point region within the mSUGRA framework. The sensitivity of the central telescope of the H.E.S.S. II experiment with an energy threshold of ~ 20 GeV is investigated. We show that the detection of gamma-ray fluxes of O(10^-12) cm-2s-1 with H.E.S.S. II covers a substantial part of the Focus Point region which may be more difficult for LHC experiments. Despite the presence of multi-TeV scalars, we show that LHC will be sensitive to a complementary part of this region through three body NLSP leptonic decays. This interesting complementarity between H.E.S.S. II and LHC searches is further highlighted in terms of the gluino mass and the two lightest neutralino mass difference.